Question 1 of 34
Among eukaryotes, replication of DNA takes place in
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Cell Cycle and Cell Division PYQs
Class XI Biology • NCERT Based • NEET Practice
Question 2 of 34
Which of the following stages of meiosis involves division of centromere?
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Question 3 of 34
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
Explanation:
The recombination nodules appear during the pachytene stage of prophase I. This is the stage when crossing-over between homologous chromosomes occurs, facilitated by synapsis. Thus, recombination nodules form to mediate genetic exchange.
🧠 Did You Know?In later stages, chiasmata become visible as remnants of crossing-over during diplotene and are seen until metaphase I.
💡 NCERT Memory Line:Crossing over and recombination nodules occur during pachytene of prophase I.
Question 4 of 34
Match List-I with List-II
Choose the correct answer from the options given below:
| List-I | List-II |
|---|---|
| (A) M Phase | (I) Proteins are synthesized |
| (B) G2 Phase | (II) Inactive phase |
| (C) Quiescent stage | (III) Interval between mitosis and initiation of DNA replication |
| (D) G1 Phase | (IV) Equational division |
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Question 5 of 34
Given below are two statements:
Statement I: During Go phase of cell cycle the cell is metabolically inactive.
Statement II: The centrosome undergoes duplication during S phase of interphase.
In the light of the above statements, choose the most appropriate answer from the option below:
Statement I: During Go phase of cell cycle the cell is metabolically inactive.
Statement II: The centrosome undergoes duplication during S phase of interphase.
In the light of the above statements, choose the most appropriate answer from the option below:
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Question 6 of 34
Select the correct statements
A.Tetrad formation is seen during leptotene.
B.During Anaphase, the centromere split and chromatids separate.
C.Terminalization takes place during Pachytene.
D.Nucleolus, Golgi complex and ER are reformed during Telophase.
E.Crossing over takes place between sister chromatids of homologous.
Choose the correct answer from the option given below:
A.Tetrad formation is seen during leptotene.
B.During Anaphase, the centromere split and chromatids separate.
C.Terminalization takes place during Pachytene.
D.Nucleolus, Golgi complex and ER are reformed during Telophase.
E.Crossing over takes place between sister chromatids of homologous.
Choose the correct answer from the option given below:
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Question 7 of 34
Which one of the following never occurs during mitotic cell division?
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Question 8 of 34
The appearance of recombination nodules on homologous chromosomes during meiosis characterizes :
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Question 9 of 34
Match List-I with List-II.
Choose the correct answer from the options given below:
| List-I | List-II |
|---|---|
| (A)Metacentric chromosome | (I)Centromere situated close to the end forming one extremely short and one very long arms |
| (B)Acrocentric chromosome | (II)Centromere at the terminal end |
| (C)Submetacentric | (III)Centromere in the middle forming two equal arms of chromosomes |
| (D)Telocentric chromosome | (IV)Centromere slightly away from the middle forming one shorter arm and one longer arm |
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Question 10 of 34
Select the incorrect statement with reference to mitosis:
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