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Test: Mitosis (NCERT) - NEET MCQ

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

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Test: Mitosis (NCERT) - Question 1

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 for Test: Mitosis (NCERT) - Question 1

The correct answer is OPTION 1: (i) S-Phase (ii) Interphase (iii) Prophase (iv) Mitosis

  • During the S phase of interphase, centrioles replicate and begin to migrate to the opposite pole of the cell during the prophase stage of mitosis.
  • Interphase is the time between the end of one cell division and the beginning of the next.
  • It is also known as the non-dividing stage and the resting phase.
  • It is a very active metabolic phase that is followed by the dividing M phase.
  • Mitosis is an indirect cell division, also known as reductional cell division, in which the somatic cell divides in such a way that the chromosome number in the daughter cell remains constant.
  • The longest phase of mitosis or karyokinesis is prophase.
Test: Mitosis (NCERT) - Question 2

______ is the best stage to count the number and study the morphology of chromosomes.

Detailed Solution for Test: Mitosis (NCERT) - 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.

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Test: Mitosis (NCERT) - Question 3

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 for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 4

During anaphasic movements of chromosomes, ______ of each chromosome is/are towards the pole and _____ of the chromosome trail(s) behind.

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 5

What is true about telophase stage of mitosis?

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 6

Mitotic spindle is mainly composed of _________ protein.

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 7

Microtubules are absent in

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 8

During cell division, the spindle fibres get attached to condensing chromosome at a highly differentiated region. This region is called as

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 9

If the tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single-cell undergone?

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 10

Which phase of mitosis is essentially the reverse of prophase in terms of nuclear changes?

Detailed Solution for Test: Mitosis (NCERT) - 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. 

Test: Mitosis (NCERT) - Question 11

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 for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 12

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 for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 13

In above sequence of figures showing different stages of cell division, the missing stage (ii) is

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

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

Test: Mitosis (NCERT) - Question 14

The separation of two chromatids of each chromosome at early anaphase is initiated by

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 15

Cell would normally proceed to mitosis without interruption

Detailed Solution for Test: Mitosis (NCERT) - 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.

Test: Mitosis (NCERT) - Question 16

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

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

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

Test: Mitosis (NCERT) - Question 17

Amitosis usually occurs in

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

Amitosis is a method of direct cell division in which the nucleus divides into two daughter nuclei without showing differentiation of chromosomes and development of spindle. It is commonly seen in prokaryotes.

Test: Mitosis (NCERT) - Question 18

During which stages of mitosis and meiosis, respectively does the centromere of each chromosome split ?

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

The centromere of each chromosome splits during the anaphase stage of both mitosis and meiosis.

In mitosis, this happens during anaphase, when sister chromatids separate and move to opposite poles of the cell.

In meiosis, the centromere splits during anaphase II, which is similar to anaphase of mitosis, and sister chromatids separate.

So, the correct answer is : Option D

Test: Mitosis (NCERT) - Question 19

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 for Test: Mitosis (NCERT) - Question 19

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.

Test: Mitosis (NCERT) - Question 20

Among eukaryotes, replication of DNA takes place in :

Detailed Solution for Test: Mitosis (NCERT) - Question 20

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.

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