Science

Question: What is combustion? Answer: The process of burning of substances in air or oxygen with the evolution of heat and light is known as combustion. Question: Distinguish between combustible and non-combustible substances, giving three examples of each. Answer:  Question: Why is it more difficult to burn some combustible substances than others? Answer: Different substances …

NCERT 8th Class (CBSE) Science: Coal and Petroleum – Quiz 22 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Coal and Petroleum – Quiz: Material found on the earth that allow the existence of life and satisfy the needs of living organisms are called natural resources. Renewable resources are …

Question: Classify various materials we use in our lives. Answer: All the materials we use can be broadly classified into two groups: Natural Resources: Natural resources are those resources which are present in our nature, gifted by God. They can be freely used. Soil, air, sunlight, water, etc., are some natural …

NCERT 8th Class (CBSE) Science: Reaching the Age of Adolescence – Quiz 19 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Reaching the Age of Adolescence – Quiz: The endocrine system consists of a number of ductless glands that secrete hormones. The hormones control several processes in the body. …

Question: What do you understand by ‘puberty’? Answer: The stage of life when the body becomes capable of reproduction is known as puberty. Question: Why is looking after physical health more important at adolescent age? Answer: Walking, jogging, aerobics, outdoor games etc, are good for the growing adolescent body. Question: Discuss the …

NCERT 8th Class (CBSE) Science: Reproduction – Quiz 33 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Reproduction – Quiz: Reproduction is the process of producing new individuals of the same kind. Sexual reproduction involves two parents – one male which produced the sperm, and one female which …

Question: Name three natural methods of adding nutrients to soil. Answer: The three natural methods of adding nutrients to soil are: Field fallow, Crop rotation and Mixed cropping. Question:  What are weeds? Answer: The unwanted plants that grow along with the crops and share nutrients are called weeds. Weeds decrease the crop …

NCERT 8th Class (CBSE) Science: Crop Production – Quiz 23 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Crop Production – Quiz: Agriculture began 10,000 years ago and enabled humans to settle down in one place. Horticulture deals with the production of vegetables, fruits, flowers and decorative plants. Crop …

Question: Why is reproduction important? Answer: Reproduction is important for producing new individuals of the same kind. Question: How is sexual reproduction different from asexual reproduction? Answer: Sexual reproduction requires two parents, one male and one female, to reproduce. Whereas in Asexual reproduction only one parent is required to reproduce. …

NCERT 8th Class (CBSE) Science: Cell- Structure and Functions – Quiz 38 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Cell- Structure and Functions – Quiz: All living organisms are made up of one and more cells. In unicellular organisms, a single cell performs all life functions. In multicellular organisms, …