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Question
Given below is the representation of a certain phenomenon in nature. With four organisms 1-4.

Name the biological process which was the starting point of the whole chain.
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Solution
Photosynthesis
RELATED QUESTIONS
Describe fully one experiment with potted green plant to show that starch is not produced in the leaves when carbon dioxide is not available (diagrams essential)
Two healthy green plants were placed in the dark for 24 hours. They were then set up, as shown in the figure, for 4 hours. Then a leaf was taken from each plant and
the chlorophyll was removed from the leaves:
( i) What is the next and final step in this experiment?
( ii ) What would be the results of the final step?
( iii ) Why was it necessary to grease the glass sheet?
( iv ) What hypothesis is being tested in this experiment?

Complete the following statement by choosing the correct alternative given below :
All animals would die on the earth if there was no ______.
Mention one difference between the following on the basis of what is given in bracket.
Chlorophyll and chloroplast (part of plant cell)
How do non-green plants such as fungi and bacteria obtain their nourishment?
Given alongside is the diagram of an experimental set-up:

- What is the objective of this experiment?
- Will it work satisfactorily? Give reason.
- What alteration(s) will you make in it for obtaining expected result?
- Would you take any steps before starting the experiment? Describe this step and explain its necessity.
ATP is needed for the dark reaction.
Complete the following sentence with appropriate word:
________ are regarded as complete photosynthetic units of plants.
