JAMB Biology 1992 past questions

The essential structural difference between Hydra and tapeworm is that while Hydra,

The flowering period of plants in a habitat is determined by the

The structure labeled X is used by the organism in the same way as man uses his

The structure labelled Y is the

Which of the following insects undergoes incomplete metamorphosis?

An onion is a bulb because it

The flow of air and water in or out of the mesophyll layer of a leaf is controlled by the

Fungi are heterotrophic because they

The major site of photosynthesis in the leaf is the

5cm3 dilute sodium hydroxide solution and 5cm3 one percent copper sulphate solution are added to a solution of food specimen. The purple colour which is observed shows the presence of

The blood vessel which carries blood from the alimentary canal to the liver is the

Gaseous exchange in Aves occurs in the

In the absence of oxygen, the pyruvic acid produced during glycolysis is converted to Co2 and

The excretory organ in insect is the

The structure labelled 5 is the

The bone of the neck on which the skull rests is known as the

Which enzymes are contained in the pancreatic juice?

The part labeled 3 is the

The function of the part labeled 1 is to

Double fertilization in higher plant is significant because it ensures the

In mammalian development, the function of the yolk is to

Hydrogeal germination scharacterized by the

Fruits which develop without fertilization of the ovule are

Which part of the curve represents the fastest rate of growth?

The grand period of growth is represented by

Neurons that receive stimuli from the body or internal organs are called

Which of the following is true of a climax community?

In typical predator food chain involving secondary and tertiary consumers, the organisms become progressively

Which level of the pyramid has the least total stored energy?

Which organism in the pyramid functions as a tertiary consumer?

Mangrove swamp can be found

Soil with the finest particles is called

Malaria symptoms are caused by

Which of the following is true of the children of a haemophilic man who marries a woman that is not haemophilic and does not carry the trait?

If R and r denote the genes for a character, the offspring of the cross between RR and Rr are

Pawpaw seeds collected from a tree with many desirable agronomic qualities did not give rise to plants of desirable characters as the parent because

Women do not suffer from colour blindness

The hereditary material of the cell is

An example of plant adaptation to a xerophytic environment is represented by the development of

Which of the following factors is LEAST likely to affect the animals living in a fresh water habitat?

The theory of natural selection was developed by