Test: Protective And Complex Plant Tissues

5 Questions MCQ Test Science Class 9 | Test: Protective And Complex Plant Tissues

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What does vascular bundle consist of?

A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in vascular tissue, which exists in two forms: xylem and phloem. Both these tissues are present in a vascular bundle, which in addition will include supporting and protective tissues.


The epidermis of desert plants has a thick waxy coating of:

Solution: Answer is cutin because it prevents leaves from transpiration as water is crucial for desert vegetation.

Which of the following protective tissue is absent in young stem of a plant?

Solution: The outer protective layer or bark of a tree is known as the cork. It is made up of dead cells. Therefore, it protects the plant against mechanical injury, temperature extremes, etc. It also prevents the loss of water by evaporation.

Suberin is impervious to:

Solution: Cellulose is the basic of the cell wall present in plants. The cell wall of almost all the organism are made up of cellulose whereas lipids along with some proteins forms the basic building blocks of plasma membrane. Plasma membrane is semipermeable and it is not impervious to water. Lignin is a complex polymer which acts as a cement and hardens the cell wall. It provides flexibility, great tensile and compressional strength to the cell wall and makes the cell wall impermeable. It is present in sclerenchyma cells and not in cork cells. The walls of cork cells are heavily thickened with an organic substance, suberin. Suberin makes these cells impervious to water and gases.

The kidney shaped cells surrounding stomata are called:

They are called guard cells. It helps in regulating the opening and closing of stomata. When water enters the guard cells it swells up resulting in opening of stomata. When water exits the guard cells it shrinks and the stomata is closed.

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