Question

The diagrams given below represent the relationship between a mouse and a physiological process that occurs in green plants. Study the diagrams and answer the questions that follow:

1. Name the physiological process occurring in the green plant that has kept the mouse alive.
2. Explain the physiological process mentioned above.
3. Why did the mouse die in bell jar B?
4. What is the significance of the process as stated in (i) for life on earth?
5. Represent the above mentioned physiological process in the form of a chemical equation.

Answer 1

1. Photosynthesis
2. Photosynthesis is a physiological process by which plant cells containing chlorophyll produce food in the form of carbohydrates by using carbon dioxide, water and light energy. Oxygen is released as a by-product.
3. In bell jar B, the mouse suffocated and died because it was deprived of oxygen.
4. Photosynthesis can be said to be the food giver for all. Green plants synthesise their food by photosynthesis, and all other organisms are dependent on plants for their food directly or indirectly.
5. \[ 6\mathrm{CO_2} + 12\mathrm{H_2O} \xrightarrow[\ \text{Chlorophyll}\ ]{\ \text{Light energy}\ } \mathrm{C_6H_{12}O_6} + 6\mathrm{H_2O} + 6\mathrm{O_2} \uparrow \]