Photosynthesis in Higher Plants Class 11 Notes - Chapter 13

Introduction

Photosynthesis is a process by which plants create their own food by using sunlight. This process was first seen more than 3.4 billion years ago in organisms that were similar to bacteria. Evidence showed that they did not absorb visible light, instead, they used near-infrared and produced sulphur or sulphate compounds. It would be another 470 million years until the first land plants emerged.

Joseph Priestley Experiment

He enclosed a mouse within a bell jar and after a while, the mouse apparently died. He replicated the same experiment with a burning candle and eventually, the flame was extinguished. But when the repeated the above experiment with a mint plant, the mouse survived and the flame sustained. This outcome led Priestley to conclude that plants contribute to the production of oxygen.

Where Does Photosynthesis Take Place?

Essentially, this process takes place inside a plant cell organelle called the chloroplast. These organelles are found in the mesophyll layer, which is basically two layers of cells present inside the leaves of the plant.

Questions on Photosynthesis in Higher Plants

  1. Explain the following in brief
    1. C3 Plants
    2. RuBisCO
    3. Photophosphorylation
  2. Is it possible to determine if a plant is C3 or C4 based on external appearance alone?
  3. Differentiate the anatomic differences between C3 and C4 plants.

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