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NEET Exam  >  NEET Test  >  Biology Class 11  >  20-Minute Test: Mitosis (NCERT) - NEET MCQ

Mitosis (NCERT) - Free MCQ Practice Test with solutions, NEET Biology


MCQ Practice Test & Solutions: 20-Minute Test: Mitosis (NCERT) (20 Questions)

You can prepare effectively for NEET Biology Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "20-Minute Test: Mitosis (NCERT)". These 20 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 20

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20-Minute Test: Mitosis (NCERT) - Question 1
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Select the correct option:Centrioles undergo duplication during _______(i) of ________(ii), and begin to move towards opposite poles of the cell during ________(iii) stage of _________(iv).

Detailed Solution: Question 1

In animal cells, during the S phase of interphase, DNA replication begins in the nucleus and the centriole duplicates in the cytoplasm. These duplicated centrioles move towards opposite poles of the cell in prophase of mitosis.

20-Minute Test: Mitosis (NCERT) - Question 2
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______ is the best stage to count the number and study the morphology of chromosomes.

Detailed Solution: Question 2

The best stage to count the number and study the morphology of chromosomes is during metaphase. During metaphase, the chromosomes are condensed and highly visible, making it easier to count and study their structure. The chromosomes are also lined up at the equatorial plane of the cell, which makes it easier to observe them under a microscope.

Metaphase is a stage in the process of cell division known as mitosis, during which the cell's nucleus divides into two identical daughter nuclei. At this stage, the chromosomes, which contain the cell's genetic material, are visible under a microscope as thin, elongated structures. They are arranged in pairs, with one chromosome from each pair being inherited by each daughter nucleus.

By counting the number of chromosomes and studying their morphology (shape, size, and structure), scientists can learn more about the genetic makeup of an organism and how it may be affected by various factors, such as environmental conditions or genetic mutations.

Topic in NCERT: Metaphase

Line in NCERT: "This then, is the stage at which morphology of chromosomes is most easily studied."

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20-Minute Test: Mitosis (NCERT) - Question 3
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At which stage of mitosis, the two daughter chromatids separate from each other, migrate towards the opposite poles and are now referred to as chromosomes of the future daughter nuclei?

Detailed Solution: Question 3

In anaphase, the centromeres of chromosomes start to divide into two, forming daughter chromosomes with centromere in each. Daughter chromosomes are repulsive, so they migrate towards opposite poles. Spindle fibres attached to the centromeres shorten and pull the chromosomes to the poles.

Topic in NCERT: Anaphase

Line in NCERT: "At the onset of anaphase, each chromosome arranged at the metaphase plate is split simultaneously and the two daughter chromatids, now referred to as daughter chromosomes of the future daughter nuclei, begin their migration towards the two opposite poles."

20-Minute Test: Mitosis (NCERT) - Question 4
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During anaphasic movements of chromosomes, ______ of each chromosome is/are towards the pole and _____ of the chromosome trail(s) behind.

Detailed Solution: Question 4

In anaphasic movement of chromosomes, the centromeres lead the path while the arms trail behind. As a result the anaphasic chromosomes appear V., L, J- and I-shaped. The shapes are formed respectively in metacentric, submetacentric, acrocentric and telocentric chromosomes.

Topic in NCERT: Anaphase

Line in NCERT: "the centromere of each chromosome remains directed towards the pole and hence at the leading edge, with the arms of the chromosome trailing behind."

20-Minute Test: Mitosis (NCERT) - Question 5
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What is true about telophase stage of mitosis?

Detailed Solution: Question 5

During telophase, the individual chromosomes are no longer seen and chromatin material tends to collect in a mass at the two poles. Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. Nuclear envelope assembles around the chromosome clusters. Nucleolus, Golgi complex and ER reform.

Topic in NCERT: Telophase

Line in NCERT: "At the beginning of the final stage of karyokinesis, i.e., telophase, the chromosomes that have reached their respective poles decondense and lose their individuality. The individual chromosomes can no longer be seen and each set of chromatin material tends to collect at each of the two poles. This is the stage which shows the following key events: Chromosomes cluster at opposite spindle poles and their identity is lost as discrete elements. Nuclear envelope develops around the chromosome clusters at each pole forming two daughter nuclei. Nucleolus, golgi complex and ER reform."

20-Minute Test: Mitosis (NCERT) - Question 6
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Mitotic spindle is mainly composed of _________ protein.

Detailed Solution: Question 6

Spindle fibres are structures formed from mictrobubules in the cytoplasm during cell division. Microtubules are made up of tubulin protein. Spindle fiberes move chromatids or chromosomes diametrically apart and gather them in two d=clusters at opposite ends (poles) of the cell.

Topic in NCERT: PROPHASE

Line in NCERT: "The two asters together with spindle fibres forms mitotic apparatus."

20-Minute Test: Mitosis (NCERT) - Question 7
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Microtubules are absent in

Detailed Solution: Question 7

Microtubule is a microscopic tubular structure, with an external diameter of 24 nm and of variable length, found in a wide range of eukaryotic cells. Microtubules are composed of numerous subunits of the globular protein tubulin and occur singly or in pairs, triplets, or bundles. Microtubules help cells to maintain their shape. They also occur in cilia and eukaryotic flagella and the centrioles and form the spindle during nuclear division. A further role is in the intracellular transport of materials and movement of organelles.

20-Minute Test: Mitosis (NCERT) - Question 8
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During cell division, the spindle fibres get attached to condensing chromosome at a highly differentiated region. This region is called as

Detailed Solution: Question 8

The key feature of metaphase is the attachment of spindle fibers to kinetochores of chromosomes. Kinetochores are disc-shaped structure at the surface of the centromeres. These structures serve as the site of attachment of spindle fibres to the chromosomes that are moved toward poles.

Topic in NCERT: Metaphase

Line in NCERT: "Small disc-shaped structures at the surface of the centromeres are called kinetochores. These structures serve as the sites of attachment of spindle fibres (formed by the spindle fibres) to the chromosomes that are moved into position at the centre of the cell."

20-Minute Test: Mitosis (NCERT) - Question 9
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If the tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single-cell undergone?

Detailed Solution: Question 9

Each cycle produces 2 daughter cells. It is calculated by the formula (2number of cycles= number of daughter cells). Ten cycles are required to produce 1024 cells as follows:

210 = 1024.

20-Minute Test: Mitosis (NCERT) - Question 10
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Which phase of mitosis is essentially the reverse of prophase in terms of nuclear changes?

Detailed Solution: Question 10

During telophase of mitosis viscosity of cytoplasm decreases. A new nuclear membrane is formed (either from older nuclear envelope or ER) around each set of chromosomes. Chromosomes overlap farming chromatin. The nucleolar organiser region of satellite chromosomes produce nucleolus for each daughter nucleus. Nucleoplasm surrounds in the area of chromatin. The gel state of spindle is converted into sol state and disappears. In this way two daughter nuclei are formed at the poles of spindle. Hence this phase is just reverse of prophase. 

Topic in NCERT: Telophase

Line in NCERT: "At the beginning of the final stage of karyokinesis, i.e., telophase, the chromosomes that have reached their respective poles decondense and lose their individuality."

20-Minute Test: Mitosis (NCERT) - Question 11
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The given graph shows the change in DNA content during various phases (A to D) in a typical mitotic cell cycle. Identify the phases and select the correct option.

Detailed Solution: Question 11

During G1 phase, DNA content is 2C.S phase is marked by replication of DNA and the amount of DNA per cell is doubled. During G2 phase, synthesis of RNA and proteins takes place. During mitosis, DNA content gets equally distributed among two daughter cells.

Topic in NCERT: CELL CYCLE AND CELL DIVISION

Line in NCERT: "The interphase is divided into three further phases: G1 phase (Gap 1), S phase (Synthesis), G2 phase (Gap 2)."

20-Minute Test: Mitosis (NCERT) - Question 12
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A cell's division time is 1 minute. In 20 minutes, a culture tube (culture medium) is 1/8th filled with cells. When the tube will be fully filled?

Detailed Solution: Question 12

In 20 mins. Culture tube 1/8th filled with cells. Each cell divides every minute producing two daughter cells.
Hence, 21 min = 1/8 × 2 = 1/4
In 22 min 1/4 × 2 = 1/2
In 23 min 1/2 × 2 = 1
That means, in 23 minutes the culture tube will be completely filled.

20-Minute Test: Mitosis (NCERT) - Question 13
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In above sequence of figures showing different stages of cell division, the missing stage (ii) is

Detailed Solution: Question 13

Figure (i) shows metaphase II and figure (iii) shows telophase II, Hence, the missing figure is that of anphase II.

Topic in NCERT: CELL CYCLE AND CELL DIVISION

Line in NCERT: "The stages through which a cell passes from one division to the next is called the cell cycle."

20-Minute Test: Mitosis (NCERT) - Question 14
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The separation of two chromatids of each chromosome at early anaphase is initiated by

Detailed Solution: Question 14

Kinetochore is a plate-like structure by which microtubules of the spindle attach to the centromere of a chromosome during nuclear division. The centromere of each chromosome divides into two, so that each chormatied comes to have its own centromere. The two chromatids now start repelling each otherand separate completely to become daughter chromosmes. the daughter or new chromosmes. The daughter or new chromosomes move towards the poles of spindle along the path of their chromosome fibres.

Topic in NCERT: Anaphase

Line in NCERT: "Centromeres split and chromatids separate."

20-Minute Test: Mitosis (NCERT) - Question 15
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Cell would normally proceed to mitosis without interruption

Detailed Solution: Question 15

The availability of mitogen and energy rich compounds decide wheter G1 phase will be arrested (G0 phase) or undergo S-phase. This point is called check point or G1 cyclin or G1 point. Once the check point of G1-phase is crossed and cell has entered S-phase, cell cycle will go on further division till completion.

Topic in NCERT: S phase (Synthesis)

Line in NCERT: "S phase marks the phase of DNA replication and chromosome duplication."

20-Minute Test: Mitosis (NCERT) - Question 16
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Doubling of the number of chromosomes can be achieved by disrupting mitotic cell division soon after :

Detailed Solution: Question 16

Doubling of the number of chromosomes can be achieved by disrupting mitotic cell division soon after: Anaphase.

Topic in NCERT: Anaphase

Line in NCERT: "Centromeres split and chromatids separate."

20-Minute Test: Mitosis (NCERT) - Question 17
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All the following key events take place during telophase of mitosis except:

Detailed Solution: Question 17

All the following key events take place during the telophase of mitosis except:

Answer: B: Chromosomes become discrete

During telophase:

Chromosomes cluster at opposite spindle poles

Nuclear envelope reforms around each set of chromosomes

Nucleolus, ER, and Golgi complex reform

However, chromosomes becoming discrete is a characteristic of early mitotic stages (prophase).




     
Topic in NCERT: Telophase

Line in NCERT: "Nuclear envelope develops around the chromosome clusters at each pole forming two daughter nuclei."

20-Minute Test: Mitosis (NCERT) - Question 18
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The role of mitosis is not merely to divide a cell into two daughter cells but to ensure genetic continuity from one cell generation to another cell generation. The mechanism ensuring genetic continuity is 

Detailed Solution: Question 18

All the daughter cells of multicellular organism have the same number and type of chromosomes as parent cells due to equitable distribution of all chromosomes in mitosis. This helps in ensuring genetic continuity.

Topic in NCERT: Significance of Mitosis

Line in NCERT: "Mitosis usually results in the production of diploid daughter cells with identical genetic complement."

20-Minute Test: Mitosis (NCERT) - Question 19
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Among eukaryotes, replication of DNA takes place in :

Detailed Solution: Question 19

In eukaryotes, DNA replication takes place during the S phase (Synthesis phase) of the cell cycle. During this phase, the entire genome is replicated, resulting in two copies of each chromosome to ensure that both daughter cells receive a complete set of genetic information during cell division.

Topic in NCERT: S phase (Synthesis)

Line in NCERT: "S phase marks the phase of DNA replication and chromosome duplication."

20-Minute Test: Mitosis (NCERT) - Question 20
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During which stage of mitosis do the following events occur?I. Centromeres split and chromatids separateII. Chromatids move to opposite poles

Detailed Solution: Question 20

- Centromeres split and chromatids separate: Anaphase
- Chromatids move to opposite poles: Anaphase

In the Anaphase of mitosis, centromeres split, allowing sister chromatids to separate and move towards opposite poles of the cell. This stage is characterized by the movement of chromatids due to the shortening of microtubules attached to the kinetochores at the centromeres. This ensures that each daughter cell receives an identical set of chromosomes.

Topic in NCERT: Anaphase

Line in NCERT: "Centromeres split and chromatids separate. Chromatids move to opposite poles."

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This test contains 20 MCQs on 20-Minute Test: Mitosis (NCERT) with detailed solutions for each question. It is part of the Biology Class 11 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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