Photosynthesis

Appeared in 10 of the 11 available papers.

Examined in

10 of 11 papers

Appears almost every year — treat as core

Typically worth

7.8 marks

Average per paper it appears in · 78 marks in total

Usual form

Short answer

35% of this chapter's 66 questions

Needs a diagram

52%

34 questions carry a figure — practise drawing them

Question-type distribution

Short answer23
MCQ13
Reasoning11
Definition6
Diagram4
Differentiate3
Biological term2
Fill in the blanks2

Most frequent topics

Equation for photosynthesis 8Photosynthesis 6Result of the starch test 4Photophosphorylation 3NADP 2Chloroplast — diagram 2Destarching 2Destarching a plant 1

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Showing 25 of 66 matching questions (78 marks).

25 questions

The diagram given below represents an experiment to demonstrate a particular aspect of photosynthesis. The letter ‘A’ indicates a certain condition inside the flask. Answer the questions:

7(iii)2021

MCQHard1 mark

An alternative chemical that can be used instead of KOH is:

(a)Sodium hydroxide.
(b)Sodium chloride.
(c)Potassium chloride.
(d)Potassium permanganate.

7(iv)2021

MCQModerate1 mark

In what manner do the leaves 1 and 2 differ at the end of the starch test?

(a)Leaf 1 turns brown, Leaf 2 turns blue black.
(b)Leaf 1 turns blue black, Leaf 2 turns brown.
(c)Leaf 1 turns purple, Leaf 2 remains green.
(d)There is no change in the colour of the leaves.

7(v)2021

MCQModerate1 mark

What is the important step that should be taken before performing this experiment?

(a)The plant should be placed in dark for 24 hours to destarch the entire plant.
(b)The plant should be placed in dark for 24 hours to remove chlorophyll from the leaves.
(c)The plant should be placed in dark for 24 hours to destarch the leaves.
(d)The plant should be placed in dark for 24 hours for the roots to absorb water.

1(a)

Name the following:

1(a)(i)2020

Biological termModerate1 mark

The process of transformation of several glucose molecules into one molecule of starch.

1(b)

Explain the following terms:

1(b)(iii)2020

DefinitionModerate1 mark

Photolysis

2(a)

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

2(a)(i)2020

Short answerModerate1 mark

Which factor is being studied here?

2(a)(ii)2020

Short answerModerate1 mark

What is the purpose of keeping KOH in the flask?

2(a)(iii)2020

DefinitionModerate1 mark

Explain the term Photosynthesis.

2(a)(iv)2020

ReasoningModerate1 mark

What will you observe when the leaf A is tested for starch?

2(a)(v)2020

Short answerHard1 mark

Write a well balanced chemical equation for the process of photosynthesis.

3(b)

Give the biological reasons for the following statements:

3(b)(i)2020

ReasoningModerate1 mark

It is advisable to keep green plants in an aquarium.

1(c)

Give suitable biological reasons for the following statements:

1(c)(v)2019

ReasoningModerate1 mark

All life on Earth is supported by Photosynthesis.

1(g)

Expand the following biological abbreviations:

1(g)(iii)2019

Short answerEasy1 mark

ATP

2(b)

Mention the exact location of the following:

2(b)(iii)2019

Short answerHard1 mark

Thylakoids

3(a)

The diagram given below represents an experiment to prove the importance of a factor in photosynthesis (a leaf partly covered with black paper held by clips). Answer the questions that follow:

3(a)(i)2019

Short answerModerate1 mark

Name the factor studied in this experiment.

3(a)(ii)2019

ReasoningModerate1 mark

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

3(a)(iii)2019

DefinitionModerate1 mark

Explain the process of Photosynthesis.

3(a)(iv)2019

Short answerHard1 mark

Give a balanced chemical equation to represent the process of photosynthesis.

3(a)(v)2019

DiagramHard1 mark

Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.

Complete the following paragraph by filling in the blanks (i) to (v) with appropriate words:

Fill in the blanksModerate5 marks

To test a leaf for starch, the leaf is boiled in water to (i) __________. It is then boiled in methylated spirit to (ii) __________. The leaf is dipped in warm water to soften it. It is placed in a petri dish, and (iii) __________ solution is added. The region of the leaf which contains starch, turns (iv) __________ and the region which does not contain starch, turns (v) __________.

3(b)

A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagram and answer the questions: