(a) Draw a labelled diagram showing open and closed stomatal pore. (b) List the main events that occur during the process of photo-synthesis. (c) Write a balanced chemical equation showing photo-synthesis in plants.
Autotrophic nutrition and photosynthesis
High importanceUsually 3 marks a paper · mostly case-based questions and short answers · asked in 3 of the last papers
Notes are being written
The board questions below are real and complete — they come from the CBSE papers themselves. The written notes for this topic are still being prepared.
Board questions on this topic
6 from the CBSE papers we hold — the exact wording the board used.
[Case: Maintenance functions of all living organisms must go on continuously; these processes require energy obtained from food prepared by autotrophs (producers).] Name and define the process by which green plants prepare food.
[Case: Maintenance functions require energy from food prepared by autotrophs.] Write chemical equation involved in the above process (photosynthesis).
[Case: Maintenance functions require energy from food prepared by autotrophs.] State in proper sequence the events that occur in synthesis of food by desert plants.
[Case: Maintenance functions require energy from food prepared by autotrophs.] Explain giving reasons what happens to the rate at which the green plants will prepare food (I) during cloudy weather, and (II) when stomata get blocked due to dust.
(i) What is the internal energy reserve in plants and animals? (ii) How desert plants perform photosynthesis if their stomata remain closed during the day?