1. What is stimulus? 2. Define response.

3. What are tropic movements
4. What excretory products are produced in plants?

5. When do stomata open and close?
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1.someting that causes directly, development, interest.

2.an answer to somebody something

3.directional movement of particular part of a plant in response to environmental stimuli

4. carbon dioxide, oxygen

5. allow for the uptake of carbon dioxide anf to limit the loss of water due to evaporation

optical microscope uses visible light and a lense to generate magnification

scanning electron microscope prodces image of a sample scanning with a focused beam of electron

transmission electron microscope in which beam of light of electrins is transmitted through a specimen to form an image