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

Which of the following structures in a flower develops into the seed?

A. Testa

B. lntegument

C. Ovule

D. Ovary

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

The brightly coloured petals in some plants is an adaptive colouration for

A. feeding

B. pollination

C. dispersal

D. shedding

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 major role played by accessory pigments during photosynthesis is the phloem. 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

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

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

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

The purpose of proteins in the diet of a mammal is to

A. promote growth and repair cells

B. break down molecules

C. regulate the flow of chyme

D. serve as co-factors or enzymes