Science (English Medium) Class 11 - CBSE Question Bank Solutions for Biology

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 ______.

How does water moves within the root?

Why are natural membranes selectively permeable. Give examples.

The reaction that is responsible for the primary fixation of CO₂ is catalysed by ______.

\[\ce{3CO2 + 9ATP + 6NADPH + Water -> glyceraldehyde 3 – phosphate + 9 ADP + 6 NADP+ + 8 Pi}\]

Analyze the above reaction and answer the following questions:

1. How many molecules of ATP and NADPH are required to fix one molecule of CO₂?
2. Where in the chloroplast does this process occur?

What conditions enable Rubirco to function as an oxygenase? Explain the ensuing process.

Six turns of calvin cycle are required to generate one mole of glucose. Explain.

Why is the RuBisCo enzyme more appropriately called RUBP Carboxylase-Oxygenase and what important role does it play in photosynthesis?