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प्रश्न
Keep some freshly cut flowers in a solution of food colour. Wait for sometime for the dye to rise in the flower, when the stem of the flower is held up in light, coloured strands can be seen inside. Can this experiment demonstrate which tissue is conducting water up the stem?
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उत्तर
Coloured strands represent the continuous column of water through the stem. We have seen that water molecules make continuous columns because of adhesion-cohesion. We have also seen that water moves through the xylem in plants. Hence, this experiment can demonstrate that xylem is conducting water up the stem.
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संबंधित प्रश्न
The loss of water in the form of water vapour through stomata on leaves is known as ___________.
Briefly explain, how transpiration helps in upward conduction of water in plants?
How does transpiration help the roots absorb water and minerals from the soil?
Define the term Transpiration stream
The diagram given alongside is an apparatus used to study a particular phenomenon in plants.
(i) Name the apparatus.
(ii) What is it used for?
(iii) What is the role played by the air bubble in this experiment?
(iv) Of what use is the reservoir?
Comment on the following statement:
A well-watered potted plant shows wilting of leaves on a hot sunny day.
Litmus paper is used to demonstrate transpiration from the leaves of the green plant.
A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. It was then set up as shown in the diagram and exposed to light for about 12 hours. At the end of this time, leaf x and y were tested for starch. Study the diagram and answer the questions that follow:
(i) Why was the plant initially kept in darkness for 24 hours?
(ii) What is the function of sodium hydroxide solution in the flask?
(iii) Select the correct leaf from the five available choices shown in the diagram as a, b, c, d and e. Rewrite the correct answer by filling in the appropriate letter for the questions that follow:
1. After the starch test, leaf x would look like ______.
2. After the starch test, leaf y would look like ______.
(iv) The experiment with leaf y shows that photosynthesis requires the presence of certain factors. Mention any one factor.
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
What is the purpose of putting oil in the test tube?
Stomata of a plant open due to ______.
______ involves evaporative loss of water from aerial parts.
Guard cells are responsible for the opening and closing of stomata.
Complete the following by choosing the proper option.
Stomata : Transpiration :: Hydathode : ____________.
Identify the wrong statement and correct it.
Leaves perform the function of transpiration only.
The lower surface of leaf will have more number of stomata in a ______.
A root hair is derived from ______ cell.
Name the structures through which Transpiration occur in a plant.
