Q. No.R: Haploid organisms divide by mitosis.
1. Both Assertion & Reason are true and the Reason is the correct explanation of the Assertion.
2. Both Assertion & Reason are true but the Reason is not the correct explanation of the Assertion
3. Assertion is a true statement but Reason is false.
4. Both Assertion and Reason are false statements.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
| Assertion (A): | Meiosis leads to recombinations of genes. |
| Reason (R): | Crossing over occurs in pachytene sub-stage of prophase I of meiosis. |
| 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. |
R: Crossing over provides proof in favour of the linear arrangement of genes on chromosomes.
In the following questions, a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).
3. If Assertion is a true statement but Reason is false, then mark (3).
4. If both Assertion and Reason are false statements, then mark (4).
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
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 ll
a phase (i) Longest phase of cell cycle
b M phase (ii) Synthesis of histone proteins
c S-phase (iii) Cell quiescence
d 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)
| List I | List II |
| A. Pairing of homologous chromosomes | I. Chiasmata |
| B. Actual interchange of segments between two homologous chromosomes | II. Synaptonemal complex |
| C. Protein body formed between paired homologs | III. Synapsis |
| D. The cross shaped configuration visible between homologs | IV. Crossing over |
1. A - (IV); B - (III); C- (I); D - (II)
2. A - (III); B - (IV); C- (I); D - (II)
3. A - (III); B - (IV); C- (II); D - (I)
4. A - (IV); B - (III); C- (II); D - (I)
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 exist G1-phase to enter an inactive stage.
Options :
I II III IV
1. T F F F
2. F T T T
3. F F T T
4. T F F T
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 does not divide further exits G1-phase to enter a metabolically inactive stage.
Options:
I II III IV
1. T F F F
2. F T T T
3. F F T T
4. T F F T
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