A student wanted to see if covering a leaf in foil would stop it from producing starch. Why should the student put the plant in
a dark cupboard for 48 hours before returning it to the light and starting the experiment? 1. To make the results reliable
2. So that the plant would photosynthesise faster when returned to the light
3. So that any starch already in the leaf was used up by the plant
4. He did that simply
Putting the plant in dark for 48 hours would stop the process of photosynthesis as light is required for it. Photosynthesis produces organic sugars which are stored in form of starch in plants. The absence of photosynthesis would lead to the consumption of all stored starch making the leaf starchless. The correct answer is option D.
The species c, was more closely related to species a than species b was. This is because species a and c just recently evolved into different species in evolutionary history.
