Question

(D)Answer The Following Question. [5X2=10pts]

(i)List two adaptations in plants to reduce transpiration.

(ii)Why green leaves are thin and broad?

(iii)Mention two difference between chloroplast and chlorophyll.

(iv)Define polymerisation.Give the abbreviation of NADPH.

(v)Why do leaves of some plants wilt on hot days?​

Answer 1

Answer:

2. Due to their broad surface areas, green leaves can absorb more sunlight at a given time, and due to the thinness of the leaves, the light energy can easily penetrate the leaf surface and be trapped by the chloroplasts. This makes photosynthesis efficient. Therefore, green leaves are thin and broad.

3. Difference Between Chlorophyll and Chloroplast

Mainly, chlorophyll absorbs red and blue light from the sun converting it into chemical energy but chloroplast is a part where photosynthesis takes place.

Answer 2

Answer:

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Explanation:

1. A waxy cuticle is relatively impermeable to water and water vapour and reduces evaporation from the plant surface except via the stomata. A reflective cuticle will reduce solar heating and temperature rise of the leaf, helping to reduce the rate of evaporation.
2. Due to their broad surface areas, green leaves can absorb more sunlight at a given time, and due to the thinness of the leaves, the light energy can easily penetrate the leaf surface and be trapped by the chloroplasts. This makes photosynthesis efficient. Therefore, green leaves are thin and broad.
3. chlorophyll absorbs red and blue light from the sun converting it into chemical energy but chloroplast is a part where photosynthesis takes place.
4. NADPH. Abbreviation for nicotinamide adenine dinucleotide phosphate (reduced form).
5. Plants frequently wilt in hot weather, allowing both leaves and flowers to droop, sometimes to an alarming degree. Wilting occurs when the pace at which plant leaves dispel moisture into the air, in a process called transpiration, outpaces the ability of plant roots to supply enough water.