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Biology [2 Mark Question Answer]

Photosynthesis · ICSE STD 10 (ICSE - English Medium). 10 questions.

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[2 Mark Question Answer]

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Question 12 Marks
A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
Write a balanced chemical equation to represent the process of photosynthesis.
Answer
Chemical equation for the process of photosynthesis:
$\ce {6CO_2 + 12H_2O ->[Light energy][chlorophyll] C_6H_12O_6 + 6H_2O + 6O_2}$
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Question 22 Marks
A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.

During the starch test, why was the leaf

(1) boiled in water

(2) boiled in methylated spirit

Answer

(1) The leaf was boiled in water to destroy enzymes so that further chemical changes do not take place in the leaf.

(2) The leaf was boiled in methylated spirit to dissolve chlorophyll.

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Question 32 Marks
Photosynthesis in green plants is directly and indirectly dependent on so many plant structures.
Explain briefly the role of the following structures in this process is Stomata.
Answer
Stoma: The main function of stoma is to let in carbon dioxide from the atmosphere for photosynthesis. Also most of the oxygen produced during photosynthesis diffuses out into the atmosphere through the stomata.
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Question 42 Marks
Photosynthesis in green plants is directly and indirectly dependent on so many plant structures.
Explain briefly the role of the following structures in this process is Mesophyll cells
Answer
Mesophyll cells: Mesophyll cells are the main sites for photosynthesis. Chloroplasts are mainly contained in the mesophyll cells. When sunlight falls on the leaf, the light energy is trapped by the chlorophyll of the upper layers of mesophyll, especially the palisade cells.
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Question 52 Marks
Why is it not possible to demonstrate respiration in a green plant kept in sunlight?
Answer
If a green plant is kept in bright light, it tends to use up all the $CO_2$ produced during respiration, for photosynthesis. Thus, the release of $CO_2$ cannot be demonstrated. Hence, it is difficult to demonstrate respiration as these two processes occur simultaneously.
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Question 62 Marks
Mention one difference between the following on the basis of what is given in bracket.
Chlorophyll and chloroplast (part of plant cell)
Answer

Chlorophyll

Chloroplast


Chlorophyll is the green pigment present in cell organelles called chloroplasts.
Chloroplasts are cell organelles, situated in the cytoplasm of plant cells. They are present mainly in the mesophyll cells and in the guard cells of stomata.

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Question 72 Marks
Mention one difference between the following on the basis of what is given in bracket.
Grass and grasshopper (mode of nutrition)
Answer

Grass

Grasshopper


Green grass being a producer is capable of producing its own food by photosynthesis.
Grasshopper is a primary consumer (herbivore) and directly feeds on producers like grass.
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Question 82 Marks
Mention one difference between the following on the basis of what is given in bracket.
Producers and consumers (mode of nutrition)
Answer

Producers

Consumers


Producers show autotrophic mode of nutrition i.e. they are able to produce their own food from basic raw materials.
For example: green plants
Consumers show heterotrophic mode of nutrition i.e. they depend directly or indirectly on the producers for their food.
For example: Animals
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Question 92 Marks
Mention one difference between the following on the basis of what is given in bracket.
Light and dark reactions (products formed)
Answer

Light Reaction

Dark Reaction


Hydrogen and oxygen are produced here, along with release of electrons, which converts ADP into ATP.
Glucose is the main product formed during dark reaction.
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Question 102 Marks
Mention one difference between the following on the basis of what is given in bracket.
Respiration and photosynthesis (gas released)
Answer

Respiration

Photosynthesis


The gas released during respiration is carbon dioxide.
The gas released during photosynthesis is oxygen.
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[2 Mark Question Answer] - Biology STD 10 Questions - Vidyadip