Science Lower Secondary Checkpoint - Practice test 12

(a) (i) Name the organ labelled A.

(a)  

(a) (ii) Name the waste product that organ A removes from the body.

(a)  

(b) Scientists use models to explain how things work.

The diagram shows apparatus and materials used to model the excretory system.

The rice grains, lentils and sugar are added to a beaker of water and stirred.

The mixture is poured through the sieve.

(i) Categorize each material or piece of apparatus to the part of the human

excretory system it represents.

Draw only four lines.
Drag and drop each item into the correct category.

Groups:

(a) blood cells

,

(b) kidney

,

(c) waste product

• lentils

• sugar

• rice grains

• sieve

(b) Scientists use models to explain how things work.

The diagram shows apparatus and materials used to model the excretory system.

The rice grains, lentils and sugar are added to a beaker of water and stirred.

The mixture is poured through the sieve.

(ii) Describe how this model shows the function of the human excretory system.

(a) Use the Periodic Table to write the electronic structure of aluminium, Al.

(b) How many protons are in an atom of fluorine, F?

(a)  

(c) A sodium atom, Na, forms a sodium ion, Na+.

Describe, in terms of electrons, how a sodium ion is made from a sodium atom.

(a) Which symbol shows an ammeter?

Choose from A, B, C or D.

(a)  

(b) What is the name of the component shown by symbol C?

(a)  

Mia wants to measure the voltage across a lamp.

Complete the circuit diagram to show how Mia connects a voltmeter to measure the voltage

across the lamp.