Question 1 (a)
Five definitions: primary productivity, forest ecosystem, non-renewable energy, nutrient cycling, minerals
5 marks
- Time to write
- About 10 minutes
Question
Question 1 (a) · 5 marks1 (a) Define any five of the following (1 x 5 = 5)
- Primary productivity
- A forest ecosystem
- Hazardous waste
- Non-renewable energy
- The nutrient cycling
- Minerals
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
- any fiveAnswer any 5 of the 6, 1 marks each. Only 5 are marked: a sixth earns nothing.
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 Primary productivity 1 mark 2 min
- 2 Forest ecosystem 1 mark 2 min
- 3 Non-renewable energy 1 mark 2 min
- 4 Nutrient cycling 1 mark 1 min
- 5 Minerals 1 mark 1 min
- Check: every ask answered, key terms underlined 1 min
Easy marks
- Choose the ones you know best: each carries the same marks.
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.
Five of the six are defined, as the question allows.
The rate at which producers (green plants) capture solar energy and build organic matter (biomass) in an ecosystem; gross primary productivity is the total made in photosynthesis, and net primary productivity is what is left after the plants' own respiration.
A natural ecosystem formed by a community of plants structurally dominated by trees, with shrubs, climbers and ground cover, together with the animals, microbes, soil, water and climate that interact with them.
Energy from sources that are used up faster than nature can form them again, chiefly the fossil fuels coal, oil and natural gas, which were formed from prehistoric plant life over very long periods.
The continuous movement of nutrients such as carbon, nitrogen and water between living organisms and the air, water and soil; decomposers return nutrients locked in dead matter to the soil so that new life can use them.
Naturally occurring substances with a definite chemical composition and identifiable physical properties, such as iron ore or limestone, found in the earth's crust.
Where the 5 marks sit
| # | Component | Marks |
|---|---|---|
| 1 | Primary productivity | 1 |
| 2 | Forest ecosystem | 1 |
| 3 | Non-renewable energy | 1 |
| 4 | Nutrient cycling | 1 |
| 5 | Minerals | 1 |
| Total | 5 |
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