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State that assimilates dissolved in water, such as sucrose and amino acids, move from sources to sinks in phloem sieve tubes
1 Answer Explain how companion cells transfer assimilates to phloem sieve tubes, with reference to proton pumps and cotransporter proteins
1 Answer Make annotated drawings of transverse sections of leaves from xerophytic plants to explain how they are adapted to reduce water loss by transpiration
1 Answer Explain how hydrogen bonding of water molecules is involved with movement of water in the xylem by cohesion-tension in transpiration pull and by adhesion to cellulose in cell walls
1 Answer Explain that transpiration involves the evaporation of water from the internal surfaces of leaves followed by diffusion of water vapour to the atmosphere
1 Answer State that some mineral ions and organic compounds can be transported within plants dissolved in water
1 Answer Explain mass flow in phloem sieve tubes down a hydrostatic pressure gradient from source to sink
1 Answer Describe the distribution of xylem and phloem in transverse sections of stems, roots and leaves of herbaceous dicotyledonous plants
1 Answer Relate the structure of xylem vessel elements, phloem sieve tube elements and companion cells to their functions
1 Answer State that a polypeptide is coded for by a gene and that a gene is a sequence of nucleotides that forms part of a DNA molecule
1 Answer
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan