In the below diagram, what crop roots are represented?

• A. a legume
• B. a cereal
• C. a tuber
• D. a spice

Insect-pests of crops could be controlled by

• A. cover-cropping
• B. mulching
• C. crop rotation
• D. organic manuring

If rows of crops are spaced 1.0m apart with one seed sown per stand, determine the spacing between stands to obtain a plant population of 40,000 plants per hectare.

• A. 0.25m
• B. 0.45m
• C. 0.50m
• D. 1.00m

Which of the following methods of plant propagation is limited to plants which root easily?

• A. Grafting and cutting
• B. Layering and cutting
• C. Budding and layering
• D. Grafting and layering

(a) Draw a well labelled diagram of the water cycle

(b) Mention two deficiency symptoms of phosphorus in crops

(c) Using the table below, classify the follow-ing insect-pests according to their modes of feeding (i) weevil (ii) locust (iii) scale insect (iv) armyworm (v) earworm (vi) cotton stainer (vii) green spidermites (viii) thrips (ix) capsids (x) yam beetle

Heat treatment of oil palm seeds before sowing helps to

• A. mobilize nutrients for the embryo
• B. harden the mesocarp
• C. break embryo dormancy
• D. improve disease resistance

Maize is a very important crop because apart from serving as a staple, it

• A. is ploughed into the soil to increase fertility
• B. can be processes into corn flakes
• C. forms the base of most livestock feeds
• D. is used for producing germ oil

A breeding method which involves the production of heterozygous populations from homozygous lines is

• A. inbreeding
• B. introduction
• C. selection
• D. hybridization

The parasite illustrated below obtains nutrients from the host through

• A. osmosis
• B. diffusion
• C. capillarity
• D. egestion

Which of the following statements is not correct about soil texture?

• A. Soils with fine particles have higher water holding capacity than coarse soils
• B. Fine-textured soils are warm soils and coarse-textured soils are cool soils
• C. The effect of leaching in coarse-textured soils is greater than that in fine-textured soils
• D. Fine-textured soils have higher nutrient holding capacity than coarse-textured soils.