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प्रश्न
उत्तर
Light intensity is directly proportional to sunlight. Increase in intensity of light increases the rate of photosynthesis. Photosynthesis is maximum in red light followed by blue light and is least in green light.
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संबंधित प्रश्न
Give biological reasons for the following statements : In some xerophytes leaves are modified into spines
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions:
(i) Name the process intended for study.
(ii) Define the above mentioned process.
(iii) When the weight of the test tube (A & B) is taken before and after the experiment, what is observed? Give reasons to justify your observation in A & B.
(iv) What is the purpose of keeping the test tube B in the experimental setup?
Complete the following paragraph by filling in the blank (1) to (5) with appropriate words:
To test a leaf for starch, the leaf is boiled in water to (1) _________. It is then boiled in Methylated spirit to (2) ________. The leaf is dipped in warm water to soften it. It is placed in a petri dish, and (3) _____ solution is added. The region of the leaf which contains starch, turns (4) ________and the region while does not contain starch, turns (5) __________.
How does carbon dioxide return to the atmosphere? Explain.
A student in order to study the importance of certain factors of photosynthesis took a potted plant and kept it in the dark for over 24 hours. Then in the early hours of the morning the student covered one of the leaves with black paper in the centre only. Student placed the potted plant in the sunlight for a few hours, and then tested the leaf which was covered with black paper for starch.
(i) What aspect of photosynthesis was being investigated?
(ii) Is there any control in this experiment? If so, state the name.
(iii) Why was the plant kept in the dark before the experiment?
(iv) Describe step by step how the candidate proceeded to test the leaf for the presence of starch.
Choose the correct answer:
Which one of the following is the best reason for leaving a plant in a dark place before carrying out experiments on photosynthesis?
During photosynthesis, the oxygen in glucose comes from
Mention one difference between the following on the basis of what is given in bracket.
Grass and grasshopper (mode of nutrition)
Are the following statement true or false? Give a reason in support of your answer.
The rate of photosynthesis continues to rise as long as the intensity of light rises.
Give some adaptations in green leaf photosynthesis.
What is meant by the photolysis of water?
Oxygen given out during photosynthesis comes from water. Explain this statement.
Respiration is said to be the reversal of photosynthesis.
Draw a neat and well-labeled diagram of the apparatus you would set up to show that oxygen is given out during photosynthesis.
Complete the following sentence with appropriate word:
A plant that does not perform photosynthesis is _______.
Complete the following sentence with appropriate word:
4OH ——> _____ + O2
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Photosynthesis can also occur n artificial light such as that of a 100-watt electric lamp.
Write the functional activity of the following structure:
Chloroplasts
Mention four factors required for photosynthesis?
