When species of plant or animal disappears completely from a place where it previously existed, it is said to be:

• A) Endangered
• B) Threatened
• C) Extinct
• D) Rare

Assuming that brown colour is dominant over black colour in cowpea, what percentage of the F1 will have brown colour , if a homozygous brown cowpea is crossed with a homozygous black cowpea?

• A. 100%
• B. 75%
• C. 50%
• D. 25%

List six environmental factors affecting agricultural production in Nigeria. (b) Explain briefly how five of the factors listed in (a) can affect agricultural production in Nigeria

The development of agriculture in West Africa is not generally affected by

• A. ignorance
• B. religious beliefs
• C. poor marketing
• D. population size

Which of the following is obtained from rubber tree?

• A. fibre
• B. latex
• C. sisal
• D. silk

Which of the followings is not an advantage of Introduction

• A. It enhances greater productivity
• B. It leads to the absence of pests and diseases
• C. It may not perform maximally
• D. Breeds may perform better in terms of quality and quantity

Some cassava tubers are poisonous to non-ruminant because they contain

• A. hydrochloric acid
• B. hydrocyanic acid
• C. sodium chloride
• D. sodium hydroxide

Which of the following is not an effect of over-graing on soil?

• A. Improvement of soil structure
• B. soil compaction
• C. exposure of soil to erosion
• D. depletion of soil nutrients

The freshly cut forage crops fed to livestock in their housing units are referred to as

• A. paddock grazing
• B. rotational grazing
• C. silage
• D. soilage

Which of the following will not be a reason for afforestation?

• A. population pressure
• B. soil fertility conservation
• C. wildlife conservation
• D. prevention of natural hazard