Chapter 6 Photosynthesis I

Scope of syllabus: The internal structure of chloroplast to give an idea of the site of light and dark reaction. Opening and closing of stomata , the importance of a correct balanced chemical equation. The term “photochemical” for light phase and “biosynthetic” for dark phase. In the light reaction, activation of chlorophyll molecule followed by photolysis, release of oxygen, formation of ATP and NADP. In the dark reaction(detailed equations not required), only combination of hydrogen released by NADP with carbon dioxide to form glucose. Adaptations in a plant for photosynthesis.

1) Introduction

2) Raw materials required for photosynthesis

3) Mechanism of photosynthesis:

  • a) Light or hill reaction or photochemical phase
  • b) Dark or Blackman’s reaction or biosynthetic phase

4) Formation of starch and other organic compounds.

5) Fate of end-products of photosynthesis

6) Transportation (translocation) of organic compounds in the plants

7) Adaptations in leaf for photosynthesis

8) External factors affecting photosynthesis

9) Significance of photosynthesis

10) Experiments

11) Key Points to remember: (Summary)

12) Key terms

13) BTT(Beyond the text): Extra Info.

14) Assignments:

  • 1) Objective type(1 mark each)
  • 2) Answer in one or two sentences (1 mark each)
  • 3) Give reasons (2 marks each)
  • 4) Short notes (2/3 marks each)
  • 5) Answer in detail (4/5 marks each)
  • 6) Board questions
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