Science (English Medium) कक्षा ११ - CBSE Question Bank Solutions for Biology

The eardrum is known as ______.  

Select the option with incorrect identification:

Suppose you accidentally find an old preserved permanent slide without a label. In your effort to identify it, you place the slide under microscope and observe the following features:-

1. Unicellular
2. Well defined nucleus
3. Biflagellate–one flagellum lying longitudinally and the other transversely.

What would you identify it as? Can you name the kingdom it belongs to?

The embryo sac of an Angiosperm is made up of ______.

If the diploid number of a flowering plant is 36. What would be the chromosome number in its endosperm ______.

Explain why sexual reproduction in angiosperms is said to take place through double fertilization and triple fusion. Also draw a labelled diagram of embryo sac to explain the phenomena.

Match the following and choose the correct option from below

Identify the simple tissue system from the following.

What is present on the surface of the leaves which helps the plant prevent loss of water but is absent in roots?

Below is a list of plant fibres. From which part of the plant these are obtained

Cotton

Epidermal cells are often modified to perform specialized functions in plants. Name some of them and the function they perform.

Plants require water for their survival. But when watered excessively, plants die. Discuss.

The stomatal pore is guarded by two kidney shaped guard cells. Name the epidermal cells surrounding the guard cells. How does a guard cell differ from an epidermal cell? Use a diagram to illustrate your answer.

Distinguish between the following:

Stem hair and root hair

Match the following with reference to cockroach and choose the correct option

How many times do nymphs moult to reach the adult form of cockroach?

Give the location of hepatic caeca in a cockroach. What is their function?

Structural organisation in animals attains different levels as cell - organ - organ system. What is missing in this chain? Mention the significance of such an organisation.

Complete the following statement:

In cockroach grinding of food particle is performed by ______.

Complete the following statement:

Malpighian tubules help in removal of ______.