The Fundamental Unit of Life Test - 18

The plant cells contain chloroplasts, which help them manufacture their own food. Hence, trees can make their own food because of the presence of chloroplast.

The correct answer is B.

Lysosomes that contain digestive enzymes, breakdown old and worn-out cell organelles. Lysosomes also breakdown the foreign particles that enter the cell

The correct answer is A.

Why alternative B is wrong:

Ribosomes take part in protein synthesis. They do not digest worn-out cell organelles. Hence, this alternative is incorrect.

Why alternative C is wrong:

Vacuole stores food material and waste products. It does not digest worn-out cell organelles. Hence, this alternative is incorrect.

Why alternative D is wrong:

Nucleus controls the activities of the cell. It does not digest worn-out cell organelles. Hence, this alternative is incorrect.

In plant cells, the cell wall is not involved in protein synthesis.

The correct answer is A.

Vacuole does not store the genetic material i.e., DNA. It is stored in the nucleus.

The correct answer is D.

The cell membrane acts as a cell boundary. It allows selected molecules to move in and out of a cell.

The correct answer is A.

Why alternative B is wrong:

Mitochondria are cell organelles that generate energy in cells. They do not control the movement of molecules in and out of cells. Hence, this alternative is incorrect.

Why alternative C is wrong:

Golgi body modifies proteins.It does not control the movement of molecules in and out of a cell. Hence, this alternative is incorrect.

Why alternative D is wrong:

Nucleus controls the functions of a cell. It does not control the movement of molecules in and out of a cell. Hence, this alternative is incorrect.

Golgi apparatus modifies the proteins produced in the cell, packages them in vesicles, which are small bladder-like cavities, and directs them to their destined location.

The correct answer is A.

Why alternative B is wrong:

Ribosomes are involved in the synthesis of proteins. Hence, this alternative is incorrect.

Why alternative C is wrong:

Endoplasmic reticulum is involved in the transport of substances within a cell. Hence, this alternative is incorrect.

Why alternative D is wrong:

Lysosomes digest chemicals in the cell. Hence, this alternative is incorrect.

Chloroplasts are cell organelles containing chlorophyll, through which the process of photosynthesis in plants is performed.

The correct answer is B.

Why alternative A is wrong:

Mitochondria are cell organelles that perform respiration in cell. They are present in plant and animal cells. Therefore, this alternative is incorrect.

Why alternative C is wrong:

The smooth endoplasmic reticulum helps in the production of lipids. It is present in both plant and animal cells. Therefore, this alternative is incorrect.

Why alternative D is wrong:

The rough endoplasmic reticulum helps in the production of proteins. It is present in both plant and animal cells. Therefore, this alternative is incorrect.

Diffusion is a simple process in which molecules move from an area of their high concentration to an area of their low concentration by balancing their concentration across the membranes.

The correct answer is A.

Why alternative B is wrong:

Molecules can move from an area of their low concentration to an area of their high concentration with the expenditure of energy. Diffusion is a simple process that does not require energy.

Why alternative C is wrong:

During osmosis, molecules move from an area of their high concentration to an area of their low concentration through a
semi-permeable membrane.

Why alternative D is wrong:

Molecules can move from an area of their low concentration to an area of their high concentration with the expenditure of energy. Diffusion is a simple process that does not require energy.