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

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 ______.

Complete the following statement:

Hind gut of cockroach is differentiated into ______.

Complete the following statement:

In cockroach blood vessels open into spaces called ______.

Mention special features of eye in Cockroach.

Explain the digestive system of Cockroach with the help of a labelled sketch.

Give the biochemical composition of plasma membrane. How are lipid molecules arranged in the membrane?

Structure and function are correlatable in living organisms. Can you justify this by taking plasma membrane as an example?

Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against the following whether they were initially obtained as a natural product or as a synthetic chemical.

Penicillin ______

Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against the following whether they were initially obtained as a natural product or as a synthetic chemical.

Sulfonamide ______

Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against the following whether they were initially obtained as a natural product or as a synthetic chemical.

Vitamin C ______

Medicines are either man made (i.e., synthetic) or obtained from living organisms like plants, bacteria, animals etc. and hence the latter are called natural products. Sometimes natural products are chemically altered by man to reduce toxicity or side effects. Write against the following whether they were initially obtained as a natural product or as a synthetic chemical.

Growth Hormone ______

Which of the following statements does not apply to reverse osmosis?

Osmosis is a special kind of diffusion, in which water diffuses across the cell membrane. The rate and direction of osmosis depends upon both ______.

The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances are mostly across the cell membrane, because ______.