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Answer:
1. Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat, or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.
2.The heating effect of electric current is widely used in our day-to-day life. ... When an electric current is passed through a conductor, it generates heat due to the hindrance caused by the conductor to the flowing current. The work done in overcoming the hindrance to the current generates heat in that conductor.
3. The two main causes of Depletion of Water Table are Deforestation and Over-pumping of groundwater.
4. A curved mirror is a mirror with a curved reflecting surface. The surface may be either convex or concave. Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.
5. A forest is a piece of land with many trees. Many animals need forests to live and survive. Forests are very important and grow in many places around the world. They are an ecosystem which includes many plants and animals. Temperature and rainfall are the two most important things for forests
Answer:
ans1-Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. ... Flowers are the tools that plants use to make their seeds. The basic parts of the flower are shown in the diagram below. Seeds can only be produced when pollen is transferred between flowers of the same species.
ans2-When an electric current is passed through a conductor, the conductor becomes hot after some time and produce heat. This happens due to the conversion of some electric energy passing through the conductor into heat energy. This effect of electric current is called the heating effect of current.
ans3-Groundwater depletion most commonly occurs because of the frequent pumping of water from the ground. We pump the water more quickly than it can renew itself, leading to a dangerous shortage in the groundwater supply.
ans4-(i)-(ii) What are convex and concave mirrors? If the inner side of the spherical mirror is reflecting, it is called a concave mirror. If the outer side of the spherical mirror is reflecting, it is called a convex mirror. Image. Concave mirrors can form inverted and real images and also virtual and erect images.
ans5-a dense growth of trees and underbrush covering a large tract A fire destroyed acres of forest. forests of pine and mahogany is called forest.