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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.
APPEARS IN
संबंधित प्रश्न
Mention whether the following statement is true or false. Correct the false statement by altering the last word only.
Xylem is the water conducting tissue in plants.
Mention whether the following statement is true or false. Correct the false statement by altering the last word only.
The cell wall of the root cell is a differentially permeable membrane.
Given below is the diagrammatic representation of the transverse section of a part of a plant. Study it and answer the questions that follow:
(a) Name the part of the plant that is shown
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(c) Write the functions of parts 3 and 5
The apparatus arranged alongside signifies an important process.
(i) Name the process.
(ii) Where does this process occur in plants?
(iii) What solution is placed inside the dialysis tubing?
(iv) What happens to the level of the solution in the capillary tube?
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.
Three plants (a), (b) and (c) were placed in beakers containing coloured water. The water in each beaker was covered with a layer of oil. The leaves were removed from plant (b), while plant (c) was exposed to strong light.
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(ii) In which plant (a), (b) or (c), would the water move up slowly?
(iii) Why was the water covered with a layer of oil?
(iv) What is being investigated by this experiment?
Draw a diagram of the root hair cell as it would appear when a concentrated solution of fertilizers is added near it.
The figure given below is a diagrammatic representation of a part of the cross-section of the root in the root hair zone. Study the same and then answer the questions that follow :
(i) Name the parts indicated by guidelines ‘1’ to ‘5’
(ii) Is the root hair cell unicellular or multi-cellular?
(iii) Draw a labeled diagram of the root hair cell as it would appear if some fertilizer is added to the soil close to it.
(iv) Name the process responsible for the entry of water molecules from the soil into A1 and then A2.
(v) What pressure is responsible for the movement of water in the direction indicated by arrows?
(vi) How is this pressure set up?
Name the following:
Name the process by which intact plants lose water in the form of droplets.
Identify labels x, y, z in the given figure of root showing different regions.
