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

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 ______.

The term synergistic action of hormones refers to ______.

To increase sugar production in sugarcanes, they are sprayed with ______.

ABA acts antagonistic to ______.

Plant growth substances (PGS) have innumerable practical applications. Name the PGS you should use to

Increase yield of sugar cane