Science Class 7 English

  CBSE Class 7 Science Revision Notes  CHAPTER – 1 Nutrition in plants   Nutrition:   It is the mode of taking food by an organism and its utilization by the body. Nutrients:   The components of food that provide nourishment to the body. All organisms take food and utilise it to get energy for the growth and maintenance of their bodies. Green plants synthesise their food themselves by the process of photosynthesis. They are  autotrophs . Photosynthesis : Green plants prepare their own food with the help of  chlorophyll (found in green plants),  carbon dioxide and water taken from the environment in presence of sunlight . This process is known as photosynthesis. Plants use simple chemical substances like carbon dioxide, water and minerals for the synthesis of food. Chlorophyll and sunlight are the essential requirements for photosynthesis. Complex chemical substances such as carbohydrates are the products of photosynthesis. Solar energy i...

  CBSE Class–VII Science NCERT Solutions CHAPTER-1 NUTRITION IN PLANTS Question 1.  Why do organisms need to take food? Answer:  Organism needs food to (i) Get energy to do work. (ii) Build body (iii) Repair damage in the body (iv) Maintain the functions of the body Question 2.  Distinguish between a parasite and saprophyte. Answer: Parasite Saprotroph The organism that grows on the body of another organism and derives nutrients from it is known as a parasite  The organism that obtains nutrients from the dead or decaying organic matter is called saprotroph. They directly feed on living organisms for their nutrition. They feed on dead and decaying organism. They take the readymade food from the host. They take the digested and decayed food. Examples:­ Cuscuta and orchids Examples:­ Fungi and some bacteria. Question   3.  How would you test the presence of starch in leaves? Answer:  Steps to test the presence of starch in leaves : Ste...

  CBSE Worksheet-01 Class – VII Science (Nutrition in Plants) Plants prepare their food by the process of Respiration Photosynthesis Transpiration All of these. The organism that can prepare their own food are called Heterotrophs Consumers Decomposers Autotrophs Which of the following is not required by plant for food synthesis? Water Oxygen Carbon dioxide Chlorophyll Which one is an insectivorous plant? Banyan tree Cuscuta Pitcher plant Neem plant Match the following. Column A Column B a. Autotrophs i. Tiger b. Heterotrophs ii. Mushroom c. Carnivores iii. Cuscuta d. Saprophytes iv. Green plants e. Parasite v. Animals Fill in the blanks Green plants are called ________, since they synthesize their own food. Oxygen is released by plants during ________. ________ live on dead and decaying animals. ________ is the green coloured pigments present in leaves. The food synthesized by the plants is stored as ________. What is photosynthesis? Distinguished between parasite and saprophytes. ...

  CBSE Class 7 Science Revision Notes  Chapter – 2 Nutrition in Animals Classification based on Eating Habits: (i)  Herbivorous: A nimals that eat plants or plant products. Example: cow, sheep, goat, deer, elephant, kangaroo, giraffe, etc. (ii)  Carnivorous:  Animals that eat only flesh of other animals. They never eat plants. Example: tiger, lizard, lion, etc. (iii)  Omnivorous:  Animals consume plants as well as other animals as their food. Example: bear, dog, human being, etc. (iv)  Parasites:  Organisms that obtain their food from other animals either by living inside (endoparasites) or outside (ectoparasites) their body. Example: tapeworm and roundworm (inside body), tick and lice (outside body).(v)  Scavengers:  Animals which feed on the remains of dead animals preyed by predators. Example: vulture, crows, jackal, etc.   Animal nutrition includes nutrient requirement, mode of intake of food and its utilisation in the body...

  CBSE Class–VII Science NCERT Solutions CHAPTER-2 NUTRITION IN ANIMALS Question 1.  Fill in the blanks: (a) The main steps of nutrition in humans are _____, ______, _______, _____ and _____ . (b) The largest gland in the human body is ____________. (c) The stomach releases hydrochloric acid and ________ juices which act on food. (d) The inner wall of the small intestine has many finger-like outgrowths called  _______.  (e) Amoeba digests its food in the ________. Answer:  Fill in the blanks: (a) The main steps of digestion in humans are  ingestion ,  digestion ,  absorption ,  assimilation  and  egestion . (b) The largest gland in the human body is  liver . (c) The stomach releases hydrochloric acid and  digestive  juices which act on food. (d) The inner wall of the small intestine has many finger-like outgrowths called  villi . (e) Amoeba digests its food in the  food vacuole . Question 2. ...