B. Two similar green plants are kept separately in oxygen free containers, one in dark and the other in continuous light. Which one will live longer? Give reasons. (a) Leaves of a healthy potted plant were coated with vaseline. Will this plant remain healthy for long? Give reasons for your answer. (b). What will happen to the rate of photosynthesis in a plant under the following circumstances?
(i) cloudy day in morning but bright sunshine in the afternoon. (ii) no rainfall in the area for a considerable time.
(iii) gathering of dust on the leaves.
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The plant which is kept in the dark is unable to carry out photosynthesis and hence the container would be filled with carbon dioxide within a short span of time
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