Question 1 (b)
True or false: evergreen canopy, Chernobyl, the nitrogen reservoir, geothermal energy, BOD
5 marks
- Time to write
- About 10 minutes
Question
Question 1 (b) · 5 marksState whether each of the following is True or False (1 × 5 = 5)
- The tropical evergreen forests have a thick canopy cover.
- The Chernobyl disaster is an example of nuclear disaster.
- Soil is the main reservoir of nitrogen.
- The geothermal energy is a non-renewable source of energy.
- BOD works as an indicator of organic pollution in the water bodies.
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
- State whether…A verdict for each (True or False), then the reason that decides it.
- (1×5=5)1 items at 5 marks each: give each its share.
- exampleExamples are asked for: one short example with each point.
Write it in this order
The parts stand alone: start with the one you are surest of.
- Read each statement; find the word that decides it 1 min
- 1 (i) Verdict and reason 1 mark 2 min
- 2 (ii) Verdict and reason 1 mark 2 min
- 3 Item iii 1 mark 2 min
- 4 (iv) Verdict and reason 1 mark 1 min
- 5 (v) Verdict and reason 1 mark 1 min
- Check: a verdict and a reason for every statement 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)True In a tropical evergreen forest the tree crowns overlap to form a continuous canopy, so very little light reaches the forest floor and only shade-loving plants grow there.
(ii)True The Chernobyl disaster of 1986, at a nuclear power station in the former USSR, is the best-known example of a nuclear disaster: the reactor's energy surged, the fuel rods ruptured and radioactive material was released.
(iii)False The main reservoir of nitrogen is the atmosphere, which is about 79 per cent nitrogen; soil holds only a small part.
(iv)False Geothermal energy, the heat from inside the earth, is a renewable source, grouped with hydro, solar and wind power.
(v)True BOD (biochemical, or biological, oxygen demand) is the amount of oxygen needed to break down the organic matter in water, so the more organic waste a water body carries, the higher its BOD; that is why BOD is one of the parameters, with limits, by which treated effluent and leachate are tested before discharge.
Where the 5 marks sit
| # | Component | Marks |
|---|---|---|
| 1 | Item (i) | 1 |
| 2 | Item (ii) | 1 |
| 3 | Item (iii) | 1 |
| 4 | Item (iv) | 1 |
| 5 | Item (v) | 1 |
| Total | 5 |
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