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(i) ans) Animals that eat plants exclusively are herbivores, and animals that eat only meat are carnivores. When animals eat both plants and meat, they are called omnivores. ... These carnivores may eat insects and worms. Carnivorous animals have strong jaws and sharp teeth to enable them to tear and rip prey.
2ans) Peristalsis, involuntary movements of the longitudinal and circular muscles, primarily in the digestive tract but occasionally in other hollow tubes of the body, that occur in progressive wavelike contractions. Peristaltic waves occur in the esophagus, stomach, and intestines.
3ans)Groundwater is a prime natural resource in the Earth. It not only supports all types of life forms to exist in the Earth but also helps in the growth of human civilization. It quenches thirst and fulfils all the house-hold demands. Groundwater is used for the irrigation purposes.
4ans) Groundwater depletion most commonly occurs because of the frequent pumping of water from the ground. ...
We continuously pump groundwater from aquifers and it does not have enough time to replenish itself. ...
Agricultural needs require a large amount of groundwater.
5ans)Direct causes of deforestation are agricultural expansion, wood extraction (e.g., logging or wood harvest for domestic fuel or charcoal), and infrastructure expansion such as road building and urbanization. Rarely is there a single direct cause for deforestation
6ans)Conservation of forest is the practice of planting more trees and maintaining the forested areas for the sustainability for future generations. ... This felling of trees can be regulated by selective cutting, clear-cutting and shelterwood cutting. Forest fires are one of the common causes of loss of forests.Overgrazing by animals in the forests should be stopped.
All activities leading to soil erosion must be stopped.
While constructing dams, roads and mining, all ecological factors must be stopped.
Large scale cutting of Forest trees must be stopped.
Forest must be protected from insects and pests.
7 ans)The main causes of water pollution in the Ganga river are the disposal of human sewage and animal waste, increasing population density, and disposal of industrial waste into the river.
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