Name: ………………………….. Date: …………………..

Grade 6 Science Revision Sheet

Lesson 1.4: Organs in humans

Questions:

1. What is the job of the brain?

a. Breaks down food

b. Controls the activities of the body

c. None of the above

2. The …………… carries blood around the body.

a. Aorta

b. Vena cava

c. Kidney

3. In which body organ is air breathed in and out to give oxygen for respiration and gets

rid of waste carbon dioxide?

a. Stomach

b. Liver

c. Lungs

Lesson 1.5 Looking at cells:

• A microscope makes small things look bigger.

• Objective lens: makes things look bigger.

• We can use a microscope to see plant cells and animal cells.

Plant cell vs. Animal cell

• A plant cell contains a chloroplast which carries out photosynthesis.

• A chloroplast and a vacuole are structures found in a plant cell and not

found in an animal cell.

• A cytoplasm is a jelly substance found in both cells.

• A cell membrane is the outer layer of the cell.

• A nucleus is the control center of the cell.

• A cell wall helps the plant stay upright

Plant cell Animal cell

Has a vacuole have nucleus No vacuole

Has a chloroplast have cell membrane No chloroplast

Has a cell wall have cytoplasm No cell wall

Questions:

1. Choose the statement that best describes the difference between an animal cell and a

plant cell.

a. A pant cell has a chloroplast and a vacuole which are not found in an animal cell.

b. A plant cell has a nucleus while an animal cell doesn’t.

c. An animal cell has a cell wall which is not found in a plant cell.

2. A chloroplast carries out ………………. .

a. movement

b. photosynthesis

c. none of the above

3. An objective lens makes things look ……………… .

a. bigger

b. smaller

c. none of the above

Lesson 1.6 Specialized animal cells • All the cells that make up a body are not the same. They are specialized to carry out

special jobs.

• Lots of specialized cells of the same type working together make up a tissue.

• Several tissues working together in the body form an organ.

• Different organs work together to form an organ system

• Organ systems are needed to form the whole body

Cells

Tissues

Organs

Organ systems

Whole body

Specialized cells

Nerve Cell: Red blood cell:

- Carries electrical messages around the body - Has a bi-concave shape

- Has branches to connect to many other nerves - No nucleus

cells - Carries oxygen

Sperm Cell: Ciliated epithelial cell:

- Carries the genetic information - Has cilia which beat to move fluids

to the egg away from the lungs.

- Has the ability to swim.

Questions:

1. Lots of muscle cells work together to form ……………. .

a. nerve tissues

b. muscle tissues

c. none of the above

2. Which cell has a bi-concave shape?

a. White blood cell

b. Red blood cell

c. Sperm cell

3. Which statement best describes the nerve cell?

a. Has branches to connect to many other cells

b. Has a bi-concave shape to pick up oxygen

c. Has cilia to move fluids away from lungs

Lesson 1.7: Specialized plant cells • The way plants make their own food is called photosynthesis.

• Chloroplasts carry out photosynthesis.

• Cells that have a big surface area take in more substances through their surfaces like the root hair cell.

Plant cell: Root hair cell:

- Has chloroplasts, that carry out - Root hair cells are close to the transport

photosynthesis. tissue in the roots.

- The function of the root hair cell is to

absorb more and take up more water for

the plant.

Questions:

1. Specify which picture shows a root hair cell?

A. B.

a. Picture A

b. Picture B

c. Both A and B

2. A root hair cell has a …………………. to absorb more water.

a. small surface area

b. large surface area

c. no surface area

Lesson 1.8: The human skeleton

The main jobs of the skeleton:

• It supports the body: The bones of skeleton are made of a strong but slightly

flexible material that holds us up well.

• It protects delicate organs: Strong bony cages like the skull and the ribs give us

the protection we need.

Example:

The skull protects the brain.

The rib cage protects the lungs.

• It is jointed so we can move easily: The joints between the bones mean that the

skeleton allows us to move.

Questions:

State whether the following statements are True or False then correct the false onses.

1. The rib cage protects the brain from damage …………

2. The skeleton supports the body in holding it up ……….

3. A joint is where two bones meet ……….

Lesson 1.9: Muscles and joints

• To move our bones, we need muscles.

• Muscles are bundles of fibers which can contract or shorten.

• Muscles can only pull; they can’t push the bone back.

• Muscles that work in pairs against each other are called antagonistic muscles.

• When biceps contracts, triceps relaxes and pulls the lower arm up.

• When triceps contracts, biceps relaxes and pulls the lower arm down.

• Synovial fluid lubricates the joint so bones can move smoothly.

• Cartilage protects the bones.

• Ligaments hold the bones of the joint together.

• Tendons are tissues that join a muscle with a bone.

Questions:

1. Which statement best describes the below picture?

a. Biceps contracts and pulls the lower arm up

b. Triceps contracts and pulls the lower arm up

c. None of the above

2. Muscles that work in pairs against each other are called ……………

a. tendons

b. ligaments

c. antagonistic muscles

3. When triceps contracts and pulls the lower arm are down, what happens to the

biceps?

a. Biceps will relax

b. Biceps will contract

c. All the above

Chapter 5: Solids, liquids, and gases

Lesson 5.1 Classifying everyday materials

States of matter Solids

Liquids Gases

Fixed shape No fixed shape No fixed shape

Can’t be compressed Difficult to compress Easily compressed

Can’t flow Can flow Spread out to fill its container

Questions:

1. Which state of matter has a fixed shape?

a. Solid

b. Liquid

c. Gas

2. Orange juice is an example of a ………………. .

a. solid

b. liquid

c. gas

3. Which of the following characteristics best describe substances in the liquid

state?

a. are easily compressed, no fixed shape, can flow

b. are difficult to compress, no fixed shape, can flow

c. are difficult to compress, no fixed shape, can not flow

Lesson 5.2: Gases

• Gases are all around us, example: oxygen, carbon

dioxide, nitrogen, hydrogen, etc.

• Gases are made up of particles.

• Particles in gases are free to move in any direction.

Particles are pressed closer together Particles upon heating gain energy

Has smaller volume Particles move more quickly

Has greater volume

Questions:

1. Carbon dioxide is an example of a ……………. .

1. solid

2. liquid

3. gas

Squashing gas Heating gas

2. Upon squashing or compressing a gas its particles become closer together.

What will happen to its volume?

a. Becomes smaller

b. Becomes greater

c. Does not change

Lesson 5.3: Liquids

• The particles in a liquid:

✓ are arranged randomly

✓ have no fixed pattern

✓ have a very little space between them

✓ can slip and slide over and around each other

• Liquids are very difficult to be compressed because particles are touching

neighboring particles.

• Liquids can flow because particles are free to move around.

Heating Liquid

Particles gain energy

Particles move more quickly

Volume of the liquid expands

Has a greater volume

Questions:

1. Why does the volume of a liquid become larger upon heating?

a. Particles are pressed closer together

b. Particles move more quickly

c. None of the above

2. Liquids can flow because ………………. .

a. particles are free to move

b. particles can not move

c. have no particles

Lesson 5.4 Solids

• Particles in solids:

✓ are arranged in a regular pattern

✓ are fixed in their position

✓ cannot move around

✓ can vibrate

• Upon heating a solid, its particles gain energy and vibrate.

Questions:

1. Gold is an example of a solid matter.

What happens to the particles of gold upon heating it?

a. Particles slip and slide over

b. Particles vibrate

c. Particles move quickly

2. Particles in the figure represent the particles in a ………..

a. solid

b. liquid

c. gas

Fruitful Work