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प्रश्न
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 leaf 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 the 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 for the filling in the appropriate letter from the questions that follow:
1. After the starch test, leaf X would look like.
2. After the starch test, leaf Y would look like.
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उत्तर
(i) The plant was kept in the dark to destarch the leaves.
(ii) Sodium hydroxide absorbs CO2 thereby making the flask CO2 free.
(iii) (1) C, (2) E
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संबंधित प्रश्न
A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagrams and answer the questions:
- What aspect of photosynthesis is being tested in the above diagram?
- Represent the process of photosynthesis in the form of a balanced equation.
- Why was the plant kept in the dark before beginning the experiment?
- What will be the result of the starch test performed on Leaf ‘A’ shown in the diagram? Give an example of a plant with variegated leaves
- Draw a neat labelled diagram of a chloroplast.
Name the following:
The part of chloroplast where the dark reaction of photosynthesis takes place.
State one important function of chloroplasts.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
PhotoLysis is the reaction which means the breaking up of water molecules.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Out of nine types of chlorophyll, chlorophyll ‘a’ and ‘b’ are most abundant.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Photosynthesis results in loss of dry weight of the plant.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
All the starch produced in a leaf remains stored in it for 2-3 weeks before it is used by other parts of a plant.
State the location:
Chlorophyll
Mention the significance of the following mineral:
Magnesium for green plants.
Define the following term:
Chloroplast
