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प्रश्न
Give suitable explanation for the following:
Cork and bark of trees help in preventing loss of water
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उत्तर
Cork and Bark of trees are tissues of old woody stems. Bark is thick with outermost layer made of dead cells and the cork is hydrophobic in nature. These properties make them water-proof and hence they prevent transpiration.
संबंधित प्रश्न
Give suitable explanation for the following:
Perspiration and transpiration help to cool the body temperature of the organism.
Give suitable explanation for the following:
On a bright sunny day, the leaves of certain plants roll up.
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Name the phenomenon being demonstrated.
Comment on the following statement:
A well-watered potted plant shows wilting of leaves on a hot sunny day.
Distinguish between the following :
Cuticular transpiration and lenticular transpiration
Litmus paper is used to demonstrate transpiration from the leaves of the green plant.
A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. It was then set up as shown in the diagram and exposed to light for about 12 hours. At the end of this time, leaf x and y were tested for starch. Study the diagram and answer the questions that follow:
(i) Why was the plant initially kept in darkness for 24 hours?
(ii) What is the function of sodium hydroxide solution in the flask?
(iii) Select the correct leaf from the five available choices shown in the diagram as a, b, c, d and e. Rewrite the correct answer by filling in the appropriate letter for the questions that follow:
1. After the starch test, leaf x would look like ______.
2. After the starch test, leaf y would look like ______.
(iv) The experiment with leaf y shows that photosynthesis requires the presence of certain factors. Mention any one factor.
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Suggest a suitable control for this experiment.
Excessive transpiration is due to ______.
