CBSE Class 11 Biology Cell Cycle and Cell Division Worksheet Set 01

Question. During which stages (or prophase I substages) of meiosis do you expect to find the bivalents and DNA replication respectively? 
(a) Pachytene and interphase (between two meiotic divisions)
(b) Pachytene and interphase (just prior to prophase I)
(c) Pachytene and S phase (of interphase just prior to prophase I)
(d) Zygotene and S phase (of interphase prior to prophase I)
Answer. D

Question. When synapsis is complete all along the chromosome, the cell is said to have entered a stage called
(a) zygotene
(b) pachytene
(c) diplotene
(d) diakinesis
Answer. B

Question. The correct sequence in cell cycle is 
(a) S - G1 - G2 - M
(b) S - M - G1 - G2
(c) G1 - S - G2 - M
(d) M1 - G1 - G2 - S
Answer. C

Question. The stage of meiosis where centromere separate
(a) metaphase I
(b) metaphase II
(c) anaphase I
(d) anaphase II
Answer. D

Question. Which one of the following precedes reformation of the nuclear envelope during Mphase of the cell cycle? 
(a) Decondensation from chromosomes and reassembly of the nuclear lamina.
(b) Transcription from chromosomes and reassembly of the nuclear lamina.
(c) Formation of the contractile ring and formation of the phragmoplast.
(d) Formation of the contractile ring and transcription from chromosomes.
Answer. A

Question. Match the description (given in column I) with correct stage of prophase I (given column II) and choose the correct option. 
   Column I                              Column II
A. Chromosomes are              I. Pachytene
moved to spindle
equator
B. Centromere splits and        II. Zygotene
chromatids move apart
C. Pairing between                III. Anaphase
homologous
chromosomes takes
place
D. Crossing between             IV. Metaphase
homologous
chromosomes
(a) A – I; B – II; C – III; D – IV
(b) A – II; B – III; C – IV; D – I
(c) A – IV; B – III; C – II; D – I
(d) A – III; B – I; C – IV; D – II
Answer. C

ASSERTION REASON QUESTIONS

Directions : These questions consist of two statements, each printed as Assertion and Reason.While answering these questions, you are required to choose any one of the following five responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.

Question. Assertion: Meiosis results in production of haploid cells.
Reason: Synapses occurs during leptotene.
Answer. C

Directions : Each of these questions contains an Assertion followed by Reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Question. Assertion : Meiosis II is known as equational or homotypic division. 
Reason : Meiosis II produces same number of chromosome in cell.
Answer. A

Question. Assertion : Interphase is resting stage.
Reason : The interphase cell is metabolically inactive. 
Answer. C

Question. Assertion : During zygotene, chromosomes show bivalent stage.
Reason : Bivalent is half the number of chromosomes. 
Answer. B

Question. Assertion : The stage between two mitotic divisions is called interkinesis.
Reason : Interkinesis is generally short lived.
Answer. D

Question. Assertion : Diplotene is characterized by the presence of chiasmata.
Reason : Diplotene can last for months and years in oocytes of some vertebrates.
Answer. B

 

 

Answer. A cell formed by the division or budding of another is called daughter cell.

 

Answer. Growth and reproduction are the characteristics of cells of all living organisms.

 

Answer.There are 16 chromosomes in each cell.

 

Answer. DNA synthesis occurs only during one specific stage in the cell cycle.

 

Answer. DNA replication begins in the nucleus and the centriole duplicates in the cytoplasm.