19. As discussed in lecture, the endosperm nucleus in angiosperms a. arises from

Question

19. As discussed in lecture, the endosperm nucleus in angiosperms a. arises from the fusion between a polar nucleus and two sperm b. gives rise via mitosis to the male gametophyte c. undergoes meiosis in the pollen tube to yield two sperm d. none of the above 20. Based on the discussion in lecture, which of the following does NOT occur in a typical angiosperm leaf? . xylerm c. epidermis d. palisade mesophyll cells 21. Stomatal opening depends on a. active transport of potassium ions into the guard cells b. net movement of water out of the guard cells to maintain osmotic balance c. increased turgidity of the guard cells d. all of the above e. a and c, but not b 22. The light-harvesting reactions of photosynthesis a. use H2O as the initial electron donor b. occur in the stromna in the chloroplasts. c. utilize the ATP and NADPH produced by the CO2-fixation reactions d. all of the above e. a and b, but not c 23. The primary product of the reaction catalyzed by PEP carboxylase is a. oxaloacetate b. 2 3-phosphoglycerate c. pyruvate d. none of the above 24. In C, plants, the reaction catalyzed by PEP carboxylase a. occurs only in specialized bundle sheath cells, not in specialized mesophyll cells b. occurs only at night, when the stomata are closed. c. fixes the CO, released by the decarboxylation of malate d. a and c, but not b e. none of the above 25. Which of the following statements about photosynthesis in CAM plants is FALSE? a. When malate is removed from the vacuoles during the day and decarboxylated, the released CO2 is fixed by RuBP carboxylase b. CAM plants usually exhibit low photosynthetic rates c. CAM plants exhibit low photosynthetic water-use efficiencies d. The primary (or initial) reaction by which CO2 is fixed yields a four-carbon compound. 26. As discussed in lecture, the angle of leaf orientation influences absorbed shortwave radiation through its effect on the a. shortwave radiation incident on the leaf b. leaf absorptivity to shortwave radiation c. both of the above

Explanation / Answer

Answer:

19). d. None of the above

Explanation:

Endosperm is formed by the union of secondary nucleus (nucleus fused by two polar nuclei) and a sperm in angisperm and is triploid.

20). b. Pericycle

Explanation: Mainly pericycle is found in roots of angiosperms to produce lateral roots.

21). d. All of the above

22). a. Use H2O as the initial electron donor

Explanation: Light reaction occurs in grana and produces ATP & NADPH

23). a. Oxaloacetate

Explanation: The PEP carboxylase involves in C4 cycle, where the first stable compound formed is OAA (oxaloacetate).

24). e. None of the above

Explanation:

PEP is found in mesophyll cells but not in bundle sheath cells. It doesn't depend on light, it means that it occurs both in light and dark. It fixes CO2 absorbed from the atmosphere. RUBISCO enzyme fixes the CO2 released by the decarboxylation of malate in C4 plants.

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