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प्रश्न
Study the diagram given below and answer the questions that follow:
- Name the process being studied in the above experiment.
- Explain the process mentioned in (a) above
- Why is oil placed over water?
- What do we observe with regard to the level of water when this set-up is placed in (1) bright sunlight, (2) humid conditions and (3) windy days?
- Mention any three adaptations found in plants to foster the process mentioned in (a) above
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उत्तर
- Transpiration
- The loss of water from aerial sections of the plant in the form of water vapour.
- Oil is poured on water to stop evaporation-induced water loss.
- When the configuration is set,
- Transpiration causes the amount of water to drop in strong sunlight quickly.
- In humid conditions, the water level doesn't change much as the rate of transpiration decreases.
- The water level drops quickly during transpiration on a windy day.
- Leaves have morphological adaptations to control their transpiration rate, as follows:
- Thick cuticle: A quite thick cuticle could cover the leaves, e.g., banyan.
- Loss of leaves: As in cactus, some plants have leaves lost or absent.
- Narrow leaves: In order to decrease the surface area for transpiration, certain plants, such as Nerium, develop narrower leaves.
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संबंधित प्रश्न
The figure shows a diagrammatic representation of the movement of certain substances inside the stem of a certain plant. Write five sentences on whatever you can explain about the processes or the arrangement of structures indicated in the diagram.
Note: - Each sentence must include one or more of the following four words, and each word can be used several times. Xylem, phloem, roots, leaves.
The diagram given below represents the results of an experiment conducted on two freshly taken leafy shoots of a herbaceous plant. The lower ends of the shoots dip in ordinary water.
(i) What is the aim of the experiment?
(ii) Some parts of the stem in both the shoots have been removed. Name the conducting tissue in shoot (a) and in shoot (b) that has been removed.
(iii) What are the results of this experiment?
Mention whether the following statement is true (T) or false (F) and give an explanation in support of your answer.
Guttation in plants occurs maximum at midday.
Study the experimental setup in the figure and then answer the question that follow.
What is meant by 'semipermeable membrane'?
Root hairs become flaccid, when fertilizers are added to the moist soil around it. Explain.
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Diffusion | (a) The exit or flow of water from the cell to the outer environment. |
| (ii) Xylem | (b) The shrinkage of protoplasm when the cell is kept in a hypertonic solution. |
| (iii) Root pressure | (c) The tissue through which water and mineral salts move upward in a plant. |
| (iv) Isotonic solution | (d) Two solutions which have equal osmotic pressure. |
| (v) Exosmosis | (e) The process by which the molecules of perfume spread in the room when the bottle is open. |
| (vi) Osmosis | (f) The process by which roots absorb water from the soil. |
| (vii) Plasmolysis | (g) The pressure by which water rises up to some feet in a lofty tree. |
| (viii) Hypotonic solution | (h) The concentration of the solution when lower than that of the cell sap. |
Write a note on the morphological structure of the root.
How many regions are there in a typical root?
Water in the root enters due to ______.
