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

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?

Why is respiratory pathway referred to as an amphibolic pathway? Explain.

Respiratory pathway is believed to be a catabolic pathway. However, nature of TCA cycle is amphibolic. Explain.

Ethylene is used for ______.

Coconut water contains ______.

The affect of apical dominance can be overcome by which of the following hormone ______.

Match the following:

Apples are generally wrapped in waxed paper to ______.