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  Ch 3 Reproduction in animals Keywords 1. Mammals: Animals that give milk and give birth to young ones 2. Reptiles : Animals that lay eggs and crawl on the ground 3. Moulting : removing old skin 4. Metamorphosis : the process of transformation from an immature state to an adult. Answer the following questions Q1. What is reproduction? Ans. A process in which species produce of their own kind. Q2. Why do animals reproduce? Ans. Animals reproduce to maintain their continuity. Q3. What helps an embryo to nourish inside a birds egg? Ans. Yolk nourish embryo inside the egg. Q4. Why do birds sit on their eggs? Ans. They sit on their eggs to provide warmth to the egg. Q6.How do mammals take care of their young ones? 1. They feed their young ones with milk 2. They protect them from enemies. 3. They help them to find food 4. They teach them to live their own 5. Males hunt for food Q7. What are the different stages of development in a frog? Name th...

  Chapter 3                         India the Northern plains Keywords 1. Plains: low-level land 2. Dam: a wall to hold back water 3. Tributary: a river that flows into a large river Answer the following Questions Q1. Name the states that lie in the Northern Plains Ans.  Punjab Haryana Uttar Pradesh Uttarakhand Bihar West Bengal and Assam Q2.  Name the river that flows in the Northern Plains Ans. Satluj 🌊 , Beas, Ganga, Yamuna, Kosi, Gomti, Brahmaputra, etc. rivers in the Northern plains. Q3. Mention the three basins of the Northern plains Ans. 1. Satluj basin 2. Ganga basin 3. Brahmaputra basin Q4. Name the delta formed by the Rivers Ganga and Brahmaputra. Ans. Sunder bans delta Q5. Write down the names of festivals famous in Punjab. Ans. Baisakhi, Diwali and Dussehra Q6. Name any three of the following. a. Main rivers ba...

  Chapter 10: Motion and Measurement of distances Keywords Q1. Give two examples each, of modes of transport used on land, water and air. Solution: Land- Train, Bus Water- Ship, Boat Air- Helicopter, Aeroplane Q2. Why can a pace or a footstep not be used as a standard unit of length? Ans. Pace or a footstep cannot be used as a standard unit of length because it varies from person to person. Q3. Arrange the following lengths in their increasing magnitude: 1 metre, 1 centimetre, 1 kilometre, 1 millimetre. Ans. 1 millimetre, 1 centimetre, 1 metre, 1 kilometre Q4. Give two examples of periodic motion. Ans. a) A needle of a sewing machine b) Pendulum Q5. The height of a person is 1.65 m. Express it into cm and mm. Ans. 1.65= 165 cm = 1650 mm Q6. The distance between Radha’s home and her school is 3250 m. Express this distance into km. Ans. 1km = 1000 m Hence 3250 m = 3.25 kms. Q7. While measuring the length of a knitting needle, the reading of the s...

  Ch 1: The green plant producer of food Q1. What is called the kitchen of the plants? Ans. Leaves are called the kitchen of plants Q2. Define leaf blade. Ans. The flat part of the leaf. Q3. What is midrib? Ans. The central vein of the leaf. Q4. How will you define photosynthesis? Ans. The process of making food by the plants in the presence of Sunlight and by the use of carbon dioxide, water and Minerals. Q5. What are parasites? Ans. Organisms which drive their food from other living organisms are called parasites. Q6. Draw the structure of the leaf showing its various parts Ans. Q7. What is needed by leaf to make food? Ans. Leaf needs Sunlight, Water air and Mineral to make food. Q8. How does dodder get its food? Ans. It takes the food prepared by the green plants. Q9. What is the function of stomata? Ans. Stomata help in the exchange of gases and transpiration Q10. From where do non-green plants get their food? Ans. Plants like mushrooms get their food fr...