Question:

What is true for cleavage

Updated On: May 1, 2024

Size of embryo increase
Size of cells decrease
Size of cells increase
Size of embryo decrease

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The Correct Option is B

Solution and Explanation

The correct option is (B) : Size of cells decrease

The zygote splits frequently during cleavage to separate the enormous cytoplasmic bulk into several tiny blastomeres. Because cells are still held within the zona pellucida, it includes cell division without size increase. However, during cleavage, cell size reduces.

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Match List I with List II :

List - I		List – II
A.	Residual Volume	i.	Maximum volume of air that can be breathed in after forced expiration
B.	Vital Capacity	ii.	Volume of air inspired or expired during normal respiration
C.	Expiratory Capacity	iii.	Volume of air remaining in lungs after forcible expiration
D.	Tidal Volume	iv.	Total volume of air expired after normal inspiration

Choose the correct answer from the options given below :

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The respiratory system

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Match List I with List II:

List I		List II
A	Robert May	I	Species-Area relationship
B	Alexander von Humboldt	II	Long term ecosystem experiment using out door plots
C	Paul Ehrlich	III	Global species diversity at about 7 million
D	David Tilman	IV	Rivet popper hypothesis

Choose the correct answer from the options given below:

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Species diversity

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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The potential (V) at any axial point, at 2 m distance(r) from the centre of the dipole of dipole moment vector \(\vec{P}\) of magnitude, 4 × 10^-6 C m, is ± 9 × 10³ V.
(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
Reason R : \(V=±\frac{2P}{4\pi \epsilon_0r^2}\), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below :
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Concepts Used:

Cell Cycle and Cell Division

Cell Cycle:

The sequence of events by which a cell copies itself synthesizes other constituents of the cell and eventually splits into two daughter cells is termed the cell cycle. The cell synthesizes all its constituents in a sequential pattern to make sure the proper division and distribution of components that occurs between the two daughter cells. Therefore, we can say that the cell cycle is the period of time between the development of new daughter cells and their further division.

Stages of Cell Cycle:

The cell cycle can be sub-divided into an additional category of Interphase. Meanwhile, the Interphase can be branched into 3 further stages, such as:

G1 Phase - “Gap 1 Phase”
S Phase - "Synthesis Phase"
G2 Phase - "Gap 2 Phase"

Read More: Cell Cycle and Cell Division

Cell Division:

The division of the parent cells into two or more cells is called daughter cell, cell division takes place. In general, it occurs as a part of a larger cell cycle. All the cell reproduces by dividing into two, wherein each parental cell produces two daughter cells.

Stages of Cell Division:

Cell division can be widely divided into several sub-segments that result from Mitosis and Meiosis.

Mitosis or (M Phase)
Meiosis

List - I		List – II
A.	Cells are metabolically active and proliferate	i.	\(G_2 phase\)
B.	DNA replication takes place	ii.	\(G_1 phase\)
C.	Proteins are synthesised	iii.	\(G_0 phase\)
D.	Quiescent stage with metabolically active cells	iv.	S phase

List - I		List – II
A.	Chiasmata formation	i.	Pachytene
B.	Crossing over	ii.	Diakinesis
C.	Synaptonemal complex formation	iii.	Diplotene
D.	Terminalisation of chiasmata	iv.	Zygotene