Which of the following substances must be present in the soil for growth of a healthy green plant?
- A. Amino acids
- B. Carbon
- C. Glucose salts
- D. Magnesium ions
What is the benefit of thunder and lightning to farmers?
- A. Addition of nitrates to the soil
- B. Aeration of the soil
- C. Removal of harmful bacteria from the soil
- D. Addition of rain water to the soil
The main raw materials required for photosynthesis are
- A. oxygen and water
- B. oxygen and carbon dioxide.
- C. oxygen and chlorophyll
- D. carbon dioxide and water
The major role played by accessory pigments during photosynthesis is to?
- A. add colour to plants but not to trap light energy
- B. trap light energy that chlorophyll cannot absorb
- C. transfer energy from chlorophyll to other pigments
- D. prevent chlorophyll from absorbing unnecessary light
Squirrels easily kill some trees because
- A. they inject poisonous substances into the trees.
- B. most trees are susceptible to squirrel bites
- C. they feed voraciously on the roots
- D. they gnaw the bark and destroy
The brightly coloured petals in some plants is an adaptive colouration for
- A. feeding
- B. pollination
- C. dispersal
- D. shedding
An illustration of a human male reproductive system is shown above. Which
of the labelled parts can be cut to-ensure permanent sterility?
- A. I
- B. II
- C. III
- D. IV
Which of the following structures in a flower develops into the seed?
- A. Testa
- B. lntegument
- C. Ovule
- D. Ovary
When fertilization occurs that leads to formation of a zygote, which of the following processes takes place?
- A. The tail of the sperm fuses with the egg cell
- B. Both tail and head of the sperm fuse with the egg cell
- C. The nucleus of the sperm fuses with the egg cell
- D. The egg cell develops on its own without the sperm
The hair on the human skin will stand erect when the person is
- A. in an air-conditioned room
- B. strolling in the sun
- C. taking a hot drink
- D. doing strenuous exercise
Which of the following parts of the eye contains light sensitive cells?
- A. Choroid
- B. iris
- C. Retina
- D. Lens
The function of the convex lens in the correction of eye defects is to
- A. diverge light rays from far objects to focus image on the retina
- B. converge light rays to focus image behind the retina
- C. converge light rays to focus time image before the retina
- D. converge light rays from far objects to focus their image on the retina
A student dissecting am animal specimen discovered that it had two auricle and on ventricle. The animal is likely to a/an
- A. fish
- B. reptile
- C. amphibian
- D. bird
Impulses are conducted towards the nerve cell through the
- A. myelin sheath
- B. dendrons
- C. axons
- D. synaptic nodes
The following are all examples of a simple reflex action, except
- A. swallowing
- B. sneezing
- C. walking
- D. blinking
Increasing adrenalin content of the blood would be expected to decrease the flow of blood to the
- A. liver
- B. heart
- C. lungs
- D. brain
The diagram above is an illustration of the human excretory system. Which of the labelled parts contains the
highest amount of nitrogenous waste?
- A. I
- B. II
- C. IV
- D. VI
The diagrams above are part of the human lungs. Which of the parts is diagram Z taken from
- A. II
- B. III
- C. IV
- D. V
Which of the individual is likely to have HIV?
- A. I
- B. II
- C. III
- D. IV
Which of the individual is likely to be suffering from haemophilia?
- A. I
- B. II
- C. III
- D. IV
The pulmonary circulation involves movement of the blood to and from the
- A. brain
- B. Kidney
- C. Liver
- D. lungs