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Biology Past Questions
During blood transfusion, agglutination may occur as a result of the reaction between
- A. two different antigens
- B. two different antibodies
- C. similar antigens and antibodies
- D. contrasting antigens and antibodies
The uniqueness of an individual organism in a population is accounted for by
- A. evolution
- B. variation
- C. adaptation
- D. mutation
the interaction of a community of organisms with its abiotic environment constitutes
- A. a food chain
- B. an ecosystem
- C. a microhabitat
- D. a niche
The stunted group of a leguminous plant suffering from nitrogen deficiency may be corrected by inoculating the soil with
- A. denitrifying bacteria
- B. saprophytic bacteria
- C. Rhizobium
- D. nitrosomonas
The barrier between maternal and foetal blood is the
- A. placenta
- B. liver
- C. umbilical chord
- D. uterine wall
Which of the following is the lowest category of classification?
- A. Class
- B. species
- C. Family
- D. Genus
The loss of soil through erosion can be reduced by
- A. watering
- B. crop rotation
- C. maturing
- D. irrigation
In the mammalian male reproductive system, the part that serves as a passage for both urine and semen is the
- A. urethra
- B. ureter
- C. bladder
- D. seminal vesicle
The outer layer of the kidney where the Bowman’s capsules are found is the
- A. cortex
- B. pelvis
- C. medulla
- D. pyramid
The part of the alimentary system of a bird where food is ground into small particles is the
- A. cloaca
- B. stomach
- C. crop
- D. gizzard