Question 71:

• JAMB 1978

A potometer with a leafy shoot weighed 18.9g initially and weighed 17.9g after one hour. From this it follow that

A. The shoot absorbed 1g of water per hour
B. 1g of water per hour evaporates from the potometer
C. The shoot lost 1g of water per hour
D. The potometer water receded at the rate of 1g per hour
E. The shoot was respiring and lost weight at rate of 1g per hour

Question 72:

• JAMB 1978

At fertilization

A. One chromosome from the male joins another from the female
B. One gene from the male combines with another from the female
C. The male nucleus fuses with the female nucleus
D. One set of chromosome combines with another set from the female
E. One cell from the male fuses with another from the female

Question 73:

• JAMB 1978

The neck region of the tape worm, (taenia) is responsible for the

A. Production of egg
B. Storage of egg
C. Formation of new segment
D. Development of the suckers
E. Fragmentaion of the body segment

Question 74:

• JAMB 1978

Which of these is not true of the insect? The possession of

A. Two pairs of antennae
B. Jointed appendages
C. Exoskeleton
D. Three pairs of legs
E. Segmented body

Question 75:

• JAMB 1978

Rhizopus (or mucor)obtain its food from dead organic matter extracellularly. It is said to be

A. A facultative parasite
B. Saprophyte
C. An obligate parasite
D. A commensal
E. An autotroph