A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagram and answer the questions: A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagram and answer the questions:
What aspect of photosynthesis is being tested in the above diagram?
Topic: Chlorophyll is necessary
Answer
That CHLOROPHYLL is NECESSARY for photosynthesis.
The clue is the word VARIEGATED. A variegated leaf has GREEN parts (containing chlorophyll) and PALE YELLOW parts (without it), growing on the SAME leaf under identical conditions of light, carbon dioxide, water and temperature.
That makes it a perfectly controlled experiment: only ONE factor differs between the two areas — the presence of chlorophyll — so any difference in the result must be due to it.
THE METHOD for every photosynthesis experiment, since ICSE recycles them constantly — find the ONE thing removed: VARIEGATED leaf — removes CHLOROPHYLL BLACK PAPER over part of a leaf — removes LIGHT KOH in a flask — removes CARBON DIOXIDE HYDRILLA under a funnel — collects the OXYGEN released