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20 questions · timed · auto-graded

Question 31 Mark
Name the following:
The main reaction by which the molecule of water is broken down by means of light.
Answer
Photolysis
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Question 41 Mark
Name the following:
Three organisms that cannot prepare their own food by photosynthesis.
Answer
Fungi, insects and animals.
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Question 71 Mark
Why is the upper surface of broad leaves greener than their lower surface?
Answer
It is because the upper surfaces of broad leaves are directly exposed to sunlight which leads to maximize the rate of photosynthesis.
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Question 91 Mark
What is the role of chlorophyll in green plant?
Answer
Chlorophyll is a green coloured pigment found in green plants. it absorbs light energy which is utilized for the formation of ATP and reduction of NADP during photosynthesis.
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Question 101 Mark
Mention two ways in which photosynthesis is useful to life.
Answer
Advantages of photosynthesis:
(a) To produce food for all the organisms on earth.
(b) Release oxygen which is a life supporting gas.
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Question 111 Mark
A healthy oat seeding in a pot is transferred from light to any airy but completely dark room. How would it differ from its original condition in appearance after about a week? Explain the difference.
Answer
The leaves of the oat plant will turn yellow and the seedling will die because photosynthesis will not take place.
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Question 121 Mark
Describe an experiment to prove that sunlight is necessary for photosynthesis.
Answer
$\ce{6CO2 + 12H2O ->[Sunlight][Chlorophyll] C6H12O6 + 6O2 + 6H2O}$
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Question 131 Mark
Define dark reaction.
Answer
Dark reaction - It is a reaction in photosynthesis which do not require light and occurs in the stroma of the chloroplast.
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Question 141 Mark
Define the following:
Photolysis in photosynthesis
Answer
Photolysis in photosynthesis - The process of splitting of water by sunlight during light reaction of photosynthesis is called photolysis in photosynthesis.
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Question 151 Mark
Define the following:
Light reaction
Answer
Light reaction - The reaction of photosynthesis which takes place in the presence of light is called light reaction.
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Question 161 Mark
Define the following:
Organic food
Answer
Organic food - The food that is produced by using methods that do not involve synthetic inputs such as synthetic pesticides and chemical fertilizers is called organic food.
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Question 171 Mark
Define the following:
Quantum
Answer
Quantum - Quantum are the discrete packets which stores energy and these particles can be changed from one form to another.
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Question 181 Mark
Define the following:
Plant pigments
Answer
Plant pigments - Plant pigments are a variety of different kinds of molecules present in plants that absorb certain wavelengths of light while reflecting others.
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Question 191 Mark
Mention two significant advantages of photosynthesis to the living world as a whole.
Answer
Advantage of photosynthesis :
  1. To produce food for all the organisms on earth .
  2. Release oxygen which is a life supporting gas .
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Question 201 Mark
Give the overall chemical equation of photosynthesis in green plants.
Answer
Chemical equation of photosynthesis :
$\ce{6CO2 + 12H2O->[Sunlight][Chlorophyll]C6H12O6 + 6O2 + 6H2O}$
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[1 Mark Question Answer] - Biology STD 10 Questions - Vidyadip