2018 - WAEC Biology Past Questions and Answers - page 4

The secchi disc is used to check for the transparency and the turbidity of water.

From the food chain, the energy flows from the producers to the primary consumer to the secondary consumers and about 90% of the energy is lost in the process of this transfer. Hence, the energy level by the time it gets to the secondary consumers, there is less energy transferred to the decomposers.

The xerophytes have reduced leaf size in order to reduce the surface area, thereby reducing the water loss in the plant.

A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host.

Competition in a territory is as a result of a hassle for the available resources within the territory. For instance, when the water in a river seems to be drying out,  the organisms in the water begin to compete for the water.

Syphilis is caused by a bacterium known as Trepenoma pallidum. It is majorly passed on by sex.

Wildlife conservation is necessary for the prevention of the extinction of wildlife. It helps with the preservation of these wild animals.

The blood types A and AB can receive blood from blood types A and O but not B. Hence, if there was a problem after transfusion, it was most likely to be from BO.

The basic technique in identification of the antigens and antibodies of blood groups is the agglutination test and can be done to prevent the clumping of the red blood cell. The symptom is due to clumping due to incompatible blood transfusion.

Gregor Mendel is considered as the founder of modern science of genetics.