QUESTION 27 Some plants, such as cactus, has a carbon-fhxing adaptation to deser

Question

QUESTION 27 Some plants, such as cactus, has a carbon-fhxing adaptation to desert conditions. Their stomata close during the day and open at night to fixe CO 2. They are_ O a. C3 plants O b. C4 plants C. CAM plants QUESTION 28 Which of the statement about enzymes is not right? O a, change the rate, not the outcome of a reaction o b.only act on specific substrates .they may catalyze the same reaction repeatedly, as bng as substrates are available d. reactions permanently alter or use up enzyme molecules. QUESTION 29 The oxygen released in o a. carbon dioxide O b. glucose O c. ribulose biphosphate o d. water o e. atmospheric oxygen comes from QUESTION 30 In addition to light, plants need which of the following to carry on photosynthesis? o a. H20 o b. Co2 d. lipid o e. both H20 and CO2

Explanation / Answer

27) The correct option is CAM plants.

CAM Plants such as cactus lose a lot of water when they open stomata to get CO2 for the process of photosynthesis in hot, dry deserts. They lose less water by only opening stomata at night.

28) The correct option is d. reactions permanently alter or use up enzyme molecules.

Enzymes doesn’t change the reaction permanently; however, it is in equilibrium with the product. Also, in these reactions, the enzymes are not used up. The function of enzyme to catalyse the reaction.

29) The correct option is d. water.

The oxygen is released during the process of photosynthesis that comes from the splitting of water.

30) The correct option is e. both H2O and CO2.

Plants need chloroplasts, light, H2O and CO2 to carry out the photosynthesis process.

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