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प्रश्न
Describe an experiment to prove that sunlight is necessary for photosynthesis.
उत्तर
Experiment to prove that sunlight is necessary for photosynthesis:
a. A potted plant is kept in the dark for two days to destarch the leaves.
b. A part of a leaf is covered with a black paper by clip.
c. Now the plant is kept in the light for few hours.
d. The leaf is plucked and is boiled in water and is then decolourized with
alcohol.
e. The portion of leaf which received light turns blue with iodine because
photosynthesis took place in that part of leaf.
f. The part of leaf which was covered with black paper remains colourless
because photosynthesis could not take place in the absence of sunlight.
APPEARS IN
संबंधित प्रश्न
Formalin, Iodine, DDT, Lime
Give appropriate biological/technical terms for the following:
An apparatus that measures the rate of water uptake in a cut shoot due to transpiration.
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?
Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow :
(ii) Name the tropic movement shown by part 1.
The following statement is about photosynthesis in a green plant. Write whether it is True or False.
The raw materials for photosynthesis include water and carbon dioxide.
Identify the false statements and rewrite them correctly by changing the first or last word only.
Immediate product of photosynthesis is glucose.
Identify the false statement and rewrite it correctly by changing the first or last word only.
Green plants are consumers.
What is the importance of photosynthesis in the life of the following:
Non-green plants
Complete the following food chain by writing the names of appropriate organisms in the blanks:
__________ → Mouse → _________ → Peaock
The figure given below is for performing an experiment on photosynthesis.
Answer the following:
(i) What is the aim of this experiment?
(ii) Describe an experiment to show that light is necessary for photosynthesis.
(iii) What do you conclude from this experiment?
(iv) What is the role of light in photosynthesis?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
A variegated leaf (one that has green as well as white patches) will only photosynthesize in the green areas.
Fill in the blank by rearranging the letter in the bracket.
During photosynthesis plants releases _________ (egxyno).
Where does the carbon that is used in photosynthesis come from?
Where do the light-dependent reaction and the Calvin cycle occur in the chloroplast?
Oxygen is used for the synthesis of protein and fertilizers.
Read the following sentences about photosynthesis.
- Sunlight, carbon dioxide, chlorophyll and water are necessary.
- Oxygen is absorbed.
- Leaves carry out photosynthesis.
- Proteins are made during photosynthesis.
Choose the correct pair of sentences that are true to photosynthesis.
The minerals like nitrogen, potassium, and phosphorus, which are required in substantial quantity by the plants are called ______.
In leaves, the food is stored in the form of ______.
