JAMB Biology Past Questions & Answers - Page 37

181.

The following are example of morphological variation except

A.

size

B.

ability to taste PTC

C.

color

D.

fingerprint

Correct answer is B

Morphological variation includes aspects of the outward appearance i.e shape, structure, color, pattern, size which is in contrast to physiology variation which deals primarily with function.

Morphological variation arises from a number of factors which can be bluntly classified as either genetic or environmental implanted into the process of evolution.

182.

An example of organism which exists as a colony is

A.

Volvox

B.

paramecium

C.

euglena

D.

chlamydomonas

Correct answer is A

Volvox is an example of organism thatforms spherical colonies of up to 50,000 cells.
A colony is composed of two or more individuals living in close association with, or connected to, one another, usually for mutual benefit such as stronger defense or the ability to attack bigger prey.

It is a cluster of identical cells (clones) on the surface of (or within) a solid medium, usually derived from a single parent cell.

183.

The type of nutrition exhibited when organism lives on the body surface or inside the body of another type of organism is

A.

Holozoic

B.

parasitic

C.

saprohytic

D.

carnivores

Correct answer is B

Parasitic nutrition is heterotrophic nutrition where a parasitic organism lives on the body surface or inside the body of another type of organism (a host) and gets nutrition directly from the body of the host. Since these parasites derive nourishment from their host, this symbiotic interaction is often described as harmful to the host.
Saprotrophic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of decayed organic matter.

The organism feeds on dead matter i.e fungi
A carnivore is an organism that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of animal tissue, whether through predation or scavenging.

184.

When an ovary is placed on the receptacle above the other floral parts it is referred to as

A.

half inferior ovary

B.

superior ovary

C.

inferior ovary

D.

half superior ovary

Correct answer is B

A superior ovary is an ovary attached to the receptacle above the attachment of other floral parts
A half-inferior ovary is embedded or surrounded by the receptacle.

An inferior ovary lies below the attachment of other floral parts.

185.

Use the diagram to answer the question that follows.

The dentition is found in

A.

rat

B.

dog

C.

sheep

D.

man

Correct answer is D

No explanation has been provided for this answer.