The most active agent of physical weathering in arid regions is

• A. wind
• B. water
• C. temperature
• D. ice

Legumes that produce edible seeds are known as

• A. pulses
• B. grains
• C. cereals
• D. beverages

Biological control of insect-pests of crops is carried out through?

• A. crop rotation
• B. use of predators
• C. use of pesticides
• D. farm sanitation

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

• A. sodium
• B. molybdenum
• C. boron
• D. magnesium

The most common soil mineral found in all crystalline rocks and a main constituent of granite and sandstone is

• A. biotite
• B. quartz
• C. mica
• D. granite

Which of the following is not an objective of pasture management? To obtain

• A. the lowest possible dry matter yield of pasture
• B. the most palatable mixture of pasture crops
• C. high leaf-stem ratio
• D. the best possible nutritive value of pasture

Which of the following will not be an effect of excessive amount of water content in feeds?

• A. decrease in nutritive value
• B. formation of toxic products
• C. encouraging growyh of moulds
• D. improving quality of such feeds

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

Cow dung is usually added to a fish pond in order to encourage the growth of

• A. lichen and mosses
• B. phytoplankton and zooplankton
• C. celosia and amaranthus
• D. shallot and lilly

Ornamental plants reduce noise pollution in the environment by

• A. scattering sound energy
• B. reflecting sound waves
• C. dispersing sound waves
• D. absorbing sound energy