📘 Class 7 – Science
Q. What is nutrition?
Ans: Nutrition is the process of taking food and using it for growth and energy.
Q. Why do living organisms need food?
Ans: They need food for energy, growth, repair and survival.
Q. What are nutrients?
Ans: Nutrients are useful substances present in food.
Q. Name two main nutrients.
Ans: Carbohydrates and proteins are main nutrients.
Q. Which nutrient gives energy?
Ans: Carbohydrates give energy.
Q. Which nutrient helps in growth?
Ans: Proteins help in growth.
Q. What is photosynthesis?
Ans: Photosynthesis is the process by which plants make food.
Q. Which organisms make their own food?
Ans: Green plants make their own food.
Q. What are autotrophs?
Ans: Autotrophs make their own food.
Q. What are heterotrophs?
Ans: Heterotrophs depend on others for food.
Q. Process of breathing called?
Ans: Respiration
Q. Green pigment in plants?
Ans: Chlorophyll
Q. Unit of temperature?
Ans: Degree Celsius
Q. Force that pulls objects down?
Ans: Gravity
Q. Heat transfer through solids?
Ans: Conduction
Q. Blood vessels carrying blood away from heart?
Ans: Arteries
Q. Largest planet?
Ans: Jupiter
Q. What is evaporation?
Ans: Liquid to gas
Q. Which acid in stomach?
Ans: Hydrochloric acid
Q. Plant breathing pores?
Ans: Stomata