\nExample : Amoeba, paramecium<\/td>\n
\nExample: Malarial parasite.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Question 2
\nHow will an organism be benefited if it reproduces through spores ?<\/h2>\nAnswer:
\nAn organism is benefited by reproducing through the spores because spores are surrounded by a thick layer which protects them in adverse conditions. When the favourable conditions occur, these spores start to grow again. In this way they are successfully live in unfavourable conditions.<\/h3>\nQuestion 3
\nCan you think of reasons why more complex organisms cannot give rise to new individuals through regeneration ?<\/h2>\nAnswer:
\nIn complex multicellular organisms, specialised cells make up tissues, tissue make up organs, organs make up organ systems and finally organ systems make up organisms. Since complex multicellular organisms have a very high degree of organisation in their body, they cannot be reproduced from their cut body parts by the process of regeneration.
\nFor example, a dog is a complex multicellular organism which cannot be regenerated from its cut body part say, a cut tail. This is because the cells present in the cut tail of a dog cannot produce dog\u2019s organs like heart brain, lungs, stomach, intestines and limbs, etc, needed for the making of a complete dog.<\/h3>\nQuestion 4
\nWhy is vegetative propagation practised for growing some types of plants ?<\/h2>\nAnswer:
\nVegetative propagation is practiced for growing such plants which usually do not produce seeds or produce non-viable seeds.<\/h3>\nQuestion 5
\nWhy is DNA copying an essential part of the process of reproduction ?<\/h2>\nAnswer:
\nDNA copying is essential part of the process of reproduction so that the characteristics of the parent organisms are transmitted to its offspring and at the same time some occasional variations are also produced in the offspring. The changes in the copy of DNA provide an organism the capability to survive in changing conditions.<\/h3>\nQuestion 1
\nHow is the process of pollination different from fertilisation ?<\/h2>\nAnswer:<\/h3>\n
\nAn organism is benefited by reproducing through the spores because spores are surrounded by a thick layer which protects them in adverse conditions. When the favourable conditions occur, these spores start to grow again. In this way they are successfully live in unfavourable conditions.<\/h3>\n
Question 3
\nCan you think of reasons why more complex organisms cannot give rise to new individuals through regeneration ?<\/h2>\nAnswer:
\nIn complex multicellular organisms, specialised cells make up tissues, tissue make up organs, organs make up organ systems and finally organ systems make up organisms. Since complex multicellular organisms have a very high degree of organisation in their body, they cannot be reproduced from their cut body parts by the process of regeneration.
\nFor example, a dog is a complex multicellular organism which cannot be regenerated from its cut body part say, a cut tail. This is because the cells present in the cut tail of a dog cannot produce dog\u2019s organs like heart brain, lungs, stomach, intestines and limbs, etc, needed for the making of a complete dog.<\/h3>\nQuestion 4
\nWhy is vegetative propagation practised for growing some types of plants ?<\/h2>\nAnswer:
\nVegetative propagation is practiced for growing such plants which usually do not produce seeds or produce non-viable seeds.<\/h3>\nQuestion 5
\nWhy is DNA copying an essential part of the process of reproduction ?<\/h2>\nAnswer:
\nDNA copying is essential part of the process of reproduction so that the characteristics of the parent organisms are transmitted to its offspring and at the same time some occasional variations are also produced in the offspring. The changes in the copy of DNA provide an organism the capability to survive in changing conditions.<\/h3>\nQuestion 1
\nHow is the process of pollination different from fertilisation ?<\/h2>\nAnswer:<\/h3>\n
\nIn complex multicellular organisms, specialised cells make up tissues, tissue make up organs, organs make up organ systems and finally organ systems make up organisms. Since complex multicellular organisms have a very high degree of organisation in their body, they cannot be reproduced from their cut body parts by the process of regeneration.
\nFor example, a dog is a complex multicellular organism which cannot be regenerated from its cut body part say, a cut tail. This is because the cells present in the cut tail of a dog cannot produce dog\u2019s organs like heart brain, lungs, stomach, intestines and limbs, etc, needed for the making of a complete dog.<\/h3>\n
Question 4
\nWhy is vegetative propagation practised for growing some types of plants ?<\/h2>\nAnswer:
\nVegetative propagation is practiced for growing such plants which usually do not produce seeds or produce non-viable seeds.<\/h3>\nQuestion 5
\nWhy is DNA copying an essential part of the process of reproduction ?<\/h2>\nAnswer:
\nDNA copying is essential part of the process of reproduction so that the characteristics of the parent organisms are transmitted to its offspring and at the same time some occasional variations are also produced in the offspring. The changes in the copy of DNA provide an organism the capability to survive in changing conditions.<\/h3>\nQuestion 1
\nHow is the process of pollination different from fertilisation ?<\/h2>\nAnswer:<\/h3>\n
\nVegetative propagation is practiced for growing such plants which usually do not produce seeds or produce non-viable seeds.<\/h3>\n
Question 5
\nWhy is DNA copying an essential part of the process of reproduction ?<\/h2>\nAnswer:
\nDNA copying is essential part of the process of reproduction so that the characteristics of the parent organisms are transmitted to its offspring and at the same time some occasional variations are also produced in the offspring. The changes in the copy of DNA provide an organism the capability to survive in changing conditions.<\/h3>\nQuestion 1
\nHow is the process of pollination different from fertilisation ?<\/h2>\nAnswer:<\/h3>\n
\nDNA copying is essential part of the process of reproduction so that the characteristics of the parent organisms are transmitted to its offspring and at the same time some occasional variations are also produced in the offspring. The changes in the copy of DNA provide an organism the capability to survive in changing conditions.<\/h3>\n
Question 1
\nHow is the process of pollination different from fertilisation ?<\/h2>\nAnswer:<\/h3>\n
Pollination<\/strong><\/td>\n| Fertilisation<\/strong><\/td>\n<\/tr>\n | 1. The transfer of pollen grains from the anther of a stamen to the stigma of a carpel is called pollination.<\/td>\n | 1. Fertilisation occurs when the male gamete present in pollen grain joins with the female gamete (or egg) present in ovule.<\/td>\n<\/tr>\n | 2. It takes place by various pollinating agents.<\/td>\n | 2. It takes place by natural or artificial means.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n | Question 2\n(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel. \n(ii) This fluid protects the sperms from the acids present in the urethra. \n(iii) This fluid provides nutrition to sperms in the form of fructose, calcium and some enzymes.<\/h3>\n Question 3\nThe various changes occur in girls at puberty are : \n1. Hair grow under armpits and pubic region. \n2. Mammary glands (or breasts) develop and enlarge. \n3. The hips broaden. \n4. Extra fat is deposited in various parts of the body like hips and thighs. \n5. Fallopian tube, uterus and vagina enlarge. \n6. Ovaries start to release eggs. \n7. Menstruation (monthly periods) starts. \n8. Feelings and sexual drives associated with adulthood begin to develop.<\/h3>\n Question 4\nIn mother\u2019s body, the embryo gets nutrition from the mother\u2019s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother\u2019s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substances from the mother to the embryo.<\/h3>\n Question 5\nCopper-T is a contraceptive method which prevents implantation of the zygote inside the uterus. It cannot prevent a women from sexually transmitted diseases. These diseases are transmitted by contact which cannot be prevented by copper-T.<\/h3>\n Question 1\n(b) Yeast<\/h3>\n Question 2\n(c) Vas deferens<\/h3>\n Question 3\n(d) Pollen grains<\/h3>\n Question 4\n(i) In asexual reproduction, the offspring are almost identical to their parent because they have the same genes as their parent. So, much genetic variation is not possible in asexual reproduction. This is a disadvantage because it inhibits the further evolution of the organism. \n(ii) In sexual reproduction the offspring, although similar to their parents, are not identical to them or to one another. This is because the offspring receive some genes from the mother and some from the father. Because of the mixing of genes of mother and father in various different combinations, all of the offspring have genetic variations. In this way, sexual reproduction leads to a greater variety in population. This means that a species (animal or plant) can adapt quickly to changes in its surroundings. This is because there are always likely to be some individuals which are more suited to the changes than others, and these individuals will survive and reproduce themselves.<\/h3>\n Question 5\nThe functions of testes in humans are following : \n(i) After the stage of adolescent, testes produce male gametes in the human males which are called sperms. \n(ii) A hormone called testosterone is produced in testes. Testosterone controls the development of reproductive organs and secondary sexual characters.<\/h3>\n Question 6\nIf the ovum (or egg) does not get fertilised (due to non-availability of sperm in the female body) then the thick and soft inner lining of uterus is no longer needed and hence it breaks. So, the thick and soft inner lining of uterus alongwith the blood vessels and the dead ovum (or egg) comes out of the vagina in the form of blood called menstruation. Menstruation occurs after the interval of every 28 days and the time period between ovulation and menstruation is about 14 days.<\/h3>\n Question 7
\nThe different methods of contraception are as follow : \n(i) Barrier method : In this method, condom, diaphragm and cervical caps are used. These prevent the entry of sperms in the female genital tract during sexual intercourse. \n(ii) Chemical method : In this method a woman uses two kinds of pills (oral and vaginal pills). The oral pills are hormonal preparations which suppress the release of ovum in fallopian tube. These are called oral contraceptives. The vaginal pills\/ creams are spermicidal. The chemicals in these spermicidals kill the sperms during their journey in the vaginal tract. \n(iii) Intrauterine contraceptive devices : Intrauterine contraceptive devices such as copper-T are placed safely in the uterus by a skilled doctor. It prevents the sperms to reach the uterus. \n(iv) Surgical method : In this method, a small part of vas deferens of male and fallopian tube of female is cut or tied by surgery. It is called vasectomy in males and tubectomy in females.<\/h3>\n Question 9 |
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| Reproduction mode in unicellular organisms<\/td>\n | Reproduction mode in multicellular organisms<\/td>\n<\/tr>\n |
| (i) A sexual reproduction takes place in unicellular organisms.<\/td>\n | (i) Sexual reproduction takes place in multicellular organisms.<\/td>\n<\/tr>\n |
| (ii) Only one organism is required in this method.<\/td>\n | (ii) A male and a female both are required in this method.<\/td>\n<\/tr>\n |
| (iii) No special cells are present for reproduction.<\/td>\n | (iii) Special cells are present for reproduction.<\/td>\n<\/tr>\n |
| (iv) No special organs are present for reproduction.<\/td>\n | (iv) Special organs are present for reproduction located at the fixed position in the body.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nQuestion 10\nThe introduction of variations during reproduction provides stability to the populations of various species by preventing them from getting wiped out during adverse conditions. Reproduction also helps to generate copies of individuals which are suited to a particular environment.<\/h3>\n Question 11\nThe reasons for adopting contraceptive devices are as follow: \n1. To control the birth rate and prevent the increase in population. \n2. To reduce the adverse effects on mother\u2019s body due to frequent pregnancy. \n3. To provide safety from sexually transmitted diseases.<\/h3>\n Question 1.\nDNA copying in reproduction is important for maintenance of body designs and features. Moreover, DNA copying leads to variations. Variation is useful for the survival of species.<\/h3>\n Question 2.\nPopulation of organisms reside in well-defined places or niches in the ecosystem. However, niches can change because of reasons beyond the control of the organisms, e.g., temperature changes, water level changes, etc. If population of reproducing organisms suited to particular niche and if the niche is drastically altered, the population can be wiped out. However, if some variations are present in a few inAividuals in these populations, there will be chances for their survival. The surviving individual can further reproduce and develop a population according to the changed niche, Thus, variation is beneficial to the species but not necessarily for the individual.<\/h3>\n Question 1.\nWhen two new daughter cells are formed as a result of fission. It is called binary fission, e.g., Amoeba.When many daughter cells are formed as a result of fission, this is called multiple fission, e.g., Malarial parasite.<\/h3>\n Question 2.\nSpore formation is an asexual mode of reproduction. Spores formed are covered by \nthick walls that protect them from adverse conditions. During favourable condition thick resistant wall breaks down and new organism grows from it. \nSpores are very light weight and they easily get dispersed through winds which give them more variations and thus better chances of survival.<\/h3>\n Question 3.\nComplex organisms are not simply a random collection of cells where sPecialized cells are organised as tissues, and tissues ale organised into organs which then have to be placed at definite positions in the body. In such a carefully organised situation, it is not easy to develoP organism through regeneration<\/h3>\n Question 4.\nVegetative propagation makes possible for the propagation of plants such as banana, orange, rose and jasmine that have lo6t the capacity to Produce seeds. Moreover, all plants produced through vegetative propagation are genetically similar to the parent plant.<\/h3>\n Question 5.\nThe process of reproduction results in the production of off springs which resemble to their parents. This means during the reproduction there must be a transfer of the blueprint of the body design from parent to the off springs. As we know DNA contains all the information that passes from parents to the next generation, so before reproduction, DNA is copied in the parent cell. Out of these two copies, one copy is passed to the newly formed individual.<\/h3>\n Question 1.\nPollination is the transfer of pollen grains from the anther to the stigma Of a flower whereas fertilization is the fusion Of male gamete with female gamete (egg).<\/h3>\n Question 2.\nSeminal vesicles and the prostate gland add their secretions so that the sperms are in a fluid (semen) which makes their transport easier and this fluid also provides nutrition.<\/h3>\n Question 3.\nChanges seen in girls at the time of puberty are : \n1. Breast size begins to increase. \n2. Girls begin to menstruate. \n3.Growth Of pubic hair. \n4.Skin becomes oily.<\/h3>\n Question 4.\nembryo gets nutrition from mother\u2019s blood with the help Of a special tissue called placenta. Through placenta, glucose and oxygen pass from mother to the embryo. Moreover, waste substance of embryo are removed through placenta into the \nmother\u2019s blood.<\/h3>\n Question 5.\nNo, copper-Twill not protect her from Only Barrier methods protect from sexually transmitted diseases.<\/h3>\n Question 1.\n(b) Yeast.<\/h3>\n Question 2.\n(c) Vas deferens.<\/h3>\n Question 3.\n(d) Pollen grains<\/h3>\n Question 4.\nSexual reproduction leads to new combination Of genes as it involves two parents and meiosis. This produces variation in offspring. Variations are the basis for evolution.<\/h3>\n Question 5.\nFunctions Of testes are . \n(i) Testes produce sperms. \n(ii) Testosterone (male sex hormone) is also produced by testes.<\/h3>\n Question 6.\nIf the egg is not fertilized and uterus does not get zygote, the developed lining slowly breaks and menstruation occur.<\/h3>\n Question 7.\nThere are three main methods of contraception : \n1. Barrier methods, \n2. Chemical methods, and \n3. Surgical methods. \n1. Barrier methods: In barrier methods, physical devices such as condom, diaphragm and cervical caps are used. They prevent the entry Of sperms in the female genital tract during copulation. \n2. Chemical methods: The chemical methods make use of specific drugs by females. There are two types of such drugs, Oral pills and vaginal pills. Oral pills are mainly hormonal preparation, and are called oral contraceptives (OCS). \n3. Surgical methods: In the surgical methods, a small portion of vas deferens in male, and the fallopian tube in female, in surgically removed or ligated (tied). It is called vasectomy in males and tubectomy in females. \nApart from these three methods the intrauterine contraceptive devices are used to prevent pregnancies. The use of Intra Uterine Contraceptive Devices (IUCDs) is also very effective and popular. A copper-T is placed safely inside the uterus by a practising doctor or a skilled nurse. IUCDs prevent implantation in the uterus.<\/h3>\n Question 8.\nUnicellular organisms reproduce asexually whereas multicellular organisms reproduce manly by n 1 reproduction.<\/h3>\n Question 9.\nThe rate Of birth and death in a given population determine its stability. The rate of birth should be approximately equal to the rate of death. So, by checking birth rate, which is increasing at an alarming rate, stability to population of species can be provided<\/h3>\n Question 10.\nFrequent pregnancies have an adverse effect on the health of a woman. Frequent and unwanted pregnancies can be avoided by adopting contraceptive methods. Also, these methods check population growth by controlling child birth rate.<\/h3>\n Question 1.\n(b) Asexual reproduction in Hydra and yeast takes place by budding.<\/h3>\n Question 2.\n(d) Multiple fission Organisms divide into many daughter cells simultaneously, e.g. Plasmodium.<\/h3>\n Question 3.\n(d) Anther is the male reproductive part in plants. It contains pollen grains, having male germ cells.<\/h3>\n Question 4.\n(c) In sexual reproduction, the offsprings are not exactly identical to the parents or to one another. This is because the offsprings receive some genes from mother and some from father. Because of mixing of genes on re-establishment of the exact number of chromosomes as in the parents, the offsprings show both similarities and variations with their parents.<\/h3>\n Question 5.\n(b) The diseases, which are spread by sexual contact with an infected person are called Sexually Transmitted Diseases or STDs, e.g. gonorrhoea, syphilis and AIDS. Hepatitis is a water borne viral disease which affects liver.<\/h3>\n Question 6.\n(c) Vas deferens is a part of male reproductive system in humans.<\/h3>\n Question 7.\n(a) Amoeba and yeast are unicellular while Spirogyra is multicellular. But, all the three reproduce asexualiy.<\/h3>\n Question 8.\n(b) The flowers which are unisexual (papaya, watermelon) contain either stamens or carpels. Since, only one reproductive organ is present in them, they depend on cross-pollination to form zygote after fertilisation. Both stamens and carpels are required for fertilisation, so only one of them cannot produce fruits.<\/h3>\n Question 9.\n(b) Length of pollen tube depends on the distance between pollen grain on upper surface of stigma and ovule. A pollen grain falls on the stigma of the carpel, bursts open and develops a pollen tube downwards through the style towards the ovule in the ovary.<\/h3>\n Question 10.\n(c) Sexual reproduction creates variation in organisms, so, clones cannot be produced through it. Clones are identical copy of parent organism. Sexual reproduction needs two type of gametes, i.e. male and female to form zygote after fertilisation.<\/h3>\n Question 11.\n(c) Under favourable Conditions (like damp and warm conditions, availability of nutrients), the fungal spores present in the air, lands on food, germinate and produce new plaints.<\/h3>\n Question 12.\n(c) Hypertrophy of larynx results in low pitched. cracking voice in human males during adolescence.<\/h3>\n Question 13. |
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\nWhat happens after the above stage?
\n(a) The ovary splits open
\n(b) Ovary develops into a fruit and ovules into seeds
\n(c) The pvules are dispersed
\n(d) Germination of seeds takes place<\/h2>\n
Answer:
\n(b) Ovary develops into a fruit and ovulesdnto seeds as in the above given diagram fertilisation has already taken place.<\/h3>\nQuestion 14.
\nWhat in your opinion could be the best reason to explain why menstruation is not taking place in a healthy woman?
\n(a) Early release of ovum
\n(b) Psychological reason
\n(c) Fertilisation of ovum
\n(d) Build up of female sex hormones in the blood stream<\/h2>\nAnswer:
\n(c) If a woman is not having her menstruation on time the probable reason from the given option is that fertilisation of ovum has taken place. Because, during gestation period of pregnancy, menstruation does not take place.<\/h3>\nQuestion 15.
\nThe correct sequence of reproductive stages seen in flowering plants is
\n(a) gametes, zygote, embryo, seedling
\n(b) zygote, gametes, embryo, seedling
\n(c) seedling, embryo, zygote, gametes
\n(d) gametes, embryo, zygote, seedling<\/h2>\nAnswer:
\n(a) Correct sequence of reproductive stages in flowering plants is \u2192 formation of gametes \u2192 fusion of gametes to form zygote \u2192 zygote develops into embryo in the ovary \u2192 ovule develops a tough coat and converts into a seed.<\/h3>\nQuestion 16.
\nOffsprings formed by asexual method of reproduction have greater similarity among themselves because
\nI. asexual reproduction involves only one parent.
\nII. asexual reproduction does not involve gametes.
\nIII. asexual reproduction occurs before sexual reproduction.
\nIV. asexual reproduction occurs after sexual reproduction.
\n(a) I and II
\n(b) I and III
\n(c) II and IV
\n(d) III and IV<\/h2>\nAnswer:
\n(a) Offsprings have greater similarity as only one parent is involved in asexual reproduction thus, no gametes are formed.<\/h3>\nQuestion 17.
\nTwo flowers are identified by a botanist with the following features that flower A is having only stamen and flower B is having both stamen and pistil. Which of the following statements is correct?
\n(a) Flower A will bear seeds and flower B cannot bear seeds after fertilisation.
\n(b) Flower A will produce pollen grains and flower B cannot produce pollen grains.
\n(c) Flower A cannot be fertilised and flower B can show fertilisation.
\n(d) Neither flower A and nor flower B can show self-pollination.<\/h2>\nAnswer:
\nOption (c) is correct. Since, flower A bears only stamen, i.e. male reproductive part so, it cannot get fertilised. And flower B bears both male and female reproductive parts, therefore it can get fertilised by pollination and can change into fruit.<\/h3>\n","protected":false},"excerpt":{"rendered":"
\nWhat in your opinion could be the best reason to explain why menstruation is not taking place in a healthy woman?
\n(a) Early release of ovum
\n(b) Psychological reason
\n(c) Fertilisation of ovum
\n(d) Build up of female sex hormones in the blood stream<\/h2>\n
Answer:
\n(c) If a woman is not having her menstruation on time the probable reason from the given option is that fertilisation of ovum has taken place. Because, during gestation period of pregnancy, menstruation does not take place.<\/h3>\nQuestion 15.
\nThe correct sequence of reproductive stages seen in flowering plants is
\n(a) gametes, zygote, embryo, seedling
\n(b) zygote, gametes, embryo, seedling
\n(c) seedling, embryo, zygote, gametes
\n(d) gametes, embryo, zygote, seedling<\/h2>\nAnswer:
\n(a) Correct sequence of reproductive stages in flowering plants is \u2192 formation of gametes \u2192 fusion of gametes to form zygote \u2192 zygote develops into embryo in the ovary \u2192 ovule develops a tough coat and converts into a seed.<\/h3>\nQuestion 16.
\nOffsprings formed by asexual method of reproduction have greater similarity among themselves because
\nI. asexual reproduction involves only one parent.
\nII. asexual reproduction does not involve gametes.
\nIII. asexual reproduction occurs before sexual reproduction.
\nIV. asexual reproduction occurs after sexual reproduction.
\n(a) I and II
\n(b) I and III
\n(c) II and IV
\n(d) III and IV<\/h2>\nAnswer:
\n(a) Offsprings have greater similarity as only one parent is involved in asexual reproduction thus, no gametes are formed.<\/h3>\nQuestion 17.
\nTwo flowers are identified by a botanist with the following features that flower A is having only stamen and flower B is having both stamen and pistil. Which of the following statements is correct?
\n(a) Flower A will bear seeds and flower B cannot bear seeds after fertilisation.
\n(b) Flower A will produce pollen grains and flower B cannot produce pollen grains.
\n(c) Flower A cannot be fertilised and flower B can show fertilisation.
\n(d) Neither flower A and nor flower B can show self-pollination.<\/h2>\nAnswer:
\nOption (c) is correct. Since, flower A bears only stamen, i.e. male reproductive part so, it cannot get fertilised. And flower B bears both male and female reproductive parts, therefore it can get fertilised by pollination and can change into fruit.<\/h3>\n","protected":false},"excerpt":{"rendered":"
\nThe correct sequence of reproductive stages seen in flowering plants is
\n(a) gametes, zygote, embryo, seedling
\n(b) zygote, gametes, embryo, seedling
\n(c) seedling, embryo, zygote, gametes
\n(d) gametes, embryo, zygote, seedling<\/h2>\n
Answer:
\n(a) Correct sequence of reproductive stages in flowering plants is \u2192 formation of gametes \u2192 fusion of gametes to form zygote \u2192 zygote develops into embryo in the ovary \u2192 ovule develops a tough coat and converts into a seed.<\/h3>\nQuestion 16.
\nOffsprings formed by asexual method of reproduction have greater similarity among themselves because
\nI. asexual reproduction involves only one parent.
\nII. asexual reproduction does not involve gametes.
\nIII. asexual reproduction occurs before sexual reproduction.
\nIV. asexual reproduction occurs after sexual reproduction.
\n(a) I and II
\n(b) I and III
\n(c) II and IV
\n(d) III and IV<\/h2>\nAnswer:
\n(a) Offsprings have greater similarity as only one parent is involved in asexual reproduction thus, no gametes are formed.<\/h3>\nQuestion 17.
\nTwo flowers are identified by a botanist with the following features that flower A is having only stamen and flower B is having both stamen and pistil. Which of the following statements is correct?
\n(a) Flower A will bear seeds and flower B cannot bear seeds after fertilisation.
\n(b) Flower A will produce pollen grains and flower B cannot produce pollen grains.
\n(c) Flower A cannot be fertilised and flower B can show fertilisation.
\n(d) Neither flower A and nor flower B can show self-pollination.<\/h2>\nAnswer:
\nOption (c) is correct. Since, flower A bears only stamen, i.e. male reproductive part so, it cannot get fertilised. And flower B bears both male and female reproductive parts, therefore it can get fertilised by pollination and can change into fruit.<\/h3>\n","protected":false},"excerpt":{"rendered":"
\nOffsprings formed by asexual method of reproduction have greater similarity among themselves because
\nI. asexual reproduction involves only one parent.
\nII. asexual reproduction does not involve gametes.
\nIII. asexual reproduction occurs before sexual reproduction.
\nIV. asexual reproduction occurs after sexual reproduction.
\n(a) I and II
\n(b) I and III
\n(c) II and IV
\n(d) III and IV<\/h2>\n
Answer:
\n(a) Offsprings have greater similarity as only one parent is involved in asexual reproduction thus, no gametes are formed.<\/h3>\nQuestion 17.
\nTwo flowers are identified by a botanist with the following features that flower A is having only stamen and flower B is having both stamen and pistil. Which of the following statements is correct?
\n(a) Flower A will bear seeds and flower B cannot bear seeds after fertilisation.
\n(b) Flower A will produce pollen grains and flower B cannot produce pollen grains.
\n(c) Flower A cannot be fertilised and flower B can show fertilisation.
\n(d) Neither flower A and nor flower B can show self-pollination.<\/h2>\nAnswer:
\nOption (c) is correct. Since, flower A bears only stamen, i.e. male reproductive part so, it cannot get fertilised. And flower B bears both male and female reproductive parts, therefore it can get fertilised by pollination and can change into fruit.<\/h3>\n","protected":false},"excerpt":{"rendered":"
\nTwo flowers are identified by a botanist with the following features that flower A is having only stamen and flower B is having both stamen and pistil. Which of the following statements is correct?
\n(a) Flower A will bear seeds and flower B cannot bear seeds after fertilisation.
\n(b) Flower A will produce pollen grains and flower B cannot produce pollen grains.
\n(c) Flower A cannot be fertilised and flower B can show fertilisation.
\n(d) Neither flower A and nor flower B can show self-pollination.<\/h2>\n