(a)[3]
Explain why transport systems are needed in multicellular plants and animals.
(b)
In mammals, the heart pumps blood around the body. The sequence of events in a single heartbeat is called the cardiac cycle. The timing of one cardiac cycle is shown in Fig. 6.1.
(b(i))
Using the answer spaces on Fig. 6.1, identify chambers P and Q.
(b(ii))[2]
Fill in the table by placing the letters V, W, X, Y and Z in the correct positions to show the state of the heart chambers during the cardiac cycle in Fig. 6.1.
(c)[4]
In plants, assimilates are carried in phloem sieve tube elements by translocation. Explain how assimilates that enter the phloem sieve tubes from mesophyll cells can be translocated to other parts of the plant.