Please select a subject first
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“A fish dies when taken out of water whereas a wall lizard will die if kept under water.” Mention the term used to describe such abilities that allow fish and lizards to survive in their respective habitats.
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Write two common adaptive features of a polar bear which help in keeping it warm.
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Read the following statement and give the appropriate terms for them.
Accumulation of wastes in the soil generated by human activity which alters the features of soil
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Is it a good practice to remove grass and small plants that are growing in an open, unused field? Give reason to support your answer.
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Fish breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to ______.
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Earthworms and frogs breathe through their skin because of which the skin of both the organisms is ______.
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Mark the following statement as True or False. Correct the false statement.
Frogs can breathe through their skin as well as lungs
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Cockroaches breathe with the help of air tubes called ______.
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On an average, an adult human being at rest breathes 15–18 times per minute. The breathing rate, however, may differ under different conditions. Arrange the following activities given in the box in order of increasing breathing rates and give reason for your answer.
| sleeping, cycling, brisk walk, watching T.V. |
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Match the names of organisms in Column I with their organs of breathing given in Column II.
| Column I | Column II | ||
| (a) | Butterfly | (i) | Lungs |
| (b) | Earthworms | (ii) | Gills |
| (c) | Sparrow | (iii) | Spiracles |
| (d) | Fish | (iv) | Skin |
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Observe figure and answer the given questions:
- Name the instrument.
- Label parts A, B and C.
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Match the parts of the heart in Column I with the direction of flow of blood in Column II.
| Column I | Column II | ||
| (i) | Right ventricle | (a) | Pushes blood into the pulmonary artery. |
| (ii) | Pulmonary veins | (b) | Take deoxygenated blood from the heart to the lungs. |
| (iii) | Left atrium | (c) | Receives blood from different parts of the body. |
| (iv) | Pulmonary arteries | (d) | Bring oxygenated blood from the lungs to the heart. |
| (v) | Left ventricle | (e) | Pushes blood into the aorta. |
| (vi) | Right auricle | (f) | Receives deoxygenated blood from the pulmonary veins. |
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The ovaries of different flowers may contain ______.
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Unscramble the following words:
HTRCO
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Paheli does not have a night lamp in her room. She covered the bulb of her room with a towel at the night to get dim light. Has she taken the right step? Give one reason to justify your answer.
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Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?
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Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins? Give reason.
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How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.
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The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene per person per day is a minimum of
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Fill in the blanks and complete the story by selecting words from the box given here.
| cold, demand, leaders, dry, hot, scarcity, workers, wet, oceans, harvesting, rivers |
Rajasthan is a ______ and dry place. The challenge of natural ______ of water was met by a successful experiment. A band of social ______ had transformed a ______ area into a green place. They have revived five dried-up ______ by constructing water ______ structures.
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