JAMB Biology Past Questions & Answers - Page 15

71.

Which of the following represents an example of ecological management and conservation through a biological association?

A.

Constructing dams for hydroelectric power

B.

Introducing invasive species for pest control

C.

Clear-cutting forests for timber extraction

D.

Establishing marine protected areas

Correct answer is D

Ecological management and conservation involve strategies and practices aimed at preserving and protecting natural ecosystems and their biodiversity. Among the options provided, the establishment of marine protected areas is an example of such management and conservation through a biological association.

72.

Which of the following are components of the skeletal system in humans?

A.

Cartilage and blood vessels

B.

Ligaments and tendons

C.

Muscles and nerves

D.

Bones and joints

Correct answer is D

The skeletal system in humans is composed of bones and joints. Bones and joints are the primary components of the human skeletal system.

73.

Which of the following is an example of physiological variation in organisms?

A.

Variation in blood pressure among individuals

B.

Variation in beak shape among finches

C.

Differences in fur color in rabbits

D.

Variation in leaf shape in plants

Correct answer is A

Physiological variation refers to differences in physiological traits or functions among individuals within a species. Blood pressure is a physiological parameter that can vary among individuals based on factors such as genetics, health conditions, lifestyle, and environmental influences. Physiological variation encompasses variations in functions, processes, and internal characteristics of organisms, such as metabolic rates, hormone levels, enzyme activities, blood parameters, and other physiological traits.

74.

A biome characterized by hot summer, warm winter and treeless vegetation is

A.

Steppe grasslands

B.

Temperate deserts

C.

Savannah grassland

D.

Tropical deserts

Correct answer is A

A biome characterized by hot summer, warm winter and treeless vegetation is the Steppe grassland. Steppe grasslands are characterized by grassy plains without trees apart from those near rivers and lakes. The summers can be hot, sometimes 40°C (104 °F) or more, but winters are cold, with temperatures often falling below freezing.

75.

Which of the following is a characteristic feature of Kingdom Plantae?

A.

Presence of chloroplasts

B.

Ability to perform photosynthesis

C.

Lack of cell walls

D.

Heterotrophic mode of nutrition

Correct answer is A

Kingdom Plantae is characterized by the presence of chloroplasts. Chloroplasts are the site of photosynthesis in plant cells, where light energy is converted into chemical energy. This is not to say that all organisms with chloroplasts belong to the Plantae kingdom, but it is a common feature of this kingdom.