Question

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Answer 1

1. Give reasons why leaves are considered to be most suitable and well adapted organs to carry out photosynthesis.

Ans. The reasons for considering leaves suitable and well adapted organs to carry out photosynthesis are:

1. They have larger surface area.
2. They have stromata for gaseous exchange.
3. They have chlorophyll to absorb sunlight.

2. Name the organelle where chlorophyll is found.

Ans. Chlorophyll is found in chloroplast of plant cell.

Chloroplast are sites of photosynthesis present in plants and green algae.

3. Explain explain in brief the following terms thylakoid grana and stroma.

Ans. Thylakoids:

• Thylakoids are compartments present inside the chloroplast.
• They consist of Thylakoid membrane surrounding a thylakoid lumen.
• They are sites for light dependent reaction reaction of photosynthesis.

Granum:

• The coin shaped structures of thylakoids found inside the chloroplast are known as granum.
• There are 2 or more than 2 (even 100) stacks of thylakoids in a granum.
• Granum increases the surface area of the thylakoids, which helps in more absorption of light.

Stroma:

• The colourless fluid surrounding grana in the chloroplast is stroma.
• Stroma contains dissolved enzymes, specific proteins, ribosomes etc.
• The enzymes present in it are essential for photosynthesis.

Answer 2

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Explanation: