The correct evolutionary sequence of the organisms represented is
- A. IV->II->III->I
- B. III->II->I->IV
- C. II->III->IV->I
- D. I->III=>II->IV
Ovoviparity is the type of fertilization exhibited by the organism labelled
- A. IV
- B. III
- C. II
- D. I
A hormone secreted at IV serves to
- A. make the body react to emergencies
- B. lower blood glucose level
- C. raise the level of calcium ions in the blood
- D. facilitate the development of facial hairs
What proportion of the offspring of a cross between two heterozygous parents will exhibit the recessive condition phenotypically
- A. 1/4
- B. 1/2
- C. 3/4
- D. 4/4
Genetic counselling is important when a marriage is planned between a
- A. Rh- woman and Rh man+
- B. Rh- woman and Rh- man
- C. Rh+ woman and Rh+ man
- D. Rh+ woman and Rh- man
The first four children of a couple were all girls. The probability that the fifth will also be a girl is
- A. 1/5
- B. 1/4
- C. 1/3
- D. 1/2
If XN is the dominant allele for normal vision and Xn the recessive allele for colour blindness, a boy with the genotype YXn will be
- A. have normal vision
- B. be colour-blind
- C. be totally blind
- D. be a carrier of colour blindness
In a population of living things, the parameters of size, height, weight and colour are examples of
- A. discontinuous variation
- B. continuous variation
- C. physiological variation
- D. non-heritable variation
To select and retain the desirable trait of large body size which a farmer has observed in his herd, the farmer needs to
- A. feed the animals in the herd with more food
- B. cross-breed his animals with a different herd
- C. inbreed the animals in his herd
- D. prevent disease in herd
The gland usually found in the position labelled I is the
- A. adrenal
- B. thyriod
- C. pancreatic
- D. pituitary
The structure labelled I represented the
- A. phloem
- B. xylem
- C. cortex
- D. pericycle
The function of the absorption is performed by the structure labelled
- A. I
- B. II
- C. III
- D. IV
Tissue respiration is important for the
- A. absorption of oxygen into the alveoli
- B. release of carbon (IV) oxide into the lungs
- C. release of energy for the body use
- D. exhalation of carbon(IV) oxide from the lungs
A person that is obese must avoid meals containing
- A. `carrots and oranges
- B. margarine and butter
- C. beaf and beans
- D. rice and yam
In which of the following groups of fruits is the pericarp inseparable from the seed coat?
- A. Nut
- B. Follicle
- C. Cypsela
- D. Crayopsis
The organ located within the duodenal loop in the mamal is the
- A. spleen
- B. pancreas
- C. liver
- D. gall bladder
The mode of nutrition exhibited by a tapeworm is
- A. symbiotic
- B. saprophytic
- C. parasitic
- D. holozoic
Which of the following pairs of organ is located in the anterior half of the mammalian body cavity?
- A. Kidneys and lungs
- B. Heart and ovary
- C. Lungs and heart
- D. Kidneys and heart
When a marine fish was taken from the ocean and put in a tank of fresh water, it died after a short period because
- A. the tank was too small compare to the large ocean
- B. the body cells of the fish swelled and burst as a result of the hypotonic fresh water
- C. the body cells of the fish shrank as their sap was hypertonic to the fresh water
- D. there was no food in the tank, so the starved.
The experimental set-up can be used to demonstrate that
- A. light is necessary for photosynthesis
- B. oxygen is necessary for photosynthesis
- C. photosynthesis occurs in the leaves of plants
- D. carbon (IV) oxide is necessary for photosynthesis
Which of the following statement is correct about the experiment?
- A. The flask must be of the conical type
- B. Caustic soda can be replaced with distilled water
- C. The enclosed leaf will lose its green colour
- D. The leaves outside the flask serve as control