2.2 and 2.3

Question 1

Tissue

Answer 1

a group of cells with similar
structures, working together to perform a
shared function.

Question 2

Organ

Answer 2

a structure made up of a group
of tissues, working together to perform specific
functions.

Question 3

Organ system

Answer 3

a group of organs with
related functions, working together to perform
body functions

Question 4

Organ system examples

animal

Answer 4

circulatory system 
respiratory system 
nervous system 
muscular system 
skeletal system

Question 5

Organ examples

animal

Answer 5

Heart 
Stomach 
Lungs 
Brain 
Liver

Question 6

Tissue examples

animal

Answer 6

cardiac muscle tissue 
glandular tissue 
pleural tissue 
epithelial tissue
fibrous tissue

Question 7

Specialised cells

Answer 7

They do one particular job
They develop a distinct shape
Special kinds of chemical change takes place in their cytoplasm

Question 8

Ciliated cells

special feature

Answer 8

Tiny hairs known as cilia that move mucus

Question 9

Ciliated cells function

Answer 9

Move mucus and bacteria away from the lungs

Question 10

Sperm cells special feature

Answer 10

Tail to enable sperm to swim.

Question 11

Sperm cells function

Answer 11

Reproduction, achieved by penetrating an egg cell.

Question 12

Red blood cells special feature

Answer 12

no nucleus

contains haemoglobin

Question 13

Red blood cells function

Answer 13

transports oxygen around the body.

Question 14

Egg cells special feature

Answer 14

• large amounts of cytoplasm containing yolk droplets.
• these yolk droplets are make of protein and fat.
• nucleus carries the genetic information

Question 15

Egg cell function

Answer 15

reproduction

Question 16

Nerve cells special feature

Answer 16

• often very long
• has the ability to conduct electrical impulses
• some have fatty sheath present for insulation.

Question 17

Nerve cells function

Answer 17

carries electrical impulses to and from the brain and spinal cord.

Question 18

Root hair cells special feature

Answer 18

hair gives a large surface area for absorption

Question 19

Root hair cells function

Answer 19

absorbs water and mineral ions

anchors the plant firmly in the soil

Question 20

Xylem cells special feature

Answer 20

arranged to form vessels 
lack cell walls
lack cytoplasm 
lack cell nucleus 
the walls become lignified for strength and to make the vessels waterproof.

Question 21

Xylem cells function

Answer 21

Transports water and mineral ions from roots to leaves.

Question 22

Palisade mesophyll cells special feature

Answer 22

column shaped

packed with chloroplasts

Question 23

Palisade mesophyll cells function

Answer 23

trap sunlight to make food by photosynthesis.

Question 24

Organ system

plants

Answer 24

root system
shoot system
flower

Question 25

Organs

plants

Answer 25

leaves
stem
roots
stamen

Question 26

Tissue

plants

Answer 26

epidermis
vascular tissue
xylem tissue
phloem tissue

Question 27

Magnification

Answer 27

actual size

Question 28

Actual Size

Answer 28

magnification

Question 29

The observed size and the actual size must have the

Answer 29

same units.