Test: Cell : The Fundamental Unit Of Life - 3


25 Questions MCQ Test Science Class 9 | Test: Cell : The Fundamental Unit Of Life - 3


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QUESTION: 1

Besides cellulose microfibrils, the other two cell wall networks are :-

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QUESTION: 2

Middle lamella occurs :-

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QUESTION: 3

Hydrophilic chemical of cell wall is :-

Solution: Pectic acid: It is the major component of the middle lamella but is also found in the primary walls. Pectic acid is the polymer of about 100 galacturonic acid molecules. It is hydrophilic in nature. It forms salt bridges with calcium and magnesium ions. The carboxyl groups of the galacturonic acid molecules are weak acids so they can exist in negatively charged and uncharged states depending on the protonation.
QUESTION: 4

Structural element of cell wall is :-

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QUESTION: 5

Different layers of cell wall are :-

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QUESTION: 6

The first wall layer of the cell is:-

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Plant cell wall consists of three layers: the primary cell wall, secondary cell wall and the middle lamella. The middle lamella - It is first layer formed during cell division. This layer is rich in pectin. It is the outermost layer, joins together adjacent plant cells and holds them together.

QUESTION: 7

Plant cells are distinguishable from animal cell in containing :-

Solution: Cell wall because animal cells contain only plasma membrane while plant cells contain both plasma membrane and cell wall which helps them to withstand extreme conditions
QUESTION: 8

Ripe fruits soften due to :-

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QUESTION: 9

Ribosomes contain large quantities of :-

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QUESTION: 10

The glycocalyx is:-

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QUESTION: 11

Which of the following organelles lack membranes ?

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QUESTION: 12

eRF1 is the release factor in eukaryotes that requires 

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QUESTION: 13

When did J.E Purkinje coin the term "protoplasm"?

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QUESTION: 14

A unit of protoplasm having a nucleus and covered by plasmalemma is called :-

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QUESTION: 15

The term cytoplasm was coined by :-

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QUESTION: 16

Which of the following is correct for prokaryotic ribosome :-

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QUESTION: 17

Golgi apparatus takes part in synthesis of :-

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QUESTION: 18

In a cell DNA is found in :-

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QUESTION: 19

Cartilage matrix is digested during its osteogenesis through :-

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QUESTION: 20

Which one is lysosomal activity :-

Solution: Lysosomes.know to be the suicidial bag of cells secreats many digestive enzymes.now explanation to bit c.removal of obstruction. now it secreats digestive enzymes..it refers that it has the chemical secreation which can digest things..when a cell is dead it needs to be decomposed and this is done by lysomes. It brusts out and digests out the unwanted things.. now explanation to bit b. mobilisation. These cell organelle are made by rough endoplasmic reticulum..now this helps in transportation of proteins and lipids to different parts of the cell..to repair worn out parts.. explanation to point a. now disintegration of tail of tadpole requires digestion of tail part cell regions.
QUESTION: 21

“All cells arise from per existing cells” who said this?

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QUESTION: 22

Which of the following is known as “physical basis of life”?

Solution: Protoplasm is known as the physical basis of life.According to Huxley the protoplasm is the physical basis of life. Inside the cell wall of living cell the living substance is known as protoplasm. The protoplasm is a thick fluid or jelly like substance It is a very complex substance and found to be dispersed in the medium of water. Life is not possible without protoplasm hence called physical basis of life.
QUESTION: 23

The term protoplasm was coined by

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QUESTION: 24

Find the incorrect statement

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QUESTION: 25

The largest cell in the human body is

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The Ovum or the “Egg” is the largest cell of the human body.The human egg is a giant compared to other cells in the body. It has a diameter of about 100 microns (millionths of a meter), or roughly the thickness of a strand of hair.