Page 182 - SUBSEC October 2017_Neat

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19. Which of the following statements provides 22. Which of the following correctly identifies the
the BEST explanation of why sucrose rather mammalian blood cell shown in the diagram
than glucose is transported by the phloem? below?

(A) Sucrose passes through plant cell
surface membranes more easily.
(B) Sucrose is a disaccharide and is
more easily converted to starch.
(C) Sucrose is a non-reducing sugar and
so it is less reactive.
(D) Sucrose synthesis does not require
ATP.
(A) macrophage
(B) red blood cell
20. The Mass Flow Theory of the transport of (C) neutrophil
organic solutes in the phloem postulates that (D) lymphocyte

(A) sucrose diffuses from mesophyll cells
into the phloem along a
concentration gradient 23. The graph below shows the oxygen
(B) sucrose moves by osmosis into the dissociation curve for human haemoglobin.
phloem when water ascends the
xylem into the leaf
(C) Sucrose is actively pumped by
mesophyll cells directly into the
phloem against a concentration
gradient
(D) sucrose is actively pumped by
companion cells mediating between
mesophyll cells and phloem against
a concentration gradient

21. In which of the following phases of the Which of the following ranges of partial
cardiac cycle is a pulse generated? pressures of oxygen would be found in
pulmonary arteries?
(A) Atrial systole
(B) Atrial diastole (A) Between 0 and 3 kPa
(C) Ventricular systole (B) Between 3 and 6 kPa
(D) Ventricular diastole (C) Between 6 and 9 kPa
(D) Between 9 and 12 kPa

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02207010/SPEC 2017