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The Leaf Turns Blue Black Except in the Covered Region. as the Region Didnot Receive Light, Photosynthesis Did Not Occur. Hence No Starch Was Formed There. the Uncovered Region - Biology

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प्रश्न

The diagram given below represents an experiment to prove the importance of a  factor in photosynthesis. Answer the questions that follow :

 What will you observe in the experimental leaf after the starch test? 

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उत्तर

The leaf turns blue black except in the covered region. As the region didnot receive light, photosynthesis did not occur. Hence no starch was formed there. The uncovered region received light and starch was formed there due to photosynthesis. 

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2018-2019 (March) Set 1

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संबंधित प्रश्‍न

Differentiate between the following pairs on the basis of what is indicated in the brackets.

Leaf and Liver [form in which glucose is stored]


Given below is an experiment setup to demonstrate a particualr tropic movement in germinating seeds. Study the diagram and answer the questions that follow : 

What is meant by ‘Positive’ and ‘Negative’ tropic movements in plants? 


Mention any two points in which photosynthesis and respiration in plants are opposite to each other.


An experiment was set up as shown in the figure alongside. Look at the figure and answer the following questions:
( i) What is the objective of this experiment?
( ii ) Which plant is used in this experiment?
( iii ) Which gas is evolved in this process?
( iv ) What will happen to the rate of evolution of this gas if a pinch of sodium
bicarbonate is added?
(v ) What will happen if the apparatus is kept in dark?


Photosynthesis stops to occurs at a temperature above 35oC. 

The following statement is about photosynthesis in a green plant. Write whether it is True or False.

A variegated leaf (one that has white as well as green patches) will only photosynthesize in the green areas.


Fill in the blank:
______ is the process which replenishes the atmospheric oxygen which the animal life consumes in respiration.


Match the terms of column I with those in column II: 

Column I  Column II 
(i) Stomata closed  (a) decomposers 
(ii) Autotrophs  (b) light reaction 
(iii) By-products of photosynthesis  (c) animals 
(iv) Photolysis  (d) during night 
(v) Bacteria and fungi  (e) green plants 
  ( f) oxygen 

Choose the correct answer:
In a typical leaf, photosynthesis occurs mainly in ___________


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.


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 Phloem tissue in the leaf veins.


What is the importance of photosynthesis in the life of the following:

Green plants


Give technical term:

The part of the chloroplast where the dark reaction of photosynthesis takes place.


Complete the following sentence with appropriate word:

A plant that does not perform photosynthesis is _______.


Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:

Photosynthesis can also occur n artificial light such as that of a 100-watt electric lamp.


Choose the correct option.

A cell that lacks chloroplast does not ______.


Answer the following question.

Explain why photosynthesis is considered the most important process in the biosphere.


The raw materials for photosynthesis are ______ and ______.


Define photosynthesis.


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