Advertisements
Advertisements
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
Advertisements
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
The diagram of an given below demonstrates a particular process in plants. Study the same and answer the questions that follow :
(i) Name the apparatus.
(ii) Which phenomenon is demonstrated by this apparatus?
(iii) Explain the phenomenon mentioned in (ii) above.
(iv) State two limitations of using this apparatus.
(v) What is the importance of the air bubble in the experiment?
(vi) Name the structures in a plant through which the above process takes place.
How does movement and absorption of water take place through the roots?
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.
How is root hair adapted for the absorption of water from the soil?
The diagram given below represents a plant cell after being placed in a strong sugar solution. Guidelines 1 to 5 indicate the following:
1. Strong sugar solution
2. Cell wall
3. Protoplasm
4. Large vacuole
5. Nucleus
Study the diagram and answer the questions that follow:
(i) What is the state of the cell shown in the diagram?
(ii) Name the structure which acts as a selectively permeable membrane.
(iii) If the cell had been placed in distilled water instead of strong sugar solution which feature would not have been present?
(iv) If the cell in the diagram possessed chloroplasts where would these be present?
(v) Name any one feature of this plant cell which is not present in animal cells.
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.
(i) In which plant, (a), (b) or (c) would the water move up the fastest?
(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?
Choose the correct answer:
Meaning of ascent of sap is ____________
Name the following:
The kind of cells that constitute the cortex of a root.
Roots of the plants absorb water from the soil through the process of ____________.
Water in the root enters due to ______.
