Question 1 (b)
Five blanks filled: the pyramid of energy, the Ramsar Convention, the decibel, the ten per cent law, World Ozone Day
5 marks
- Time to write
- About 10 minutes
Question
Question 1 (b) · 5 marksFill in the blanks: 1×5=5
- The pyramid of........................ is always upright.
- The Ramsar Convention is an international treaty meant for the protection of..................
- The loudness of noise is measured in the unit of....................
- In any food chain,.................... percentage of energy gets transferred from a trophic level to the next one.
- World Ozone Day is observed on....................
Reworded from the university paper; the task is the same. The original paper belongs to the University of Delhi. See DU's question bank.
Before you write
Read off the question and its marks
Read from the question
- (i)–(v)5 items, each marked on its own: give each its share.
Write it in this order
The parts stand alone: start with the one you are surest of.
- Read; underline the asks; jot your points 1 min
- 1 (i) Pyramid of energy 1 mark 2 min
- 2 (ii) Ramsar Convention 1 mark 2 min
- 3 (iii) Decibel 1 mark 2 min
- 4 (iv) Ten per cent law 1 mark 1 min
- 5 (v) World Ozone Day 1 mark 1 min
- Check: every ask answered, key terms underlined 1 min
Short on time? A few lines on every part beat a full answer to one: each part is capped at its own marks.
Try it first. About 10 minutes for 5 marks. Write it out, then open the solution.
Solution
Hover or tap a marked figure, like 72,000, to see how it is made and where else it appears.
(i) Energy. At each step up a food chain only part of the energy is handed on, so a higher trophic level always holds less energy than the level beneath it; drawn as bars, the pyramid can never stand on its point.
(ii) Wetlands. The treaty is named after Ramsar, a town in Iran, where it was signed in 1971 on 2 February, the date now kept as World Wetland Day; member countries list their wetlands of international importance under it for protection.
(iii) Decibel (dB). Sound and its loudness are measured in decibels; heavy traffic or firecrackers in a festival season are loud examples.
(iv) Ten (10). By the ten per cent law, a trophic level passes on to the one above it only about a tenth of the energy it holds; after a few such steps so little is left that a grazing food chain can support only a small number of levels.
(v) 16 September. The date is World Ozone Day. The United Nations set it aside as the International Day for the Preservation of the Ozone Layer, and it marks the Montreal Protocol of 1987, which controls ozone-depleting substances.
Where the 5 marks sit
| # | Component | Marks |
|---|---|---|
| 1 | (i) Pyramid of energy | 1 |
| 2 | (ii) Ramsar Convention | 1 |
| 3 | (iii) Decibel | 1 |
| 4 | (iv) Ten per cent law | 1 |
| 5 | (v) World Ozone Day | 1 |
| Total | 5 |
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