The Fundamental Unit of Life Test

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The Fundamental Unit of Life Test - 19

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Weekly Quiz Competition

Question 1

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Use the following information to answer the next question.

During an experiment, Reena places a few raisins in a beaker containing pure water. After some time, she observes that the raisins have become swollen. She then places some of the swollen raisins in a beaker containing a highly concentrated salt solution. She observes the beaker for changes after an hour.

What happens to the raisins when they are first placed in purewater and then in theconcentrated salt solution?

They shrink and further shrink respectively.

They swell and further swell respectively.

They swell and shrink respectively.

They shrink and swell respectively.

Solution

When the raisins are in pure water, they become swollen because the medium surrounding the cells of the raisins has a high water concentration. Hence, water moves from a region of higher concentration to a region of lower concentration. The pure water moves into the cells of the raisins by osmosis, thereby causing them to swell.

When the swollen raisins are dipped in a highly concentrated salt solution, they shrink because water moves from a region of higher concentration to a region of lower concentration. The concentrated salt solution has a lower concentration of water as compared to the cells of the raisins. Hence, water moves out of the cells of the raisins into the solution, thereby causing the raisins to shrink.

The correct answer is C.

Question 2
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Ribosomes are present on the surface of which cell organelle?

A
Chloroplast

B
Mitochondria

C
Golgi complex

D
Endoplasmic reticulum

Solution

The rough endoplasmic reticulum (RER) has ribosomes on its surface. Ribosomes help in the synthesis of proteins. The smooth endoplasmic reticulum (SER) does not have ribosomes on its surface. The SER helps in the synthesis of lipids.

The correct answer is D.
Question 3
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Plant and animal cells are structurally different from each other. Which cell structure is present in plant cells but absent in animal cells?

A
Cell wall

B
Golgi body

C
Plasma membrane

D
Endoplasmic reticulum

Solution

Cell wall is present only in plant cells. It provides structural strength to plant cells. It is made of cellulose.

The correct answer is A.
Question 4
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Cell wall is present only in plant cells. What is the primary function of cell wall?

A
Controlling various cellular activities

B
Transporting molecules within a cell

C
Helping in the synthesis of ATP

D
Providing structural strength

Solution

The cell wall is made of cellulose. It provides structural strength to plant cells.

The correct answer is D.