Question

Concept Check 1
Answer the following questions
1. Why are the cells of epidermis of a leaf thin and transparent?
2. Why do leaves turn yellowish if they do not get plenty of sunlight
3. Name the biological process that releases oxygen into the air.
4. Does any transpiration occur during photosynthesis?
5. When do the guard cells become flaccid?
6. Name the pigment that is essential for photosynthesis.
7. By which process is solar energy converted into chemical energy?​

Answer 1

Answer:

1. Epidermis has thick cuticle layer over it which is transparent . It is transparent so that the light is reach the inner portion of leave . If it is not transparent, less light could reach to chrolophyll hence it reduce the amount of food processing during photosynthesis.
2. Actually, the green colour of the leaves is caused due to the presence of chlorophyll that reacts in the presence of sunlight, resulting in photosynthesis.As the leaves cannot produce foods due to the lack of sunlight, the plant becomes weaker and the leaves become yellow due to the degeneration of chlorophyll.
3. Photosynthesis
4. Transpiration is the evaporation of water from plants. It occurs chiefly at the leaves while their stomata are open for the passage of CO2 and O2 during photosynthesis.The photosynthesizing leaf loses substantial amount of water by evaporation. This transpired water must be replaced by the transport of more water from the soil to the leaves through the xylem of the roots and stem.
5. the guard cells have lost water, which causes the cells to become flaccid and the stomatal opening to close. This may occur when the plant has lost an excessive amount of water. In addition, it generally occurs daily as light levels drop and the use of CO2 in photosynthesis decreases.
6. Chlorophyll, is the primary pigment essential in photosynthesis, reflects green light and absorbs red and blue light most strongly. In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll.
7. Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water.