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प्रश्न
What is meant by photosynthesis? Why is it so important in nature?
उत्तर
Photosynthesis: It is an anabolic process by which plants manufacture
carbohydrates or food material with the help of water and carbon dioxide in the
presence of sunlight and chlorophyll.
It is an important process as:
a. It produces food directly or indirectly for all living organisms on earth.
b. It maintains balance between oxygen and carbon dioxide in the atmosphere.
APPEARS IN
संबंधित प्रश्न
Give biological reasons for the following statements : In some xerophytes leaves are modified into spines
The following diagram demonstrates a physiological process taking place in green plants. The whole set up was placed in bright sunlight for several hours. Study the diagram and answer the questions that follow
(i) What aspect of the physiological process is being examined?
(ii) Explain the physiological process mentioned in (i) above.
(iii) Label the parts numbered 1 and 2 in the diagram.
(iv) Write a well-balanced chemical equation for the physiological process explained in (ii) above.
(v) What would happen to the rate of bubbling of the gas if a pinch of sodium bicarbonate is added to the water in the beaker? Explain your answer.
Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow :
Part 1 is affected by two stimuli. Name them. Which one of the two is stronger? 
Part 1 is affected by two stimuli. Name them. Which one of the two is stronger?
Mention the exact location of the following :
Thylakoids
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow :
What will you observe in the experimental leaf after the starch test?
State the main functions of the following:
Medulla Oblongata
Are the following statement true or false? Give a reason in support of your answer.
If you immerse a leaf intact on the plant in ice cold water, it will continue to photosynthesise in bright sunshine.
Complete the following food chains by writing the names of appropriate organisms in the blanks:
______ → Mouse ______ → Peacock
A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
Why was the plant kept in the dark before the experiment?
Name the molecules which are called assimilatory power? Why are they called so?
Photosynthesis is considered as a process supporting all life on earth.
Choose the Correct Answer:
NADP is expanded as
To which directional stimuli do
- roots respond
- shoots respond?
______ is ATP factory of the cells.
Mesophyll contains chlorophyll.
Sunflowers open the petals in bright light during the daytime but close the petals in dark at night. This response of sunflowers is called ______.
Study the pictures below and then complete the table by putting a plus (+) if the shoot or root grows towards the stimulus and a minus (-) if it grows away from it.
| Stimulus | Light | Gravity |
| Shoot | + | - |
| Root | ? | + |
Give an example for micronutrients.
Label the diagram with the raw materials and products of photosynthesis.
