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

What are gas vacuoles? State their functions?

What is the function of a polysome?

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.

Polysaccharide ______

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.

Fat ______

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.

Water ______

Enzymes are proteins. Proteins are long chains of aminoacids linked to each other by peptide bonds. Aminoacids have many functional groups in their structure. These functional groups are, many of them at least, ionisable. As they are weak acids and bases in chemical nature, this ionization is influenced by pH of the solution. For many enzymes, activity is influenced by surrounding pH. This is depicted in the curve below, explain briefly.

Nucleic acids exhibit secondary structure, justify with example.

Nucleic acids exhibit secondary structure. Describe through Wetson- Crick Model.

Based on the figure given below which of the following statements is not correct?

Energy required for ATP synthesis in PSII comes from ______.

\[\ce{2H2O -> 4H^{+} + O2 + 4e^{-}}\]

Based on the above equation, answer the following questions:

1. Where does this reaction take place in plants?
2. What is the significance of this reaction?

NADP reductase enzyme is located on ______.

Breakdown of proton gradient leads to release of ______.

Where is NADP reductase enzyme located in the chloroplast? What is the role of this enzyme in proton gradient development?

ATPase enzyme consists of two parts. What are those parts? How are hey arranged in the thylakoid membrane? Conformational change occur n which part of the enzyme?

How are photosynthesis and respiration related to each other?

Explain how during light reaction of photosynthesis, ATP synthesis is a chemiosmotic phenomenon.

Find out how Melvin Calvin worked out the complete biosynthetic pathway for synthesis of sugar.

Tomatoes, carrots and chillies are red in colour due to the presence of one pigment. Name the pigment. Is it a photosynthetic pigment?

The entire process of photosynthesis consists of a number of reactions. Where in the cell do these take place?

Fixation of CO₂ ______