Q. No.Match each item in Column I with one item in Column II and chose your answer from the codes given below.
|
Column I (stage of prophase I) |
Column II (event) |
|
I. Zygotene II. Pachytene III. Diplotene IV. Diakinesis |
1. Crossing over 2. Chiasmata formation 3. Bivalent formation 4. Terminalization of chiasmata |
Codes:
I II III IV
1. 1 2 3 4
2. 2 1 4 3
3. 3 1 2 4
4. 3 2 1 3
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 |
Match the following Column-I with Column-II.
| Column-I | Column-II | ||
| A. | Synapsis aligns homologous chromosomes | (i) | Anaphase II |
| B. | Synthesis of RNA and protein | (ii) | Zygotene |
| C. | Action of enzyme recombinase | (iii) | G2 - phase |
| D. | Centromeres do not separate, but chromatids move towards opposite poles | (iv) | Anaphase I |
| (v) | Pachytene |
1. A-(ii), B-(i), C-(iii), D-(iv)
2. A-(ii), B-(iii), C-(v), D-(iv)
3. A-(i), B-(ii), C-(v), D-(iv)
4. A-(ii), B-(iii), C-(iv), D-(v)
Match the following
| Column l | Column lI | ||
| a. | G1 phase | (i) | Longest phase of cell cycle |
| b. | M phase | (ii) | Synthesis of histone proteins |
| c. | S-phase | (iii) | Cell quiescence |
| d. | G0 phase | (iv) | Nuclear division |
1. a(i), b(i), c(iv), d(iii)
2. a(i), b(iv), c(ii), d(iii)
3. a(i), b(iv), c(iii), d(ii)
4. a(iv), b(iii), c(i), d(ii)
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 given two statements:
| I: | Meiosis is responsible for maintaining the chromosome number across generations in sexually reproducing organisms. |
| II: | Meiosis results in reduction of chromosome number by half in the daughter cells. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | I is incorrect but II is correct |
| Assertion (A): | Meiosis conserves specific chromosome number of each species across generations in sexually reproducing organisms. |
| Reason (R): | Meiosis, per se, results in reduction of chromosome number by half. |
| 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. | Both (A) and (R) are False. |
| 1. | Metaphase I | Bivalent alignment on the equatorial plate |
| 2. | Anaphase I | Splitting of centromere |
| 3. | Prophase II | Nuclear membrane disappears by the end |
| 4. | Metaphase II | Microtubules from the opposite poles of the spindle get attached to the kinetochores of sister chromatids |
| Column-I | Column-II | ||
| A. | Zygotene | P. | Crossing over |
| B. | Pachytene | Q. | Synapsis |
| C. | Diplotene | R. | Terminalization of chiasmata |
| D. | Diakinesis | S. | Appearance of chiasmata |
| A | B | C | D | |
| 1. | Q | P | S | R |
| 2. | P | Q | S | R |
| 3. | P | Q | R | S |
| 4. | Q | P | R | S |
Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R)
| Assertion (A): | The growth of the multicellular organism is due to mitosis |
| Reason (R): | Mitosis is also called as equational division and it offers genetic stability |
In light of the above statements choose the correct answer from the options given below:
| 1. | (A) is True but (R) is False. |
| 2. | (A) is False but (R) is True. |
| 3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
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