Tissues Test - 20

Xylem is not a simple permanent tissue. It is a complex permanent tissue as it is made up of more than one type of cell.

Hence, the correct answer is option D.

Why alternatives A, B and C are wrong:

Collenchyma, chlorenchyma, and epidermis are made up of only one type of cell. Hence, they are simple permanent tissues.

Sclerenchyma is the tissue that makes a plant hard and stiff. Its constituent cells are long and narrow because of lignin deposition. However, these cells are dead. This tissue provides strength to plant parts.

The correct answer is C.

Chlorenchyma contains the green pigment chlorophyll. Hence, it is able to perform photosynthesis.

The correct answer is D.

Why alternative A is wrong:

Aerenchyma is a type of parenchyma tissue that has air cavities between its cells. It is found in aquatic plants. It provides buoyancy to these plants in order to help them float. It lacks chlorophyll.

Why alternative B is wrong:

Collenchyma provides flexibility to plants. It lacks chlorophyll.

Why alternative C is wrong:

Sclerenchyma provides strength to plant parts. It is made of dead cells and lacks chlorophyll.

Collenchyma provides flexibility to plant parts such as leaf, stem, etc. The cells of this tissue are living and have small intercellular spaces between them. These cells are thickened at the corners.

The correct answer is B.

Phloem is a type of complex permanent tissue that helps in the translocation of food. It is made up of four types of elements: sieve tubes, companion cells, phloem fibres, and phloem parenchyma.

The correct answer is D.

Xylem and phloem are types of complex permanent tissue as they are made up of more than one type of cell. Xylem helps in the conduction of water, while phloem helps in the translocation of food. Together, they constitute a vascular bundle.

The correct answer is D.

Why alternatives A, B and C are wrong:

Chlorenchyma and aerenchyma are simple permanent tissues as they are made of only one type of cell.

Sieve tubes and companion cells are parts of phloem. These are involved in the transportation of food.

The correct answer is D.

Why alternatives A, B and C are wrong:

Tracheids and vessels are parts of xylem. These are tubular structures that can easily conduct water and minerals vertically.

Xylem parenchyma cells are similar to parenchyma cells but their walls are thicker than normal parenchyma cells. They store food in the form of starch and help in the sideways conduction of water.

The correct answer is D.

Why alternative A is wrong:

Vessels consist of non-living cells that are arranged end to end.

Why alternative B is wrong:

Tracheid is a non-living elongated cell. It helps in the transport of water and minerals.

Why alternative C is wrong:

Xylem fibres provide strength to plant parts.