JAMB Biology Past Questions & Answers - Page 20

96.

The growth of mucor on a piece of bread is?

A.

scavenging

B.

commensalism

C.

autotrophism

D.

saprophytism

Correct answer is D

Bread mold is saprophytic, as are most types of fungi.

An organism that is saprophytic is one that feeds off of dead or decaying.

97.

An ecological instrument used to measure wind direction is? 

A.

Secchi disc

B.

wind vane

C.

anemometer

D.

slope gauge

Correct answer is B

Wind direction is usually measured using a wind vane. 

98.

In genetic counseling, a man with hemoglobin  formation HbA HbS is most preferred to marry a woman of?

A.

HbA HbA

B.

HbC HbH

C.

HbM HbF

D.

HbS HbS

Correct answer is A

AS and AS should not marry, there is every chance of having a child with SS. AS and SS

AA marries an AS. You'll end up with kids with AA and AS which is good.

99.

The genes crossing over occurs during?

A.

fertilization

B.

mutation

C.

mitosis

D.

meiosis

Correct answer is D

Specifically, meiosis creates new combinations of genetic material in each of the four daughter cells.

These new combinations result from the exchange of DNA between paired chromosomes. Such exchange means that the gametes produced through meiosis exhibit an amazing range of genetic variation.

100.

Tall trees with buttress roots and evergreen leaves are characteristics features of?

A.

temperate grassland

B.

Southern Guinea Savanna

C.

tropical rain forests

D.

Northern Guinea savanna

Correct answer is C

Rainforest trees are quite different from trees of temperate forests. In the rainforest, trees grow to gigantic size, supported by strong, strut-like buttresses at the base of the trunk that help to stabilize them in shallow forest soils. Huge creepers twine themselves around the trunks of trees.