In ponds, fish is usually caught with the following except
Pollution
Hook and line
Fish trap
Cast net
Correct answer is A
Pollution is the contamination of the environment by releasing harmful substance into it.
The following steps are necessary when establishing a fish pond except
Moisture
Site selection
General survey
Clearing and stumping of site
Correct answer is A
STEPS IN ESTABLISHING FISH POND
-Site selection: This involves the choice of best site based on necessary conditions like, a piece of land through which a perennial stream flows.
-General survey: Detailed survey of the chosen site should be carried out, especially by extension workers.
-Clearing and stumping of site: This involves removal of trash, cutting of trees and removal of stumps.
-Construction of dam: This is usually constructed across the stream. Clay soil should be used for dam construction because of its ability to hold water.
Moisture is not needed.
Fishing methods involves the use of the following different techniques or equipments except
Netting
Trapping
Hooks and Lines
Poisoning
Correct answer is D
Poisoning is the introduction of harmful substance into organisms which can kill them.
The animal dungs are used as_____to improve the soil fertility.
Inorganic manure
Organic manure
Content
Mulch
Correct answer is B
The animal dungs and droppings are used as organic manure to improve the soil fertility for the crops.
Which of the followings is not an abiotic components of an ecosystem?
Temperature
Oxygen
Topography
Micro-organisms
Correct answer is D
Abiotic components of an ecosystem include the non-living things such as oxygen, topography, temperature. Micro-organisms are living things and they are biotic components of an ecosystem.