JAMB Biology Past Questions & Answers - Page 19

91.

Pentadactyl plan of the fore limbs of frog, bird, horse, whale and man is a proof of?

A.

spontaneous generation

B.

evolution

C.

locomotion

D.

creation

Correct answer is B

The limbs of crocodiles, birds, whales, horses, bats and humans all look very different they share the same five fingered bone structure.

This provides evidence for the theory of evolution .

92.

The sum total of all observable features of an organism is?

A.

phenotype

B.

heterozygous

C.

genotype

D.

homozygous

Correct answer is A

Phenotype refers to an individual's observable traits, such as height, eye color and blood type.

A person's phenotype is determined by both their genomic makeup (genotype) and environmental factors.

93.

The end product of the digestion of carbohydrate is?

A.

amino acid

B.

glycerol

C.

glucose

D.

sucrose

Correct answer is C

The final product of carbohydrate digestion is primarily glucose along with some fructose, glucose, and galactose, while amino acids are the end products of protein digestion.

94.

The display of male agama lizard is to?

A.

scare predators

B.

regulate body temperature

C.

attract female for mate

D.

give invite to intruders

Correct answer is C

Tail wagging, bright colors, mouth gaping/display, inflation, body posture, head bobs, and 'push-ups' (some animals are capable of changing color to attract mates) are some displays that allow lizards to send signals to translate to a potential mate

95.

Conversion of atmosphere carbon into chemical bond energy occurs during the process of?

A.

transpiration

B.

photosynthesis

C.

digestion

D.

respiration

Correct answer is B

As photosynthetic organisms, plants take up atmospheric CO2, chemically reducing the carbon.

This represents not only an acquisition of stored chemical energy for the plant, but also provides the carbon skeletons for the organic molecules that make up a plants' structure.