Biology Past Questions

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2421

Which of these organs can be considered vestigial in humans but functional in other mammals? The

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2422

Which of the following pairs of organisms are photosynthetic?

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2423

Which of the following pairs of organisms exist as colonies?

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2424

Which of the following Best explains why It is difficult to see clearly in dim light?

A. Initially the eyes cannot operate when the light is dim
B. The choroid reflect all the light that enters the eye
C. Too little light reaches the retina and so the cones may not be stimulated at all
D. Dim light causes the pupil to close up so that not much light enters the eye

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2425

In active transport, molecules move against a concentration gradient, therefore

A. molecules move from a region of low concentration to a region of high concentration
B. molecules move from a region of high concentration to a region of low concentration
C. the concentration gradient has little effect on the movement of molecules
D. molecules force their way through special channels

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