The basic point of impact by changes which produce mutation is the
- A. gametes
- B. chromosomes
- C. phenotype
- D. zygote
The best explanation for the theories of natural selection is that
- A. all organisms have equal capacity for survival in their habitats
- B. organisms have varying capacities for survival in their habitats
- C. organisms compete for resource and better competitors survive and thrive
- D. habitats allow only organisms that will not have to compete for survival
In the whistling pine, leaves are reduced to brown scales and young stems are green. This is an adaptation for
- A. obtaining food
- B. conserving nutrients
- C. storing water
- D. reducing transpiration
In the honey bee colony, the drones are
- A. sterile males with reduced mouth parts
- B. sterile males with well-developed mouth parts
- C. fertile males with reduced mouth parts
- D. fertile males with well-developed mouth parts
Toes of the feet ending in sharp, curved hook suitable for holding and tearing are most likely to belong to the bird with the bill in
- A. I
- B. II
- C. III
- D. IV
The bird’s bill adapted for fishing is labelled
- A. I
- B. II
- C. III
- D. IV
The group of insects that have mouth parts adapted for both piercing and sucking is
- A. cockroach, aphids and mosquitoes
- B. aphids, houseflies and moths
- C. mosquitoes, tse-tse flies and aphids
- D. aphids, beetles and grasshoppers
The biological association that contributes directly to succession in a community is
- A. competition
- B. predation
- C. parasitism
- D. commensalism
A sex-linked character cannot be passed on directly from
- A. father to son
- B. mother to daughter
- C. mother to son
- D. father to daughter
The correct increasing order of size for the cell components responsible for heredity is
- A. chromosome → DNA → nucleus → gene
- B. DNA → gene → chromosome → nucleus
- C. chromosome → nucleus → DNA → gene
- D. DNA → gene → nucleus → chromosome
The phenotype of an individual can be summed up as the
- A. totality of the expressed traits
- B. individual's physical appearance
- C. individual's entire genetical make-up
- D. physiological traits of individual
After one week of life, the weight of five chicks of the same sex hatched simultaneously from the eggs of the same hen and fed on the same diet were 45g, 40g, 35g, 33g and 30g. This is an example of
- A. growth rate
- B. natural selection
- C. variation
- D. mutation
The line that represents efficient recycling combined with stringent conservation is
- A. IV
- B. III
- C. II
- D. I
In blood transfusion, agglutination occurs when
- A. white blood cells from two individuals meet
- B. two different antibodies meet
- C. two different antigens meet
- D. contrasting antigens and antibodies meet
One of the ways which body cells differ from gamete cells is in the
- A. type of centromeres they contain
- B. number of chromosomes pairs they contain
- C. type of chromatide they contain
- D. number of chromosomes they contain
Which of the following groups of diseases are associated with water? I Onchocerciasis II Schistosomiasis III Dracunculiasis IV Elephantiasis V Taeniasis
- A. I, II and III
- B. II, IV and V
- C. II, III and IV
- D. I, II and V
Soil micro-organisms are beneficial because of their involvement in
- A. photosynthesis
- B. translocation
- C. cycling of nutrients
- D. respiration using soil air
The sequence of the biomes in Nigeria from port Harcourt to Damaturu is
- A. estuarine → rain forest → Guinea Savannah → Sahel Savannah
- B. rain forest → Guinea savannah → estuarine → desert
- C. estuarine → Guinea savannah → rain forest → Sahel savannah
- D. rain forest → estuarine → Guinea savannah → desert
A fresh water plant such as water lily can solve the problem of buoyancy by the possession of
- A. aerenchymarous tissues
- B. dissected leaves
- C. thin cell walls of the epidermis
- D. water-repelling epidermis
The condition that encourages denitrification is
- A. low soil oxygen
- B. high soil nitrogen
- C. absence of soil bacteria
- D. lightening and thunderstrom