Science

Question: What is waste water? How it is produced? Schematically represent the process of waste water treatment. Answer: The used water that comes into drains from bathroom, toilets and kitchen. The process is: The waste water sewage reaches through domestic sewerage’s. Bar screens are used to remove large substances like cans …

NCERT 7th Class (CBSE) Science: Time and Motion – Quiz 19 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Time and Motion – Quiz: Time Period: The time taken by a pendulum to complete one oscillation. Oscillation: One complete to and fro motion of a pendulum bob from its mean …

NCERT 7th Class (CBSE) Science: Wastewater Management – Quiz 24 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Wastewater Management – Quiz: Waste water from houses, industries, hospitals etc. and lain water that runs over land containing waste matter such as excreta. It is necessary to treat sewage …

NCERT 7th Class (CBSE) Science: Transportation in Animals and Plants – Quiz 25 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Transportation in Animals and Plants – Quiz: There are small openings on the lower surface of the leaves. These pores are called stomata. These openings are surrounded …

Question: Explain how soil is formed. Answer: Soil is formed through the process of weathering. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. This physical and chemical decomposition is primarily done by wind, water, and climate. As …

NCERT 7th Class (CBSE) Science: Soil – Quiz 11 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Soil – Quiz: Reduce the use of plastics: Plastics and polythene bags destroy the fertility of soil. Hence, these should be disposed off properly and if possible, their use should be …

Question: Why is transport of materials necessary in a plant or an animal? Explain. Answer: Transport of materials is necessary for plants or animals because due to it the nutrients and oxygen are made available to all the parts of the body. If the transport of necessary nutrients and oxygen does …

NCERT 7th Class (CBSE) Science: Electric Current and its effects – Quiz 32 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Electric Current and its effects – Quiz: An electric Circuit is a continuous conducting path for electric current. If current flows from point A to point B …

NCERT 7th Class (CBSE) Science: Respiration in Organism – Quiz 21 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Respiration in Organism – Quiz: In yeast, the cellular glucose is converted into alcohol and carbon dioxide which give us energy. Stomata apparatus means stomata along with nearby guard …

Question: What do you mean by ‘stomata’ apparatus? Answer: Stomata apparatus means stomata along with nearby guard cells and other cells. Question: What are the main organs of the respiratory system? Answer: Main organs that help in respiration are : Nostrils (The passages in the nose) Trachea (Windpipe) Bronchi Lungs Question: …