Question 1 (a)
Five blanks filled: food web, biosphere, the Ramsar Convention, soil erosion, a keystone species
5 marks
- Time to write
- About 10 minutes
Question
Question 1 (a) · 5 marksFill in the blanks: (1×5=5)
- The interconnected network of various food chains is termed as __________.
- The thin layer of the earth, which consists of air, land and water and that supports life is known as __________.
- __________ Convention is the international treaty for the protection of wetlands.
- The removal of the top layer of soil through the action of wind or water is known as __________.
- __________ is an example of a keystone species.
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
- (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; underline the asks; jot your points 1 min
- 1 (i) Food web 1 mark 2 min
- 2 (ii) Biosphere 1 mark 2 min
- 3 (iii) Ramsar Convention 1 mark 2 min
- 4 (iv) Soil erosion 1 mark 1 min
- 5 (v) Keystone species 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) Food web. Food chains in an ecosystem are linked to one another, because many animals eat more than one kind of food; this interconnected network is the food web.
(ii) Biosphere. It is the relatively thin layer of the Earth, taking in air, land and water, in which life can exist.
(iii) Ramsar. The Ramsar Convention on Wetlands of International Importance was signed at Ramsar, Iran, on 2 February 1971.
(iv) Soil erosion. It is the movement of the surface litter and topsoil from one place to another by wind or flowing water, greatly speeded up by farming, construction, overgrazing and deforestation.
(v) Ficus (fig trees). Ficus trees bear fruit through the year and feed many animals when other trees have none, so they support a large part of the food web and are called keystone species. A peepal or banyan tree full of birds shows this.
Where the 5 marks sit
| # | Component | Marks |
|---|---|---|
| 1 | (i) Food web | 1 |
| 2 | (ii) Biosphere | 1 |
| 3 | (iii) Ramsar Convention | 1 |
| 4 | (iv) Soil erosion | 1 |
| 5 | (v) Keystone species | 1 |
| Total | 5 |
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