Detailed Study:

Brief Revision:

Frequently Tested Topics:

  • Structure of Chloroplasts

  • Opening and Closing of Stomata

  • Phases of Photosynthesis

  • Experiments on Photosynthesis

  • Equation for Photosynthesis

  • Expansion of NADP

*Note that other aspects of the chapter are equally important.

Important Diagrams:

  • Structure of Chloroplast

  • Opening and Closing of Stomata

  • Experiments on Photosynthesis

  • Oxygen is evolved during Photosynthesis

  • Carbon Cycle

Important Past Questions:

  • Give biological reasons for:

i) All life on earth is supported by photosynthesis. (2011, 2019)

ii) All the food chains begin with green plants. (2018)

  • Choose the correct answer:

i) A plant is kept in a dark cupboard for about 48 hours before conducting any experiment on photosynthesis to:

A] Remove starch from the plant

B] Ensure the starch is not translocated from the leaves

C] Remove chlorophyll from the leaf of the plant

D] Remove starch from the experimental leaf


ii) NADP is expanded as:

A] Nicotinamide adenosine dinucleotide phosphate

B] Nicotinamide adenine dinucleotide phosphate

C] Nicotinamide adenine dinucleous phosphate

D] Nicotinamide adenosine dinucleous phosphate


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

i) Leaf and liver (form in which gluocse is stored)              (2018)

ii) NADP and ATP (expand the abbreviation)                       (2017)

iii) Stoma and stroma (describe its structure)                     (2012)

iv) Light reaction and dark reaction (site of occurrence)       (2010)

  • Mention the exact location of the following structures:

i) Thylakoids

ii) Lenticels


  • Rewrite the terms in the correct order so as to be in logical sequence:

Spongy cells, upper epidermis, stoma, palisade tissue, substomatal space


  • Expand NADP.

(2011, 2012, 2013, 2017)

  • Name the following:

i) The part of the chloroplast where the light reaction of photosynthesis takes place. (2011)

ii) A plant with sunken stomata. (2010)

  • Give the biological term for:

Process of conversion of several molecules of glucose to one molecule of starch.


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

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) ______.

(2011, 2018)

  • 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.

i) What aspect of photosynthesis was being tested?

ii) Why was the plant placed in the dark before beginning the experiment?

iii) During the starch test why was the leaf:

1) boiled in water

2) boiled in methylated spirit

iv) Write a balanced chemical equation to represent the process of photosynthesis

v) Draw a neat diagram of a chloroplast and label its parts.



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