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Given below is certain structure. Write against them its functional acivity.
Taste bud and …………………..
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Name the four principal tastes and the respective regions of the tongue concerned with their perception.
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Complete the following table by filling in the blank spaces.
| Structure | Function |
| Yellow Spot | |
| Transfers impulse from inner ear to brain | |
| Helps to change the focal length of the eye lens | |
| Spinal cord | |
| Oval window | |
| Dynamic equilibrium |
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Name the following :
(i) The layer of the eyeball that provides nourishment to the eye.
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Correct and rewrite the statements by changing the biological term that is underlined for the statement:
The kidney is composed of number of neurons.
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Answer the following questions briefly:
Explain how the human eye adapts itself to bright light and dim light.
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What is Parthenocarpy?
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Name the following:
The force developing in shoot responsible for most of the absorption of water.
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The diagram given alongside is an apparatus used to study a particular phenomenon in plants.
(i) Name the apparatus.
(ii) What is it used for?
(iii) What is the role played by the air bubble in this experiment?
(iv) Of what use is the reservoir?
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Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in front of a fan?
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Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in sunlight.
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Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in dark.
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Comment on the following statement:
A well-watered potted plant shows wilting of leaves on a hot sunny day.
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Distinguish between the following :
Cuticular transpiration and lenticular transpiration
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Litmus paper is used to demonstrate transpiration from the leaves of the green plant.
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The figure below represents the set-up at the start of certain experiment to demonstrate an activity of plants:
(i) What is the aim of the experiment?
(ii) Why has oil been put in each test tube?
(iii) What will be the observations in the two test-tubes after about 2-3 days?
(iv) Give reasons to explain any change observed as answered in (iii) above.
(v) Why has the test-tube b without the plant, been taken in the experiment?
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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 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 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 by filling in the appropriate letter for the questions that follow:
1. After the starch test, leaf x would look like ______.
2. After the starch test, leaf y would look like ______.
(iv) The experiment with leaf y shows that photosynthesis requires the presence of certain factors. Mention any one factor.
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Choose the correct answer:
More water loss in plants is the cause of wilting. This can be checked by ____________
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