Biology
Given below is the figure of a stoma. Study the same and answer the following questions:
(a) Label the guidelines A and B.
(b) Write the exact location of the above mentioned structures.
(c) Mention one important role of structure A.
(d) Write three important roles of structure B.
(e) Redraw the same figure when structures A are in flaccid condition. When does flaccid condition occur ?
Transpiration
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Answer
(a) The guidelines A and B are:
- A → Guard cells
- B → Stoma
(b) Most of them are found under the leaf i.e. abaxial side of leaf.
(c) It regulates the opening and closing of the stomata.
(d) Three important roles of structure B are:
- Transpiration.
- Intake of carbon dioxide for photosynthesis.
- Respiration.
(e) The flaccid condition occurs when there is less absorption of water. In such condition the cells lose their turgidity and the stomata closes.
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Given ahead is the diagram of an experimental set up to study the process of transpiration in plants. Study the same and then answer the questions that follow:
(a) Name the colour of dry cobalt chloride paper.
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(c) Why are glass slides placed over the dry cobalt chloride papers?
(d) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? Give a reason to support your answer.
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:
(a) Name the process being studied.
(b) Explain the process named above in (a).
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(d) Suggest a suitable control for this experiment.
(e) Mention two ways in which this process is beneficial to plants.
(f) List three adaptations in plants to reduce the above mentioned process.
An outline sketch of a tree is shown in a diagram below. Study the same and answer the questions that follow:
(a) Name and define the phenomenon labelled A in the diagram.
(b) Write the significance of the process mentioned in A for the plants.
(c) What do the direction of arrows in B and C indicate? Name the phenomenon.
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