The use of herbicides and pesticides in farms can cause pollution
Bush-burning encourages desertification
Excessive use of fertilizers in farms may have harmful effects
Tillage of tropical soils with ploughs and harrows may encourage erosion
Monocropping is one of the cultural methods of controlling pests
Correct answer is E
No explanation has been provided for this answer.
Which of the following characteristics is associated with commensalism?
Both organisms are harmful to each other
The association involves many organisms
The association is beneficial to one of the organisms
Both species are beneficial to each other
This relationship is found only among higher plants
Correct answer is C
No explanation has been provided for this answer.
Which of the following statements is not correct about food chains?
All food chains start with a green plant
Food chains involve feeding relationships among organisms
shorter food chains indicate more effective utilization of energy than longer ones
There is no energy loss in a food chain
All food chains have primary consumers
Correct answer is D
No explanation has been provided for this answer.
parasitism
commensalism
mutualism
symbiosis
predation
Correct answer is A
No explanation has been provided for this answer.
The translocation of food materials in plants takes place in the
xylem
cambium
phloem
parenchyma
sclerenchyma
Correct answer is C
No explanation has been provided for this answer.