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Test: Meiosis (NCERT) - NEET MCQ


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20 Questions MCQ Test Biology Class 11 - Test: Meiosis (NCERT)

Test: Meiosis (NCERT) for NEET 2024 is part of Biology Class 11 preparation. The Test: Meiosis (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Meiosis (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Meiosis (NCERT) below.
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Test: Meiosis (NCERT) - Question 1

To build up food reserves in the cytoplasm, chromosomes become unfolded to start transcription of mRNA and rRNA, during which phase of meiosis I? 

Detailed Solution for Test: Meiosis (NCERT) - Question 1

In diplotene stage of meiosis I, the chromosomes may unfold to nearly form and start transcription of mRNA and rRNA to build up food reserves in the cytoplasm. This process is most pronounced in the primary oocytes of amphibians, reptiles and birds. In some species, the chromosomes enlarge greatly, assuming lampbrush form.

Test: Meiosis (NCERT) - Question 2

During meiosis -I, chromosome number?

Detailed Solution for Test: Meiosis (NCERT) - Question 2

Meiosis is the type of cell division by which gamete cells (eggs and sperm) are produced. Meiosis involves two successive nuclear divisions and one cytoplasmic division that produce four haploid cells. The first division (meiosis 1) is the reductional division during which number of chromosomes is reduced to half. The second division (meiosis II) separates the chromatids. It is called equational division as chromosome number remains the same as produced after meiosis-l.

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Test: Meiosis (NCERT) - Question 3

At which of the following stages, the chromosomes appear single, thin and thread like?

Detailed Solution for Test: Meiosis (NCERT) - Question 3

Leptotene also known as leptonema is the first stage of prophase I during which individual chromosomes begin to condense into long strands within the nucleus which are loossely interwoven. However, the two sister chromatids are still so tightly bound that they are indistinguishable from one another. They possess a string of swollen areas called chromomeres.

Test: Meiosis (NCERT) - Question 4

What is cytokinesis?

Detailed Solution for Test: Meiosis (NCERT) - Question 4

Cytokinesis is the division of the cell's cytoplasm, which occurs after the nucleus has divided (mitosis or meiosis). This process ensures that the cytoplasmic contents and organelles are evenly distributed between the two daughter cells, completing the cell division process. In animal cells, cytokinesis is achieved through the formation of a cleavage furrow that pinches the cell into two. In plant cells, a cell plate forms to divide the cell. Cytokinesis is essential for the physical separation of the daughter cells.

Test: Meiosis (NCERT) - Question 5

Assertion (A): During mitosis, the chromosome number of the daughter cells is the same as that of the parent cell.

Reason (R): Mitosis involves a single round of DNA replication followed by a single cell division.

Detailed Solution for Test: Meiosis (NCERT) - Question 5

The assertion is true because mitosis results in two daughter cells each having the same number of chromosomes as the parent cell, maintaining the species' specific chromosome number. The reason correctly explains the assertion because the single round of DNA replication before the cell division ensures that each daughter cell receives an exact copy of the parent cell's genome.

Test: Meiosis (NCERT) - Question 6

Which of the following is a characteristic feature of telophase?

Detailed Solution for Test: Meiosis (NCERT) - Question 6

A characteristic feature of telophase is the re-formation of the nuclear envelope around the chromosomes at each pole of the cell. This phase marks the end of the nuclear division process, with the chromosomes beginning to decondense and return to their less compact chromatin state. Telophase sets the stage for cytokinesis, which will physically divide the cell into two daughter cells.

Test: Meiosis (NCERT) - Question 7

Identify the given figures showing meiotic phases and select the correct option.

Detailed Solution for Test: Meiosis (NCERT) - Question 7

All the stages are of the meiosis 1 because here we can see the bivalent or tetrad stages. Metaphase is the stage where chromosome comes on the equator and bivalent arrange themselves on the equatorial plate. Then anaphase 1 involves the separation of a homologous chromosome which start moving up to opposite poles and each tetrad is divided into two daughter cells. So anaphase involves the production of chromosome number and is also known as disjunction. Telophase 1 shows the formation of two daughter nuclei but the chromosome number is half then the chromosome number of mother cell and nuclear membrane reappears.

Test: Meiosis (NCERT) - Question 8

An anther has 1200 pollen grain. How many PMCs must have been there to produce them?

Detailed Solution for Test: Meiosis (NCERT) - Question 8

Meiosis of one Pollen Mother Cell (PMC) produces 4 haploid pollen grains. Thus, for producing 1200 pollen grains 1200/4=300 PMCs are required.

Test: Meiosis (NCERT) - Question 9

If 2n = 4, then identify the figures A, B and C, as per the following codes and select the correct option.

 Anaphase of meiosis I = (i)
 Anaphase of mitosis = (ii)
 Anaphase of meiosis II = (iii)

Detailed Solution for Test: Meiosis (NCERT) - Question 9

During anaphase of mitosis, each chromosome arranged at metaphase plate is split and two daughter chromatids are formed. Centromeres split and chromatids move to opposite poles. During anphase I of meiosis I, the homologous chormosomes separate, while sister chromatids remain associated at their centromeres. Anaphase II of meiosis II begins with simultanoeus splitting of the centromere of each chromosome allowing them to move towards oppostie poles of the cell.

Test: Meiosis (NCERT) - Question 10

What does (i) and (ii) represent in the given flowchart?

Detailed Solution for Test: Meiosis (NCERT) - Question 10

Meiosis I consists of separation of the homologous chromosomes, each made up of two sister chormatids into two cells. Entire haploid content of chomosomes is contained in each of the resulting daughter cells. The first meiotic division therefore reduces the ploidy of the original cell by a factor of 2. Meiosis II consists of decoupling of each chormosome sister strands (chromatids) and segregating the individual chromatids into haploid daughter cells. The two cells resulting from meiosis I divide during meiosis II, creating 4 haploid daughter cells.

Test: Meiosis (NCERT) - Question 11

During meiosis - I in humans, one of the daughter cells receives

Detailed Solution for Test: Meiosis (NCERT) - Question 11

During pachytene sub-stage of meiosis I, crossing over i.e. exhcnage of genetic material takes place between homologous, which results in recombinations. The two homologous chromosomes are contributed by different parents. One of them is partnerl chromosome and the other one is maternal chormosome.

Test: Meiosis (NCERT) - Question 12

The members of a homologous pair of chromosomes

Detailed Solution for Test: Meiosis (NCERT) - Question 12

Homologous chormosomes are chormosomes having same structural features. In dipilod nuclei, pairs of homologous chromosomes can be identified at the start of meiosis. One member of each pair comes from the female parent and other from the male parent. Homologous chromosomes have the same pattern of genes along the chromosome but the nature of the genes may differ.

Test: Meiosis (NCERT) - Question 13

Which event does NOT occur during prophase of mitosis?

Detailed Solution for Test: Meiosis (NCERT) - Question 13

The alignment of chromosomes at the metaphase plate does not occur during prophase of mitosis. This event occurs during metaphase, the stage following prophase. Prophase is characterized by the condensation of chromatin into visible chromosomes, the breakdown of the nuclear envelope, and the beginning of the formation of the mitotic spindle.

Test: Meiosis (NCERT) - Question 14

During which phase of the cell cycle does the cell prepare for mitotic division by rapidly growing and synthesizing a wide range of proteins?

Detailed Solution for Test: Meiosis (NCERT) - Question 14

The G₂ phase of the cell cycle is a period of rapid cell growth and protein synthesis, during which the cell prepares for mitotic division. This phase follows DNA replication in the S phase and precedes the M phase (mitosis), ensuring that the cell has all the necessary components for successful division.

Test: Meiosis (NCERT) - Question 15

Four different steps that occur during meiosis are given in the following list.
(i) Complete separation of chromatids
(ii) Pairing of homologous chromosomes 
(iii) Lining up of paired chromosomes on equator
(iv) Crossing over between chromatids
Select the correct sequential arrangement of the steps.

Detailed Solution for Test: Meiosis (NCERT) - Question 15

Pairing of homologous chromosomes occurs in zygotene and crossing over occurs in pachytene stage of prophase I of meiosis I. Paired chromosomes line up on equator in metaphase I. Then there is complete separation of chromatids in anaphase I of meiosis I.

Test: Meiosis (NCERT) - Question 16

Meiosis consists of 

Detailed Solution for Test: Meiosis (NCERT) - Question 16

Meiosis is a double division that occurs in the reproductive cell in which nucleus divide but chromosome replicate only once to form four haploid cells, each cell having half the number of chromosomes present in a parent cell. It causes a reduction in the number of chromosomes. It is also known as reduction division. Meiosis in a cell occurs only once to form gametes.

Test: Meiosis (NCERT) - Question 17

Which phase of mitosis is characterized by the alignment of chromosomes at the cell's equator?

Detailed Solution for Test: Meiosis (NCERT) - Question 17

Metaphase is characterized by the alignment of chromosomes at the cell's equator, also known as the metaphase plate. This alignment ensures that each daughter cell will receive an equal and identical set of chromosomes when the chromosomes are pulled apart in the subsequent anaphase.

Test: Meiosis (NCERT) - Question 18

Disjunction refers to

Detailed Solution for Test: Meiosis (NCERT) - Question 18

The homologous chromosomes break their connections and separate out during anaphase I of meiosis I. This process of separation is named as disjunction.

Test: Meiosis (NCERT) - Question 19

At what phase of meiosis there are two cells, each with separated sister chromatids that have been moved to opposite spindle poles?

Detailed Solution for Test: Meiosis (NCERT) - Question 19

Anaphase II, where the centromeres are cleaved, allows the kinetochores to pull the sister chromatids apart. The sister chromatids by convention are now called sister chromosomes and they are pulled towards opposte poles.

Test: Meiosis (NCERT) - Question 20

Meiosis involves one cycle of ______

Detailed Solution for Test: Meiosis (NCERT) - Question 20
  • Meiosis is divided into two stages- meiosis I and meiosis II.
  • In each stage, the cell undergoes separation of chromosomes during anaphase I and anaphase II, cytokinesis and karyokinesis.
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