Waec Biology Past Questions For Year 2005
Question 11
Which of the following statements defines plasmolysis?
- A. Shrinking of a plant cell in a solution
- B. Shrinking away of cytoplasm from an animal cell membrane
- C. Shrinking away of the cytoplasm from the plant cell wall
- D. shrinking of the vacuole and leaving the cytoplasm attached to the cell wall
Question 12
Which of the following substance pass through the root cell membrane by osmosis?
- A. Cell sap
- B. Carbon dioxide
- C. oxygen
- D. water
Question 13
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
Question 14
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
Question 15
Which of the following pairs of organisms exist as colonies?
- A. Obelia and Euglena
- B. Pandorina and Volvox
- C. Chlamydomonas and Amoeba
- D. Hydra and Spirogyra
