An octopus appears to be just a huge head with eight long, fearful arms. Its head is soft and rubberlike. Its eyes stick out on stalks so that it can see in all directions. Its mouth is on the underside of its body and has powerful jaws shaped like a beak. The long arms, or tentacles, have double rows of suckers. These can fasten onto objects with such suction that they cannot be pulled off.

The liver is the largest organ in the body. It weighs a little more than three pounds in an adult. It is wedge-shaped and is situated under the diaphragm, mostly on the left side of the body, where it is protected by the lower ribs. Somewhat like an intricate chemical factory, the liver takes the particles of glucose (which come from digested starches and sugars) and changes them into another kind of carbohydrate called glycogen , which it then stores. When the body needs sugar, the liver turns the glycogen into glucose again and sends it to the body tissues through the bloodstream.

The Leclanché cell consists of a leakproof jacket containing a porous pot in which there is a paste of manganese dioxide and carbon granules surrounding a carbon rod . The top can be sealed with pitch. A zinc rod stands in a solution of ammonium chloride, and is connected to the carbon rod via a circuit and a light bulb . The zinc dissolves in the solution, setting up an electromotive force. The ammonium ions migrate to the carbon anode and form ammonia (which dissolves in the water), and hydrogen ions. Torch dry batteries and use wet paste cells of the Leclanché type.

A 12-volt car battery has six two-volt cells connected in series. The cells have anodes of brown lead oxide and cathodes of porous grey lead immersed in sulphuric acid. An electric current flows if the electrodes are connected through a conductor. When the battery supplies current the sulphuric acid converts the anode to lead sulphate, thus reducing the strength of the acid. This process is reversed during recharging. Each cell of the battery is made of several anodes and cathodes separated by porous insulators. The cells are housed in a hard rubber case and the various cells are interconnected with lead bars.

A is

adjacent to
alongside
below
beyond
facing (diagonally)
parallel to
underneath
opposite
in the middle of
on the right of
on the left of
near
close to
touching
behind
in front of
under
on top of
above
below
level with
diagonally above
vertically below

B

between
equidistant from

B and C.

X

is

nailed
screwed
fixed
fastened
linked
welded
tied
connected
attached

to

Y

by

Z

consists

of

Y and Z

contains
includes

is

held in place
secured
supported
suspended

by

Y

joined

to

mounted
placed
pivoted

on

X

is

dark
light
pale
bright
dull

green.
blue.
red.
yellow.

X

is

made of

metal.
steel.
alluminium.
an alloy of A and B.
cloth.
silk.
china.
wood.
plastic.
glass.

X

is

6 cm

long
high
wide

X

is

6 cm

in

length
height
width
diameter

6 Kg

weight

The

length
height
width
diameter

of

X

is

6 cm

weight

6 Kg.

X

has

a

length
width
height
diameter

6 cm.

weight

6 Kg.

X

weighs

10 Kg

X

is

square
round
rectangular
triangular
semi-circular
conical
spherical
hexagonal
octagonal
oval
circular
irregular

in shape

X

is

is shaped like a

square
circle
rectangle
triangle
semi-circle
hexagon
octagon

X

is

cubical
cylindrical
pyramidal
spherical
tubular
spiral
hemispherical
conical

in shape

X

is

bulbous
tapering
concave
convex

in shape.

diamond-shaped
kidney-shaped
U-shaped
star-shaped
bell-shaped
dome-shaped
mushroom-shaped
X-shaped
crescent-shaped
egg-shaped
pear-shaped
Y-shaped

The

function
purpose
aim
objective

of the

thermometer
tripod

is to

measure the temperature.
hold the beaker.

The

thermometer
tripod

is used for

measuring the temperature.
holding the beaker,

X is

light

tough

soft

elastic

malleable

flexible

soluble

a good conductor of electricity/heat

corrosion resistant

combustible

transparent

smooth

heavy

brittle

hard

plastic

ductile

rigid

insoluble

a bad conductor of electricity/heat

not corrosion resistant

non-combustible

opaque

rough