Which of the following statements defines plasmolysis?
Shrinking of a plant cell in a solution
Shrinking away of cytoplasm from an animal cell membrane
Shrinking away of the cytoplasm from the plant cell wall
shrinking of the vacuole and leaving the cytoplasm attached to the cell wall
Correct answer is C
No explanation has been provided for this answer.
Which of the following substance pass through the root cell membrane by osmosis?
Cell sap
Carbon dioxide
oxygen
water
Correct answer is D
No explanation has been provided for this answer.
In active transport, molecules move against a concentration gradient, therefore
molecules move from a region of low concentration to a region of high concentration
molecules move from a region of high concentration to a region of low concentration
the concentration gradient has little effect on the movement of molecules
molecules force their way through special channels
Correct answer is A
No explanation has been provided for this answer.
Which of the following Best explains why It is difficult to see clearly in dim light?
Initially the eyes cannot operate when the light is dim
The choroid reflect all the light that enters the eye
Too little light reaches the retina and so the cones may not be stimulated at all
Dim light causes the pupil to close up so that not much light enters the eye
Correct answer is C
No explanation has been provided for this answer.
Which of the following pairs of organisms exist as colonies?
Obelia and Euglena
Pandorina and Volvox
Chlamydomonas and Amoeba
Hydra and Spirogyra
Correct answer is B
No explanation has been provided for this answer.