Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. Explain briefly the role of the following structures in this process.
(a) Guard cells ................................
(b) Cuticle ....................................
(c) Mesophyll cells ............................
(d) Xylem tissue in the leaf veins ................
(e) Phloem tissue in the leaf veins .............
(f) Stomata........................................
Photosynthesis in green plants is directly and indirectly dependent on so many plant structures. Explain briefly the role of the following structures in this process.
(a) Guard cells ................................
(b) Cuticle ....................................
(c) Mesophyll cells ............................
(d) Xylem tissue in the leaf veins ................
(e) Phloem tissue in the leaf veins .............
(f) Stomata........................................
(a) Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of air and water vapour through the stomata.
(b) Cuticle: Cuticle is transparent and water proof due to which light can penetrate this later easily.
(c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. Chloroplasts are mainly contained in the mesophyll cells. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially by the palisade cells.
(d) Xylem Tissue in the Leaf Veins: Water is essential for photosynthesis to occur. Water is taken up by the roots from the soil, sent up through the stem and finally brought to the leaves (site of photosynthesis) by the vascular tissue called the xylem .. The water is then distributed evenly in the mesophyll layer.
(e) Phloem Tissue in the Leaf Veins: The prepared food is transported from leaves to all parts of the plant by the phloem tissue. The glucose is converted into insoluble starch and later into soluble sugar i.e. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem.
(f) Stomata: The main function of stoma is to let the air in, containing carbon dioxide from the atmosphere for photosynthesis. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata.
(a) Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of air and water vapour through the stomata.
(b) Cuticle: Cuticle is transparent and water proof due to which light can penetrate this later easily.
(c) Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. Chloroplasts are mainly contained in the mesophyll cells. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially by the palisade cells.
(d) Xylem Tissue in the Leaf Veins: Water is essential for photosynthesis to occur. Water is taken up by the roots from the soil, sent up through the stem and finally brought to the leaves (site of photosynthesis) by the vascular tissue called the xylem .. The water is then distributed evenly in the mesophyll layer.
(e) Phloem Tissue in the Leaf Veins: The prepared food is transported from leaves to all parts of the plant by the phloem tissue. The glucose is converted into insoluble starch and later into soluble sugar i.e. sucrose, which is transported in solution through the phloem in the veins of the leaf and down through the phloem of the stem.
(f) Stomata: The main function of stoma is to let the air in, containing carbon dioxide from the atmosphere for photosynthesis. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata.
