Biology (Class 12) Term 2 Question Paper 2023
SECTION-A
1. At which stage during evolution did human use hides to protect their bodies 1 and buried their dead?
(a) Homo habilis
(b) Neanderthal man
(c) Java man
(d) Homo erectus
2. Given below are Column A with a list of certain Assisted Reproductive 2. Technologies (ART) and in Column B the procedures followed during ART:
Column A | Column B | ||
S. No. | Names of ART | S. No. | Procedures |
(A) | GIFT | (i) | Transfer of ovum from a donor into the (A) GIFT fallopian tube of another female. |
(B) | ICSI | (ii) | Transfer of semen from the donor into the vagina of the female. |
(C) | ZIFT | (iii) | Injecting sperms directly into the ovum. |
(D) | IUI | (iv) | Transfer of early embryos into the fallopian tube. |
Choose the option where ART correctly matches with the procedure.
(a) | (A)- (i), | (B)-(i), | (C)-(iii), | (D)- (iv) |
(b) | (A)- (iv), | (B)- (i), | (C)- (ii), | (D)- (iii) |
(c) | (A)- (iv), | (B)- (ii), | (C)- (i), | (D)- (ii) |
(d) | (A)- (i), | (B)- (ii), | (C)- (iv), | (D)- (ii) |
3. The decrease in the T lymphocytes count in human blood will result in:
(a) Decrease in antigens
(b) Decrease in antibodies
(c) Increase in antibodies
(d) Increase in antigens
8. Given below is the restriction site of a restriction endonuclease Pst-I and the cleavage sites on a DNA molecule.
5’C-T-G-C-A G 3′
3′ G A-C-G-T-c5
Choose the option that gives the correct resultant fragments by the action of the enzyme Pst-I.
9. The IUCN Red Data List (2004) in the last 500 years documents the 9. 1 extinction of nearly 784 species including:
(a) 330 invertebrates
(b) 338 invertebrates 14
(c) 359 invertebrates
(d) 362 invertebrates
10. Given below are the list of the commercially important products and their source organisms. Select the option that gives the correct matches.
List A | List B | ||
S. No. | Bioactive Products | S. No. | Microbes (Source Organism) |
(A) | Cyclosporin A | (i) | Streptococcus |
(B) | Statins | (ii) | Tricoderma polysporum |
(C) | Streptokinase | (iii) | Penicillium notatum |
(D) | Penicillin | (iv) | MonascuS purpureus |
Options:
(A)-(i), | (B)-(ii), | (C)-(iii), | (D)-(iv) | |
(A)-(iii), | (B)-(iv), | (C)- (ii), | (D)-(i) | |
(A)-(iv), | (B)-(iii), | (C)-(ii), | (D)-(i) | |
(A)-(ii), | (B)-(iv), | (C)- (i), | (D)-(iii) |