CELL REPRODUCTION

CELL REPRODUCTION


1. In cell cycle, DNA/chromosomes doubles in its amount due to its synthesis ( replication or

duplication). It occurs in

a. G1-phase b. G2-phase c. S- Phase d. I-Phase

2. The active phase, also called metabolic or energetic phase with most cytogenetic activity is

a. Inter phase b. M-phase c. Meiosis d. Pachytene

3. Yeasts show which type of cell division? a. Amitosis b. Mitosis c. Meiosis

d. Endomitosis

4. Number of meiotic divisions required to produce 100 micro spores in angiosperm is

a. 125 b. 100 c. 50 d. 25

5. Number of meiotic divisions required to produce 100 micro spores (pollens) in an

angiosperm is

a. 125 b. 100 c. 50 d. 25

6. In Pinus, number of chromosomes in pollen grains is 6. The number of chromosomes in

endosperm after fertilization will be

a. 12 b. 24 c. 36 d. 6

7. A diploid somatic cell can divide by

a. Mitosis but not meiosis b. Meiosis but not mitosis c. Meiosis or mitosis

d. Amitosis only

8. To observe chiasmata, the most appropriate stage of meiosis would be

a. Metaphase-II b. Diakinesis c. Diplotene d. Pachytene

9. In Pachytene
a. Chromosomes stain faintly b. Chromosomersw are not visible

c. Chromosomes coil more d. Chromatides are not visible

10. The best stage to view structure, size and to count the number of chromosomes is

a. Metaphase b. Late prophase c. Early anaphase d. I-phase

11. In Spirogyra/Ulothrix/ Chlamydomonas, meiosis occurs in

a. Egg b. Oosphere c. Gametangium d. Zygospore/zygote

12. In which sub phase of I-phasem damaged DNA is repaired?

a. S-phase b. G1 c. G2 d. M-phase

13. Duplication of chromosomes occurs at

a. Synthetic phase b. Prophase c. Anaphase d. Metaphase

14. Where does meiosis occur in Thallophytes?

a. Zygote b. Spore mother cells c. Sporangium d. Gametangium

15. Where does meiosis occur in tomato?

a. In micro and megaspore mother cell b. Pollen sac and ovule

c. Both correct d. In zygospore or zygote

16. Which of the following is longest duration inmitosis?

a. Prophase b. Metaphase c. Anaphase d. Telophase

17. Meiosis in ferns like Dryopteris, Adiantum occurs during

a. Germination of spores b. Formation of spores c. Formation of gamete

d. Germination of zygote

18. In meiosis, chromatids separate at

a. Anaphase I b. Anaphase II c. Diakinesis d. Diplotene

19. In which stage chromosomes go toward the opposite poles?

a. Prophase b. Metaphase c. Anaphase d. Telophase

20. How many times a cell has to divide mitotically to produce 128 cells?

a. 127 b. 126 c. 128 d. 7

21. How many successive generations of mitosis must occur to produce 256 cells?

a. 7 b. 8 c. 128 d. 255

22. How meiosis are required to produce 400 seeds of Pea?

a. 400 b. 600 c. 500 d. 800

23. Colchicine & Granosan bring polyploidy by

a. Inhibiting spindle formation at metaphase b. Inhibiting spindle at anaphase

c. Splitting chromosomes d. Not allowing disappearance of nuclear membrane.

24. Law of segregation of Mendel is actually/ segregation of Mendelian factors (Aa) occurs

during

a. Diplotene b. Anaphase I c. Anaphase II d. Fertilization

25. The formation of multivalents at meiosis in a diploid organism is due to

a. Reciprocal trans location b. Inversion c. Deletion d. monosomy

ANSWERS
1. c 2. a 3. a 4. b 5. d 6. d 7. a 8. c 9. c 10. a

11. d 12. c 13. a 14. a 15. c 16. a 17. b 18. b 19. c 20. d

21. b 22. c 23. a 24. b
25. a