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8 exam (3) (1)

Angels International College
Cambridge Sciences 8
Name _________________
Q.1 Choose the best answer. [5*1]
1. Magnesium is a mineral salt that is commonly added to fertilizer, so plants can
a) make chlorophyll
b) strong cell walls
c) develop stronger root system
2. Root hair cells are specialized cells for plant growth because
a) they have a large surface area for absorbing water and nutrients
b) they have a large surface area to allow for greater photosynthesis
c) they keep growing until they reach water and nutrients
3. The function of the anther is to:
hold the filament
produce pollen
trap pollen grains
attract pollinators
4. In the figure below, write the number of electrons, protons and neutrons. What is the atomic no. of this
element? Identify the element name.
Number of Electrons _________
Number of Protons _________
Number of Neutrons _________
Atomic Number
Element Name
5. Potted plants are left for a week in a tank of water as shown.
Why do the plants die?
A The roots do not have enough oxygen.
B The roots do not have enough water.
C The roots have too much oxygen.
D The roots have too much carbon dioxide.
Q.2 Fill in the blanks with the correct words [5*1]
1.The periodic table is defined as_________________________________
2.Using Mendeleev’s system elements with similar___________________ ______________________
properties fell into families or groups.
3. Metals are found on the __________________ side of the table, while the nonmetals are found on the
___________________ side of the table.
4. Producing seeds is a type of___________________ in plants
5.The green pigment chlorophyll is found in tiny structures in the cells of leaves called
Q.3 (a) The boxes show some parts of plants and the function of the parts.
Draw a line from each part to match its function. [2]
(b) Complete the word equation for photosynthesis. [1]
Q.4. Draw the structure of Carbon , Calcium, Sulphur Elements. Mention their number of
protons, number of electrons and the atomic number. [3]
Look at the table. It shows the melting points and boiling points of some elements.
element melting point in °C boiling point in °C
(a) Write down the name of the element that melts at 1538°C. [1]
(b) Which element is a liquid at room temperature (20°C)? [1]
(c) Which element is a non-metal? [1]
Q. 6. The diagram shows an experiment to investigate the balance between respiration and
photosynthesis. [2]
In which tube are photosynthesis and respiration taking place at the same time?