Advertisements
Advertisements
प्रश्न
An outline sketch of a tree is shown in a diagram below. Study the same and answer the questions that follow:
- Name and define the phenomenon labelled A in the diagram.
- Write the significance of the process mentioned in A for the plants.
- What do the direction of the arrows in B and C indicate? Name the phenomena.
- Draw a neat and labelled diagram of an opened stomata.
उत्तर
- Transpiration, in plants, is the evaporative loss of water from aerial portions (leaves and stems).
- Significance of transpiration for the plants:
- Cooling effect
- Creating Suction force
- Distribution of water and minerals.
- Arrow B shows water rising up the trunk, and the phenomenon is lenticular transpiration in the ascent of sap.
Endosmosis is the phenomenon whereby arrow C denotes water absorbed by roots from the earth. 
संबंधित प्रश्न
Transpiration pull will be maximum under which set of the following conditions?
Given below is an example of a certain structure and its special functional activity:
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Thick cuticle and ………………………..
Which of the following statements are true and which ones are false? Give reason in support of your answer.
Hydathodes are similar to stomata in plant physiology.
Why are the stomata in most plants more numerous on the lower surface of a leaf instead of being on the upper surface?
The diagram alongside represents a structure found in a leaf. Study the same and answer the questions that follow:
(i) Name the parts labeled A and B.
(ii) What is the biological term for the above structure?
(iii) What is the function of the part labeled A?
(iv) Mention two structural features of A, which help in the function mentioned in (iii) above?
(v) Where is this structure likely to be found in a leaf?
(vi) The structure (fig.5.22) helps in the process of transpiration. Explain the term transpiration.
(vii) How many other cells are found surrounding this structure as seen in the diagram?
Briefly explain how the rate of transpiration is affected by:
Humidity of the atmosphere
What are lenticels? Where are they found?
Explain the Term
Transpiration
Complete the following sentence with appropriate word:
The leaves of the __________ plants have cuticular wax.
