• Multicellular organisms, like animals, are made up of differentiated cells.
• Tissues are aggregations of cells.
• Organs are made up of tissues.
• Organ systems are made up of organs which together carry out a specific function.
• The digestive system is composed of glands, the stomach, the small intestine and the liver.
• Plants are also made up of tissues.
• The three main organs found in plants are roots, shoots and leaves.
• Leaves are adapted for photosynthesis.

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Tissues, Organs and Organ Systems – TEST IT!

1. Multicellular organisms are composed of a large number of cells.

a) Complete the following sentences:

i. Tissues are composed of groups of _____________

ii. Organs are composed of _____________

iii. Organ systems are composed of _____________

b) Complete the table below by giving an example for each body part.

Organ system

1. Plants are composed of different cells, each with a specific function.

a) Join up each leaf feature with its function.

waxy cuticle allows carbon dioxide to enter the leaf

stoma protects the leaf

upper epidermis contains a lot of space so that carbon dioxide can easily move through

spongy mesophyll thin so that light can move through easily

b) Name two other features of green plants that make them so efficient at carrying out photosynthesis.

i. ________________________________________________________

ii. ________________________________________________________

1. Humans and animals have a digestive system for breaking down food.

a) Name two glands that produce digestive juices.

i. ______________________________________

ii. ______________________________________

b) Where is bile produced?

c) What is bile important for?

d) What organ absorbs the soluble food? Choose one from below:

i. large intestine

ii. small intestine

iii. liver

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ANSWERS

a)

i. …cells

ii. …tissues

iii. …organs

b)

Organ systemMuscular/Glandular/EpithelialStomach/Heart/Lungs/Liver etc.

Digestive/Cardiovascular

a) waxy cuticle ? protects the leaf

stoma ? allows carbon dioxide to enter the leaf

upper epidermis ? thin so that light can move through easily

spongy mesophyll ? contains a lot of space so that carbon dioxide can easily move through

b) Possible answers:

• The leaves contain a lot of chloroplasts.
• Guard cells control the size of the stoma.
• The stoma are mainly located on the bottom half of the leaf.

a)

i. Salivary glands

ii. The pancreas

b) The liver

c) Bile digests fats.

d) ii. small intestine