Biology Past Questions And Answers
Which of the following is the effect of using artificial pollination in plant breeding?
- A) production of healthy crops
- B) improvement of the variety of crops
- C) lengthening the maturity time
- D) making crops susceptible to diseases
The cell component that is present in a prokaryotic cell is the
- A. Chloroplast
- B. Ribosome
- C. Mitochondrion
- D. Nuclear envelope
An enzyme reaction may begin to decline when?
- A. the optimum temperature is attained
- B. the ph of the medium is altered
- C. there is an increase in substrate concentration
- D. the atmospheric pressure is altered
The diagram below shows the dentition of an organism. What organism is this?
- A. rabbit
- B. cat
- C. frog
- D. man
A characteristic of vertebrates that is unique to mammals is
- A. the presence of pentadctyl limbs
- B. parental care
- C. the possession of scrotum
- D. pulmonary circulation
The essential structural difference between hydra and tapeworm is that while Hydra
- A. has tentacles, tapeworm is parasitic
- B. is diploblastic, tapeworm is triplobastic
- C. has a mouth, tapeworm feeds by suckers
- D. has mesoderm, tapeworm has mesogloea
The illustration above represents a cross between a colour blind male and normal female. Study it carefully and answer the questions.
Which of the genotypes are carriers of colour blindness?
- A. 1 and 11 only
- B. 1 and 111 only
- C. 11 and 111 only
- D. 1, 11 and 111 only
Long neck in giraffe is used to illustrate the theory of
- A. use and disuse
- B. origin of species
- C. origin of life
- D. natural selection
________ is involved in the mechanism of expelling water from the protozoans during the process of _______
- A) Contractile vacuole, Osmoregulation
- B) Contractile vacuole, Phagocytosis
- C) Food vacuole, Ultrafilteration
- D) Food vacuole, Pinocytosis
Which of the following is not a dry indehiscent fruit?
- A. Legume
- B. Cypsela
- C. Samara
- D. Caryopsis