A biotic factor affecting agricultural production is?

A. rainfall

B. predator

C. humidity

D. temperature

Which of the following groups of organisms are parasites plants?

A. nematode, fungus and bacterium

B. Striga, nematode and dodder

C. Dodder, fungus and striga

D. Mistletoe, fungus and bacterium

The type of rock formed from accumulation of materials transported by water is called?

A. sedimentary rock

B. igneous rock

C. metamorphic rock

D. plutonic rock

A fresh garden soil sample weighed 25kg. When oven-dried, its weight reduced to 20kg. Calculate the percentage moisture content of the soil sample.

A. 5.0%

B. 12.5%

C. 20.0%

D. 25.0%

Which of the following mineral elements is essential for chlorophyll formation?

A. calcium

B. boron

C. sodium

D. magnesium

The soil horizon that is not supportive of the growth of tree crops is?

A. horizonA.

B. horizonB

C. horizonC

D. horizonD

Liquid fertilizers and pesticides could be applied through?

A. furrow irrigation

B. channel irrigation

C. sprinkler irrigation

D. flood irrigation

In a crop rotation system, it is usually preferred that cassava comes last in the rotation because it?

A. adds nitrogen to the soil

B. is a shallow feeder

C. is a deep rooted crop

D. is a perennial crop

The growing of only one crop on a piece of land from year to year is known as?

A. mixed cropping

B. crop rotation

C. monoculture

D. shifting cultivation

In green manuring, crops are ploughed into the soil just before flowering in order to?

A. control soil pathogens

B. enrich the soil with nutrients

C. control soil erosion

D. increase the soil temperature