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Test: Cell Cycle & Cell Division - 2


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25 Questions MCQ Test Biology Class 11 | Test: Cell Cycle & Cell Division - 2

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Test: Cell Cycle & Cell Division - 2 - Question 1

How many chromosomes are present in the each cell of the onion root tip?

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 1

The root tip cells of onion were used to test the potentially genotoxic effects of Alprazolam. The test was carried out according to Fiskesjö protocol (4, 11-12) with some modifications. Common onion (Allium cepa L.) has eight pairs of relatively large chromosomes (2n = 16) that allows for the easy detection of CAs.

Test: Cell Cycle & Cell Division - 2 - Question 2

Dinoflagellates possess condensed chromosomes even in interphase, their nucleus is called

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 2

Dinoflagellates are unicellularprotists which exhibit a great diversity of form. They possess condensed chromosomes even during interphase. Their nucleus is called as mesokaryon.

Test: Cell Cycle & Cell Division - 2 - Question 3

Astral body are formed of

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 3

Astral body are formed of microtubules. Astral bodies are produced by centriole during cell division and attach with centromere of the chromosome.

Test: Cell Cycle & Cell Division - 2 - Question 4

The small disc shaped like structures occur in the centromere are called as

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 4

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.

Test: Cell Cycle & Cell Division - 2 - Question 5

Human ------------- do not divide after birth.

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 5

Human nerve cells do not divide after birth. The neural system is the control system of the body which consists of highly specialized cells called neurons. Nerve cell does not divide because they do not have centrioles, so they cannot undergo mitosis and divide to form new cells.

Test: Cell Cycle & Cell Division - 2 - Question 6

In animal cells, during G2 phase

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 6

During the G2 phase, proteins are synthesised in preparation for mitosis while cell growth continues.

Test: Cell Cycle & Cell Division - 2 - Question 7

Division of nucleus without being followed by cytokinesis results into

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 7

If cytokinesis doesn't take place after karyokinesis, formation of daughter cells from the parent cell doesn't take place. The parent cell will have more than one nucleus, which are supposed to be present in daughter cells.

If it's a plant cell, cell plate formation doesn't take place.

If it's an animal cell, a furrow doesn't appear.

Cytokinesis means division of cytoplasm. So, the cytoplasmic division doesn't take place after the division of nucleus(karyokinesis).

Hence, the correct answer is Option D.

Test: Cell Cycle & Cell Division - 2 - Question 8

Plant mitosis is generally controlled by

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 8

In plant cell, mitosis cell division is generally controlled by cytokinin hormone. Auxinis also required for cell division in plant.

Test: Cell Cycle & Cell Division - 2 - Question 9

Arrange the order of events taking place in anaphase II stage of meiosis:
a. Metaphase plate spilts
b. Each chromosome moves away from equatorial plane
c. Centromeres split and chromatids separate.
d. Chromatids move to opposite poles

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 9

Solution : 

The correct option is Option B.

The centromeres separate and the sister chromatids—now individual chromosomes—move toward the opposite poles of the cell. To replay the anaphase II animation, click the Replay button. The centromeres separate, and the two chromatids of each chromosome move to opposite poles on the spindle.

Test: Cell Cycle & Cell Division - 2 - Question 10

In diploid cells,each homologous chromosome consists of

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 10

In Diploid cells, each homologous chromosome consists of one paternal and one maternal chromosomethat fuse together during fertilization of gametes.

Test: Cell Cycle & Cell Division - 2 - Question 11

The resting phase is otherwise called as

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 11

The interphase, though called the resting phase, is the time during which the cell is preparing for divisionby undergoing both cell growth and DNA replication in an orderly manner.

Test: Cell Cycle & Cell Division - 2 - Question 12

Which of the following phases in mitosis is in correct order?

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 12

Mitosis is also divided into four stages namely prophase, metaphase, anaphase and telophase.

Test: Cell Cycle & Cell Division - 2 - Question 13

During mitosis ER and nucleolus begin to disappear at

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 13

During mitosis, Endoplasmic Reticulum (ER) and nucleolus begin to disappear at early prophase and these are not observed in late prophase. 

Test: Cell Cycle & Cell Division - 2 - Question 14

Which one is not a significance of meiosis division?

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 14

Meiosis cell division results into number of chromosome reduce to half, recombination of genes and formation of spores and gametes.

Test: Cell Cycle & Cell Division - 2 - Question 15

Polyploidy is the property of

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 15

Polyploidy is the condition in which more than one set of chromosome is present in one cell. It is the property of increasing the number of chromosomes sets of the cell.

Test: Cell Cycle & Cell Division - 2 - Question 16

In animal cells, the mitotic division is seen in

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 16

option C diploid somantic cells is correct answer. 

Explanation:-

In animals, mitotic cell division is only seen in the diploid somantic cells. 


Reason :- The plants can show mitosis divisions in both  haploid and diploid cells

Test: Cell Cycle & Cell Division - 2 - Question 17

In the metaphase stage, the chromosomes are made up of

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 17

At metaphase stage, the chromosome is made up of two sister chromatids, which are held together by the centromere.

Test: Cell Cycle & Cell Division - 2 - Question 18

In animal cells, Cytokinesis takes place by furrow deepening centripetally and formation of two daughter cells. This method is known as

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 18

In animal cell, cytokinesis takes place by furrow deepening centripetally and formation of two daughter cells. This method of cytokinesis is known as cleavage cytokinesis.

Test: Cell Cycle & Cell Division - 2 - Question 19

In telophase I, which of the following event takes place?

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 19

In telophase I, the nuclear membrane and nucleolus reappear.Meiosis II is similar to mitosis.

Test: Cell Cycle & Cell Division - 2 - Question 20

Lampbrush chromosome where two homologous chromosome with several chiasmata with several loops in chromatic region is found in

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 20

Egg yolk contains lampbrush chromosome where two homologous chromosomes with several chiasmata with several loop in chromatic region is found.

Test: Cell Cycle & Cell Division - 2 - Question 21

In which stage, the cells remain metabolically active but do not proliferate?

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 21

The quiescent stage (G0) of the cell cycle. Cells in this stage remainmetabolically active but no longer proliferate unless called on to do so.

Test: Cell Cycle & Cell Division - 2 - Question 22

The nuclear structures disappear during

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 22

During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down.

Test: Cell Cycle & Cell Division - 2 - Question 23

An alkaloid widely used in plant breeding for doubling the chromosome number also known as ‘mitotic poison’ is

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 23

Colchicine is an alkaloid used in plant breeding for doubling of chromosomeby inhibiting cytokinesis. It is also called as mitotic poison.

Test: Cell Cycle & Cell Division - 2 - Question 24

Synapsis occurs between

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 24

Synapsis occur between two homologous chromosome during zygotene phase of prophase of meiosis I due to presence of synaptical complex between homologous chromosomes.

Test: Cell Cycle & Cell Division - 2 - Question 25

Number of chromosome and amount of DNA content per cell change during

Detailed Solution for Test: Cell Cycle & Cell Division - 2 - Question 25

Number of chromosome changes during anaphase of meiosis I and amount of DNA content increaseduring S-phase of cell cycle.

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