Which of the following groups of environmental factors are density-dependent?

A. Food, salinity, accumulation of matabolites and light

B. Temperature, salinity predation and disease

C. Food predation, disease and accumulation of metabolites

D. Temperature food disease and light

Millet , sorghum, maize and onions are common crops growth in Nigeria in the

A. tropical rainforests

B. sudan savanna

C. montane forests

D. sahel savanna

In which of the following biomes is the south western part of Nigeria located?

A. Temperate forest

B. Tropical rainforest

C. Tropical woodland

D. Desert

The inheritable characters that are determined by a gene located on the X-chromosome is

A. recessive

B. sex-linked

C. homozygous

D. dominant

Lack of space in a population could lead to an increase in

A. water scarcity

B. birth rate

C. disease rate

D. dought

If the cross of a red-flowered plant with a white-flowered plant produces a pink-flowered plant, it is an example of

A. codominance

B. incomplete dominance

C. mutation

D. linkage

Which of the following theories was NOT considered by Darwin in his evolutionary theory?

A. Variation

B. Survival of the fittest

C. Use and disuse

D. Competition

The crossing of individuals of the same species with different genetic characters is

A. cross breeding

B. polygenic inheritance

C. non-disjunction

D. inbreeding

The number of alleles controlling blood groups in humans

A. 3

B. 4

C. 5

D. 2

During blood transfusion, agglutination may occur as a result of the reaction between

A. contrasting antigens and antibodies

B. two different antigens

C. two different antibodies

D. similar antigens and antibodies