11. Which of the following structures would carry out cellular respiration? A
- A. germinating seed
- B. decolorised leaf
- C. dry leaf
- D. boiled cowpea
Correct Option: Answer is A
Germinating seeds respire by using oxygen and producing carbon dioxide gas, they respire in the similar way as animals
12. Which of the following is NOT an excretory product of animals?
- A. carbondioxide
- B. urea
- C. sweat
- D. oxygen
Correct Option: Answer is D
Animals take in oxygen in respiratory process, taking out carbon dioxide.
13. An example of homeostasis in living organisms is
- A. cooling effect resulting from evaporation of water from the body surface
- B. root hairs of a plant growing towards the source of light
- C. changing of the body colour of chameleon to match the colour of the foliage on which it is resting
- D. the release of phosphorus into the phloem of a plant growing in a phosphorus-deficient soil
Correct Option: Answer is C
Homeostasis, any self-regulating process by which biological systems tend to maintain stability while adjusting to conditions that are optimal for survival.
14. Ultrafiltration in the kidney takes place in the
- A. Renal vein
- B. Medulla
- C. Loop of Henle
- D. Bowman’s Capsule
Correct Option: Answer is D
Bowman’s capsule (or the Bowman capsule, capsula glomeruli, or glomerular capsule) is a cup-like sack at the beginning of the tubular component of a nephron in the mammalian kidney that performs the first step in the filtration of blood to form urine. A glomerulus is enclosed in the sac.
15. The thyroid gland is found at the base of the
- A. Midbrain
- B. Kidney
- C. Neck
- D. Liver
Correct Option: Answer is C
The thyroid is a butterfly-shaped gland that sits low on the front of the neck.
16. Which of the following statements about the response of neurones to stimulus is correct?
- A. Neurons respond to stimulus of any strength
- B. Neurons respond to all stimuli applied in rapid succession
- C. Neurons respond more rapidly during the absolute refraction period
- D. Intensity of stimulus must reach a threshold value before the neurons can be excited
Correct Option: Answer is D
Each neuron has a threshold that must be met before an action potential travels the length of the neurons axon. In other words, the neurons don’t just begin to act immediately, there is a threshold value where the intensity of the stimulus must get to in order to yield a response from the neuron. This is why you can consciously pinch your self and not feel anything serious but when it is unconscious, it gives you serious pain
17. Which of the following practices may lead to infection of the eye? Use of
- A. contact lenses
- B. convex lenses
- C. biconcave lenses
- D. concave lenses
Correct Option: Answer is A
Contact lenses have a way of causing infections to the eyes at some point. It can cause a lack of oxygen since they are worn directly in the eye, especially if worn for long periods at a stretch.
18. The structures for gaseous exchange in breathing roots are
- A. stomata
- B. lenticels
- C. cuticle
- D. mitochondria
Correct Option: Answer is B
Breathing roots, also known as pneumatophores, have portions of the root which grow upward until they project some centimetres above the low-tide level. They have small openings called lenticels in their bark so that air can reach the rest of the plant’s root system.
19.
The diagram above is an illustration of the life cycle of an insect. The adult fly in this cycle is called
- A. Housefly
- B. Butterfly
- C. Cockroach
- D. Mosquito
Correct Option: Answer is B
From the diagram, the larva is a caterpillar, hence, the adult is called a Butterfly.
20.
In the diagram above, the larva is also known as
- A. Nymph
- B. Caterpillar
- C. Maggot
- D. Chrysalis
Correct Option: Answer is C
The diagram is the life cycle of a butterfly whose larva is called Caterpillar