TERM
TEST
DATE: 16 MARCH 2016
NATURAL
SCIENCE GRADE 8
TOTAL 50
QUESTION 1
Define the following terms
A). photosynthesis (2)
b). Interaction
(2)
C). Consumers (2)
D). Respiration
(2)
E). herbivores (2)
TOTAL 10
Question 2
Read the information box and then answer the
questions.
An
ecosystem is a complex interaction of living organisms and non-living matter.
This diagram explains how an ecosystem is organised. Organisms which belong
to a single species and which live in one particular area are called
populations. In this example, the sunflower is the organism. Many sunflowers
growing in a field is called a population of sunflowers. If you take many
different populations, such as the population of sunflowers, the population
of ducks and the population of a certain species of tree, all living in one
area, you have a community. Many different communities, together with the
non-living, or abiotic factors, in one area, is called an ecosystem. In this
example, the sunflowers, the ducks, the trees and the grass, together with
the river, the clouds, the sun, the slope of the land – these all make up the
ecosystem. Many different ecosystems form biomes and all the biomes on the
planet make up the biosphere – the part of the planet that sustains life.
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Read these statements and decide which are TRUE and
which are FALSE. If a statement is FALSE, correct it to make it TRUE
1.
A herd of zebra living on a game farm
is a population.
(1)
2.
An ecosystem is made up of living
organisms.
(1)
3.
Ecosystems can differ in size.
(1)
4.
The cats and the dogs living in your
suburb form a population. (1)
5.
Temperature is an abiotic factor. (1)
6.
When we talk about a community, it is
incorrect to say that soil and acid rain are part of the community. (1)
7.
The oceans are not part of the
biosphere.
(1)
8.
A forest is an example of an
ecosystem. (1)
9.
A beach and the tidal zone is an
ecosystem. (1)
Total 10
QUESTION 3
A FOOD WEB
1. This
is an example of a food web. How does it differ from a food chain? (2)
2. What
inter-relationships does this food web show that a food chain does not? (2)
3. What
would happen if all the snakes were killed in this ecosystem? (1)
4. What
happens to this ecosystem when the farmer harvests his crops? (1)
5. Which
animals are directly reliant on the mouse for food? (3)
6. Which
animals are indirectly reliant on the mouse for food? (1)
Total 10
QUESTION 4
The diagram below is a mind-map of the carbon cycle
1.
Start with green plants and write a
paragraph describing the role each coloured block or circle plays in the carbon
cycle (10)
QUESTION 5
Study the following diagram showing how we classify organisms on earth and answer the questions that follow
Study the following diagram showing how we classify organisms on earth and answer the questions that follow
1. Do you see that the organisms in the diagram are divided into five groups ? what do we call these five groups ? (5)
2. Which groups do you think contain organisms which can be classified as micro organisms? (2)
3. Do you think micro organisms are living or non-living? give reasons for your answer. (3)
Total: 10 Marks
