Question

. Describe why CAM plants have an advantage over C3 plants in the desert and why C4 plants have an advantage over C3 plants in tropical climates. (Be sure to discuss the relevance of photosynthetic enzymes and their location, photorespiration, water use efficiency, and stomatal behavior and leaf anatomy.)

4. Thinking about anatomy, morphology, and “behavior” describe ways that plant leaves are adapted to intercepting light, increasing CO2 diffusion while reducing water loss.

5. In general terms, describe the characteristics of plant growth regulators then describe how they differ from animal hormones. Also illustrate why this is so with a detailed example of how plant hormones work in controlling leaf abscission.

Answer 1

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3):

• C3 plants exhibit photorespiration as Rubisco can bind to oxygen and waste the products of light reactions i.e. ATP and NADPH.
• C4 plants exhibit Kranz anatomy. They exhibit spatial separation of primary and secondary carboxylation events
• Primary carboxylation occurs in the mesophyll cells by PEP carboxylase.
• Secondary carboxylation occurs in the bundle sheath cells by Rubisco.
• CAM plants exhibit scoto-active stomata. They exhibit temporal separation of primary and secondary carboxylation events
• Primary carboxylation occurs in the mesophyll cells by PEP carboxylase during the night time.
• Secondary carboxylation occurs in the mesophyll cells by Rubisco during the day time.

4):

• Leaves as a rule have less stomata on their top surface to diminish this water misfortune.
• Photosynthesis is the procedure by which leaves assimilate light and carbon dioxide to create glucose (nourishment) for plants to develop.
• Leaves are adjusted to play out their capacity, eg they have an enormous surface zone to assimilate daylight.

                   Leaves diminished to spines due to lessens the surface zone for transpiration.

                   Decreased number of stomata to diminishes the transpiration rate.

                    Waxy leaf fingernail skin which Impermeable to water, which stops dissipation.

                    Moved leaves, leaf hairs, and stomata soaked in pits which raps sodden air, which expands the   stickiness and lessens the dispersion of water fume.

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