Levels of organisation

Question 1

Tissue

Answer 1

A tissue is a group of cells with similar structures, working together to perform a shared function

Question 2

Organ

Answer 2

An organ is a group of tissues working together to perform specific functions

Question 3

Organ system

Answer 3

An organ system is a group of organs with related functions, working together to make the body go!

Question 4

How does the structure of a red blood cell enable it to perform it’s functions as well as it can?

(Red blood cells carry oxygen)

Answer 4

• No nucleus = more space for haemoglobin

- Very flexible = can squeeze through the narrowest of blood vessels

Question 5

How does the structure of a root hair cell enable it to perform it’s functions as well as it can?

(Root hair cells absorb minerals and water from soil)

Answer 5

• Long extenstion = increases the surface area for absorption

Question 6

How does the structure of a ciliated cell enable it to perform it’s functions as well as it can?

(Ciliated cells move mucus in the trachea and bronchi)

Answer 6

• Layers of tiny hairs = move and push mucus around

Question 7

How does the structure of a xylem vessel enable it to perform it’s functions as well as it can?

(Xylem vessels are used in conduction and support)

Answer 7

• No cytoplasm = the water can pass freely
• No end wall = many cells can form a continuous tube
• Walls strengthened with waterproof substance lignin

Question 8

How does the structure of a nerve cell enable it to perform it’s functions as well as it can?

(Nerve cells conduct nerve impulses)

Answer 8

• Fatty sheath = Gives electrical insulation

- Many-branched ending = can connect with many other cells

Question 9

How does the structure of a palisade mesophyll cell enable it to perform it’s functions as well as it can?

(Palisade mesophyll cell )

Answer 9

• Densely packed cells = Allows absorption of the maximum amount of light energy