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State the scientific and eco-friendly methods of waste management.
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How will you register individual participation in solid waste management?
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Match the items in column ‘A’ with the proper ones in column ‘B’ and explain their impact on the environment.
| Column ‘A’ | Column ‘B’ |
| 1. Harmful waste | a. Glass, rubber, carry bags, etc. |
| 2. Domestic waste | b. Chemicals, pigments, ash, etc. |
| 3. Biomedical waste | c. Radioactive material |
| 4. Industrial waste | d. Leftover food, vegetables, peelings of fruits. |
| 5. Urban waste | e. Bandages, cotton, needles, etc. |
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Explain the difference between the excretory system of humans and plants.
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Explain in your own words with suitable examples.
How does excretion occur in human beings?
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Explain in your own words with suitable examples.
How is excretion in plants useful to human beings?
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Form pairs.
| ‘A’ Groups | ‘B’ Groups | ||
| (i) | X-rays | (a) | GMRT |
| (ii) | Optical Telescope | (b) | ISRO |
| (iii) | Indian radio | (c) | Hubble |
| (iv) | Launching artificial satellites | (d) | Chandra |
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A certain X-ray telescope is named after scientist ______.
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Answer the following question in your own words.
Describe the structure of the DNA molecule.
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Answer the following question in your own words.
Express your opinion about the use of DNA fingerprinting.
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The number of molecules of water of crystallization in washing soda is ______.
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Give a scientific explanation.
The hard water of a well becomes soft on adding washing soda to it.
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Write the chemical formula.
Washing soda
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Write two physical properties which are given below.
Fullerene
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Why are concave mirrors used in solar devices?
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Why does obtaining the image of the sun on paper with the help of a concave mirror burn the paper?
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Which type of mirror is used in the following?
Floodlights
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Which type of mirror is used in the following?
Head lamps of a car
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