WAEC SSCE - Biology - 1994

The structure used by fishes to detect the presence and movement of other animals
by the vibration they produce is the

Answer Details

The structure used by fishes to detect the presence and movement of other animals by the vibration they produce is the lateral line. The lateral line is a sensory system present in most fish that runs along their sides from head to tail. It contains tiny sensory cells that can detect changes in water pressure and vibrations in the water. These vibrations could be produced by other fish, predators, prey or any other moving objects in the water. Fish use this sense to locate prey and navigate through their environment. The lateral line is crucial to the survival of many species of fish.

The foot labelled III is strong and has blunt claws
on its digits, This implies that the bird

Answer Details

The long and sharp claws in the font labelled ll show that the bird uses them to

Answer Details

The long and sharp claws in the front labeled ll on a bird indicate that it uses them to hold onto its prey. Birds of prey, such as eagles and hawks, have sharp talons for catching and holding onto their prey, usually small mammals or other birds. The talons are also used to help the bird climb and perch on branches or other surfaces. The shape and size of the talons vary depending on the species of bird and its feeding habits.

Which of the following is not a condition necessary for germination to occur in most seeds?

Answer Details

Soil fertility is not a condition necessary for germination to occur in most seeds. Germination is the process by which a seed develops into a new plant. For germination to occur, most seeds require water to activate enzymes, air for respiration, and a suitable temperature to trigger metabolic processes. Soil fertility, although important for the growth of the new plant, is not a direct requirement for germination. Soil provides the nutrients necessary for the plant to grow after germination, but the seed can still germinate and begin to develop into a new plant without being in soil. Therefore, the correct option is "Soil fertility".

In human beings the albino trait it recessive and the normal skin colour is dominant. Therefore the probability
of parent’s that are heterozygous for albinism, having an albino child

Answer Details

In humans, the albino trait is recessive, which means that an individual must inherit two copies of the albino gene (one from each parent) to have albinism. Normal skin color is dominant, meaning that an individual only needs one copy of the normal skin color gene to express that trait. If both parents are heterozygous for albinism, meaning they carry one albino gene and one normal skin color gene, then each parent has a 50% chance of passing on the albino gene and a 50% chance of passing on the normal skin color gene to their child. Therefore, the probability of both parents passing on the albino gene to their child is (1/2) x (1/2) = 1/4 or 25%. This means that the probability of the heterozygous parents having an albino child is 1/4 or 25%.