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प्रश्न
What are stomata?
उत्तर
The microscopic structures found in the leaves of plants that allow the diffusion (exchange) of gases are called stomata or pores. This stomatal system is an open space or pore surrounded by two epidermal guard cells and many subsidiary cells. The cells (guard cells) control the process of closing or opening stomata.
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संबंधित प्रश्न
Define the termTranspiration
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.
Give the importance of transpiration?
Transpiration is a necessary evil in plants. Explain.
Transpiration takes place through ______.
Describe briefly the three physical properties of water which helps in ascent of water in xylem.
Do different species of plants growing in the same area show the same rate of transpiration at a particular time? Justify your answer.
Water molecule is very polar. Polar end of molecule attracts opposite charges on another water molecule (acts like magnet). How will you explain this property of water with reference to upward movement of water? Comment on the upward movement of water given the intermolecular hydrogen bonding in water.
Observe the following diagram and identify the process and its significance from the following options:
Define the following term:
Wilting
