Biology Questions: Basic Cell Structure

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Activity 3: Elodea leaf.   

h. How many cell layers thick is the leaf? *Focus up and down to determine this. You’re approximating here so this is just an estimate.
Answer: Two cell layer thick

i. Describe the color and shape of the chloroplast.
Answer: Chloroplasts are green in colour. They are green because of the presence of chlorophyll, the light-absorbing pigment necessary for photosynthesis. Chloroplasts are oval in shape.

j. What is the function of the chloroplasts?
Answer: Chloroplasts contain the pigment chlorophyll. The pigment traps the light energy from sunlight and transforms them into chemical energy. The chloroplast is the site of photosynthesis.

k. Why is it beneficial for the chloroplasts to move rather than remain stationary in the cell?
Answer: The chloroplast motion is known as chloroplast avoidance motion, which is in response to high intense light. In case of high intensity light, the entire chloroplast lineup like a blade to let the light passes through. Whereas in case of dim light these chloroplast flip their alignment, to catch the light. This appears to be a method of adjusting the amount of damage to the plant by sunlight.
In the cell there are another movement known as cyclonic or cytoplasmic streaming. The real cause of this streaming is unclear, but the movement changes with heat and light....

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