Biology Past Questions And Answers
3261
The path followed by air as it passes through the lungs in mammals is
- A. trachea → bronchi → bronchioles → alveoli
- B. bronchi → trachea → alveoli → bronchioles
- C. trachea → bronchioles → alveoli
- D. bronchioles → alveoli → bronchi →trachea
3262
One important characteristics of green plant is that they
- A. possess specialized sense organs
- B. Are usually motile
- C. Are autotropic
- D. Respond slowly to stimuli
3263
In the nitrogen cycle, the nitrates in the soil are converted to atmospheric nitrogen by
- A. puterfying bacteria
- B. nitrogen-fixing bacteria
- C. nitrifying bacteria
- D. denitrifying bacteria
3264
The gland that is found just below the hypothalamus is the
- A. parathyroid
- B. adrenal
- C. pituitary
- D. thyroid
3265
Fruit enlargement can be induced by spraying young ovary with
- A) gibberellins, ethylene and abssisic acid
- B) auxin, abscisic acid and ethylene
- C) auxin, cytokinin and gibberellins
- D) auxin, kinin and gibberelin
3266
At which trophic level would the highest accumulation of a non-biodegradable substance occur?
- A. Primary producers
- B. Tertiary consumers
- C. Primary consumers
- D. Secondary consumers
3267
Open circulatory is found in
- A) rat
- B) bird
- C) toad
- D) insect
3268
Colonization of a bare rock surface is termed
- A. evolution
- B. specification
- C. primary succession
- D. secondary succession
3269
The part of the central nervous system that controls unconscious actions in humans is the
- A. cerebellum
- B. cerebrum
- C. spinal cord
- D. optic nerves
3270
Flaccidity in plants is associated with
- A. cessation of photosynthesis
- B. wilting
- C. turgidity
- D. discolouration of leaves