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Biology [3 marks Question Answer]

Photosynthesis · ICSE STD 10 (ICSE - English Medium). 7 questions.

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[3 marks Question Answer]

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7 questions · timed · auto-graded

Question 13 Marks
Differentiate between:
Photolysis and Photophosphorylation.
Answer
 PhotolysisPhotophosphorylation
 It is splitting of water in the   presence of sunlight. It is a process of formation of energy-rich compound ATP
 from ADP and inorganic phosphate utilising light energy.
 It involves following reactions :
 $\begin{array}{l}4 H _2 O \longrightarrow 4 H ^{+}+4( OH )^{-} \\ 4( OH ) \longrightarrow\end{array}$		 It involves following reaction :
 $ADP + Pi \longrightarrow ATP$
 Oxygen liberated is released in   the atmosphere. ATP acts as assimilatory powers to provide energy for dark   reaction.
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Question 23 Marks
Differentiate between:
Light reaction and Dark reaction
Answer
Light reactionDark reaction
 It takes place in the presence of light. It does not require light.
 It occurs in the thylakoid membranes of the grana. It occurs in the stroma.
 It is largely a photochemical change, requiring light   energy. It is a series of biochemical changes.
 Light energy is converted to chemical energy in the   form of ATP and NADPH_(2). Carbon dioxide is converted to carbohydrate
 (Glucose)
 
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Question 33 Marks
The diagrams given below is an experiment conducted to study a factor necessary for photosynthesis. Observe the diagrams and then answer the following questions :

Image
(i) What is the aim of the experiment?
(ii) Identify the special condition inside the flask.
(iii) In what manner do the leaves 1 and 2 differ at the end of the starch test?
Answer
(i) The aim of the experiment is to show that carbon dioxide is necessary for photosynthesis.
(ii) There is no $CO _2$ in the air (inside the flask). The flask is filled with KOH (potassium hydroxide) that absorbs all the $CO _2$ from the flask.
(iii) At the end of starch test, the leaf 1 will show no colour change and leaf 2 will turn blue-black.
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Question 43 Marks
The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet 'A' represents a certain condition inside the flask.
Answer
The figure given below represents an experiment to demonstrate a particular aspect of photosynthesis. The alphabet 'A' represents a certain condition inside the flask.

Image

(i) What is the aim of the experiment?
(ii) Identify the special condition inside the flask.
(iii) In what manner do the leaves 1 and 2 differ at the end of the starch test?
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Question 63 Marks
Given below is the diagram showing aquariums with light and without light. Read the information and fill in the blanks:

Image
A group of students conducted an experiment to understand the significance of photosynthesis in the ecosystem. They observed two aquariums, one with aquatic plants and the other without any plants, both exposed to light. Over time, they noticed that the aquarium with plants had clearer water, while the other became turbid. This experiment highlighted the role of photosynthesis in oxygen production and nutrient cycling, essential for maintaining aquatic ecosystems.
The presence of plants in the aquarium helped in (i) __________ the water by absorbing carbon dioxide. The unclear water in the aquarium without plants was due to the (ii) __________ of oxygen and the accumulation of waste. Photosynthesis is crucial for (iii) __________ as it produces oxygen and removes carbon dioxide. In the absence of photosynthesis, aquatic ecosystems would suffer from
(iv) __________ imbalance and poor water quality. The experiment demonstrated the importance of (v) __________ maintaining aquatic environments.
Answer
(i) clarifying, (ii) lack, (iii) ecosystems, (iv) oxygen, (v) photosynthesis
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