Jamb 1997 Biology Past Questions And Answers
After a heavy rainfall and the formation of a large pond, the most likely sequence of changes in the vegetation of the pond is
- A. Euglena → water lily → Spirogyra → grass
- B. water lily → Spirogyra →grass → Euglena
- C. Spirogyra → Euglena → grass → water lily
- D. Euglena → Spirogyra → water lily → grass
Water loss is regulated in plants and animals by both the
- A. scales and the skin
- B. scales and the hair
- C. thick leaves and the feathers
- D. leathery cuticle and the feathers
In a soil sample, the relative amouunts of the different soil particles can best be determined by the process of
- A. filtration
- B. centrifugation
- C. precipitation
- D. sedimentation
The homozygous condition HbsHbsresults in sickle cell anaemia whereas HbAHbs has the sickling trait. What is the probability that a couple with the sickling trait will give birth to one normal child?
- A. 1/2
- B. 1/4
- C. 1/8
- D. none
The group of insects that undergoes complete metamorphosis is
- A. houseflies, beetles and cockroaches
- B. cockroaches, grasshoppers and bees
- C. houseflies, beetles and butterflies
- D. aphids, grasshopper and butterflies
Which is the most important pollutant of the marine environment in Nigeria?
- A. Insecticides
- B. Sewage
- C. Oil
- D. Inorganic fertilizers
Viruses differ from all forms of life because they
- A. have thick cell wall
- B. feed on waste products of other organisms
- C. causes infectious diseases
- D. require other living cells to multiply
During binary fission in lower organisms, the nucleus is known to undergo
- A. mitosis
- B. meiosis
- C. fragmentation
- D. mutation
The ability of the eye to focus on both near and distant objects is termed
- A. image formation
- B. refraction
- C. hypermetropia
- D. Accomodation
Which of the following fruits is a schizocarp?
- A. Groundnut
- B. Desmodium
- C. crotalaria
- D. Cashew