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Question 11 Mark
Name the following:
The tissue that transports manufactured type of starch from leaves to all parts of the plants.
Answer
Phloem
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Question 21 Mark
Name the following:
The part of chloroplast where the dark reaction of photosynthesis takes place.
Answer
Stroma
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Question 31 Mark
Name the following:
The source of carbon dioxide for aquatic plants.
Answer
Carbon dioxide dissolved in water
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Question 81 Mark
Name the following:
The category of organisms that prepare their own food from basic raw materials.
Answer
Producers / Autotrophs
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Question 91 Mark
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.
Why was the plant placed in the dark before beginning the experiment?
Answer
Before beginning the experiment, the plant was kept in dark in order to destarch it, i.e. to remove the pre-existing starch from the storage organs.
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Question 101 Mark
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.
What aspect of photosynthesis was being tested?
Answer
Light is required for photosynthesis.
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Question 111 Mark
Given alongside is the diagram of an experimental set-up:

What alteration (s) will you make in it for obtaining expected result?
Answer
Place potassium hydroxide in the beaker instead of lime water.
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Question 121 Mark
Given alongside is the diagram of an experimental set-up:

Will it work satisfactorily? Given reason.
Answer
No, the experiment will not work satisfactorily, as the beaker contains lime water and not potassium hydroxide to absorb $CO_2$.
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Question 131 Mark
Given alongside is the diagram of an experimental set-up:

What is the objective of this experiment?
Answer
To demonstrate the importance of carbon dioxide in photosynthesis.
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Question 141 Mark
Given below is the representation of a certain phenomenon in nature. With four organisms 1-4.

Name one natural element which all the organisms 2-4 and even 5 are getting from No. 1 for their survival.
Answer
Carbon
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Question 151 Mark
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.
Answer
Photosynthesis
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Question 161 Mark
Given below is the representation of a certain phenomenon in nature. With four organisms 1-4.

Name any one organism that could be shown at No .5
Answer
Hawk, eagle
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Question 171 Mark
Given below is the representation of a certain phenomenon in nature. With four organisms 1-4.

Name the phenomenon represented.
Answer
Food chain
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Question 181 Mark
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 Cuticle.
Answer
Cuticle: Cuticle is transparent and water proof due to which light can penetrate this later easily.
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Question 191 Mark
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 Guard cells.
Answer
Guard cells: They regulate the opening and closing of stomata and thus regulate the entry of carbon dioxide through the stomata.
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Question 201 Mark
A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
Why was the plant kept in the dark before the experiment?
Answer
Destarching ensures that any starch present after the experiment has been formed under experimental conditions. Therefore, the plant was kept in the dark before the experiment.
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Question 211 Mark
A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
Is there any control in this experiment? If so, state it.
Answer
Yes. The other uncovered leave of the potted plant act as a control.
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Question 221 Mark
A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
What aspect of photosynthesis was being investigated?
Answer
The student wanted to show that sunlight is necessary for photosynthesis. / The role of sunlight in photosynthesis is being investigated.
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Question 231 Mark
Given below are five terms. Rewrite the terms in the correct order so as to be in logical sequence with regard to photosynthesis: (i) water molecules, (ii) oxygen, (iii) grana, (iv) hydrogen and hydroxyl ions, (v) photons.
Answer
Photons, grana, water molecules, hydrogen and hydroxyl ions, oxygen
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Question 251 Mark
Explain the Term :
Carbon cycle
Answer
Carbon cycle: The various processes resulting in the circulation of carbon in different forms to the earth and then back into the atmosphere constitute the carbon cycle.
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Question 261 Mark
Explain the Term :
Photophosphorylation
Answer
Photophosphorylation : The phosphorylation of ADP to form ATP in the chloroplast during the light dependent reaction of photosynthesis is called photophosphorylation.
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Question 271 Mark
Explain the Term :
NADP
Answer
NADP (Nicotinamide Adenine Dinucleotide Phosphate) : It is a coenzyme which acts as a reducing agent in certain anabolic reactions. During electron transfer, NADP gains electron from hydrogen and get reduced to NADPH2.
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Question 281 Mark
Explain the Term :
Phosphorylation
Answer
Phosphorylation: The phosphorylation is a biochemical process which involves covalent attachment of a phosphate group to an organic molecule.
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Question 291 Mark
Explain the Term :
Photosynthetic membrane
Answer
Photosynthetic membrane : Photosynthetic membrane which is also known as the thylakoid membrane, is a bilayer of lipid molecules in which proteins are embedded. It is a site of light reaction of photosynthesis during which light energy is converted into chemical energy.
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Question 301 Mark
Explain the Term :
Photosynthesis
Answer
Photosynthesis : The physical and chemical process for plants by which certain chlorophyll containing organisms use light energy for the biosynthesis of organic molecules.
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Question 311 Mark
Explain the Term :
Plastoquinone
Answer
Plastoquinone : It is a small molecule involved in electron and proton transfer in photosynthesis.
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Question 321 Mark
Explain the Term :
NADPH
Answer
NADPH : It is a reduced form of nicotinamide adenine dinucleotide phosphate (NADP+), and a small water soluble molecule that acts as a hydrogen carrier in biochemical reactions.
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Question 331 Mark
Explain the Term :
Free energy
Answer
Free energy : The amount of energy available to do work in a biochemical reaction.
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Question 341 Mark
Explain the Term :
ATP
Answer
ATP : Adenosine triphosphate is a complex organic molecule that acts as an energy currency of the cells.
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Question 391 Mark
Name the Following :
Name the experiment to demonstrate the importance of light for photosynthesis.
Answer
Light screen experiment
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Question 401 Mark
Name the Following :
The part of the chloroplast where the dark reaction of photosynthesis takes place.
Answer
Stroma
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Question 411 Mark
Name the Following :
Tissue that transports manufactured starch from the leaves to all parts of the plant.
Answer
Phloem
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Question 421 Mark
Name the Following :
Breaking down of water molecule into its constituent components using light.
Answer
Photolysis
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Question 441 Mark
Name the Following :
Form of energy which is converted into chemical energy during photosynthesis.
Answer
Radiant energy
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Question 461 Mark
Name the Following :
Process responsible for the conversion of solar energy to chemical energy in order to sustain life on this earth.
Answer
Photosynthesis
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Question 471 Mark
Name the Following :
The form of energy into which the radiant energy gets converted during the process of photosynthesis.
Answer
Chemical energy
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Question 501 Mark
Name the Following :
The part of the chloroplast where the dark reaction of photosynthesis takes place.
Answer
Stroma
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[1 Mark Question Answer] - Biology STD 10 Questions - Vidyadip