Jamb 2016 Biology Past Questions And Answers
1
The activity of ptyalin is likely to decrease with an increase in the concentration of
- A. oxygen
- B. starch
- C. protein
- D. acid
2
The crossing of individuals of the same species with different genetic characters is
- A. croos breeding
- B. polygenic inheritance
- C. non-disjunction
- D. inbreeding
3
Seed plants are divided into
- A. monocoty ledons and dicotyledons
- B. tracheophytes and ferns
- C. angiosperms and gymnosperms
- D. thallophytes and bryophytes
4
Exo-erythrocytic phase of the life cycle of malaria parasite occurs in the
- A. liver of humans
- B. reticuloendothelial cells of humans
- C. Malphigian tubules of mosquito
- D. brain of humans
5
An example of an endospermous seed is
- A. been seed
- B. cashew nut
- C. cotton seed
- D. maize grain
6
The adaptive importance of the nuptial flight from termite colonies is to
- A. ensure cross-breeding between members of one colony and another
- B. disperse the reproductives in order to establish new colonies
- C. provide abundant food for birds and other animals during the early rains
- D. expel the reproductives so as to provide enough food for other members
7
The insects in which the maxillae are modified into a long coiled proboscis is
- A. housefly
- B. butterfly
- C. mosquito
- D. grasshopper
8
In the nitrogen cycle, the nitrates in the soil are converted to atmospheric nitrogen by
- A. puterfying bacteria
- B. nitrogen-fixing bacteria
- C. nitrifying bacteria
- D. denitrifying bacteria
9
The theory of natural selection was postulated by
- A. Gregor Mendel
- B. Matthias Schleiden
- C. Charles Darwin
- D. Robert Hook
10
The hereditary characters in plants and animals are located on the
- A. gene
- B. mucleus
- C. chromosome
- D. cell