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
medical entrance questions
Wednesday, June 25, 2008
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