Advertisements
Advertisements
प्रश्न
The apparatus shown here is Girreau’s poto-meter designed to demonstrate unequal transpiration from the two surfaces of a dorsiventral leaf. Before keeping the leaf in between the cups, anhydrous calcium chloride (CaCl2) contained in two small vials were weighed and placed in both the cups. The ends of the cups were closed with corks through which two mercury manometers were connected. After a few hours, CaCl2 vials were taken out and weighed again.
(i) What is the purpose of keeping CaCl2 vials inside the cup?
(ii) After a few hours, the CaCl2 vials were taken out and weighed again. Will you expect any difference in weight? If so, give reasons.
(iii) What was the purpose of using a mano-meter?
(iv) What do you mean by transpiration?
Advertisements
उत्तर
(i) The CaCl2 vials are kept inside the cup to absorb water.
(ii) After few hours, the weight of the CaCl2 vials will increase because they will absorb the water which is transpired by the leaf of the plant.
(iii) Manometers are used to indicate the unequal transpiration from two surfaces of a dorsiveritral leaf by showing difference in rise in their mercury levels.
(iv) Transpiration is the loss of water in the form of water vapour from the aerial parts of the living plants.
APPEARS IN
संबंधित प्रश्न
Give Reasons for the following:
Guard cells are small in size and are kidney-shaped in outline.
The diagram below represents a structure found in a leaf.
Study the same and answer the questions that follow:
(i) Name the pis 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 above structure 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?
Draw a labeled diagram of the stomatal apparatus and label the following in it: Stoma, Guard cells, Chloroplast, Epidermal cells, and Cell wall.
State the Location:
Stomata
Write a short note on lenticular transpiration.
When guard cells are flaccid, the stoma must be ______.
Give a reason/suitable explanation.
More transpiration occurs from the under surface of a dicot leaf.
Give a reason/suitable explanation.
Leaves of some plants wilt during midday and recover in the evening.
Given below is the figure of a stoma. Study the same and answer the following questions:
- Label the guidelines A and B.
- Write the exact location of the above-mentioned structures.
- Mention one important role of structure A.
- Write three important roles for structure B.
- Redraw the same figure when structures A are in flaccid condition. When does the flaccid condition occur?
