Assertion(A): | Mitosis does play a role in gamete formation. |
Reason(R): | Haploid organisms divide by mitosis. |
1. | Both (A) & (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) & (R) are true but (R) is not the correct explanation of (A) |
3. | (A) is a true statement but (R) is false. |
4. | Both (A) and (R) are false statements. |
Read the four statements (a-d) and choose the correct option.
a. | Spindle fibers attach to kinetochores of chromosomes during metaphase. |
b. | Cell growth results in disturbing the ratio between the nucleus and the cytoplasm. |
c. | Pachytene stage is relatively short-lived compared to the leptotene. |
d. | Interkinesis is a short-lived stage characterized by duplication of DNA. |
1 a, b & c are correct
2 Only c is incorrect
3 b & d are correct
4 a & b are correct
Consider the following four statements (I- IV) related to cell cycle, and select the correct option stating them as true (T) and false (F)
I. | Cell growth in terms of cytoplasmic increase is a continuous process. |
II. | Interphase is the phase of actual cell division. |
III. | The number of chromosomes doubles in S-phase. |
IV. | The cell that do not divide further exits G1-phase to enter a metabolically inactive stage. |
I | II | III | IV | |
1. | T | F | F | F |
2. | F | T | T | T |
3. | F | F | T | T |
4. | T | F | F | T |
Statement I: | In mitosis, chromosomal number in the progeny as well as in parents remains the same |
Statement II: | Mitosis takes place in gametes |
1. | Both statement I and statement II are correct |
2. | Both statement I and statement II are incorrect |
3. | Statement I is correct but statement II is incorrect |
4. | Statement I is incorrect but statement II is correct |
Assertion(A): | In metaphase, chromosomes are spread through the cytoplasm of the cell. |
Reason(R): | There is complete disintegration of the nuclear envelope at the end of the prophase. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
3. | (A) is true, but (R) is false. |
4. | (A) is false, but (R) is true. |
Assertion(A): | During Anaphase the centromere is at the leading edge, with the arms of the chromosome trailing behind. |
Reason(R): | At the onset of Metaphase, the sister chromatids of chromosomes get separated from each other. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
3. | (A) is true, but (R) is false. |
4. | (A) is false, but (R) is true. |
Assertion(A): | Mitosis is called equational division. |
Reason(R): | The amount of DNA is the same in parent and progeny cells if it is mitosis. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
3. | (A) is true, but (R) is false. |
4. | (A) is false, but (R) is true. |
Assertion(A): | Cell growth disturbs the nuclear-cytoplasmic ratio. |
Reason(R): | The disturbance in the nucleo-cytoplasmic ratio stimulates cell division. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true, but (R) is not the correct explanation of (A). |
3. | (A) is true, but (R) is false. |
4. | (A) is false, but (R) is true. |