BIG TEST 1

Question 1

What are the characteristics of life/ how do we know if something is alive?

Answer 1

Movement 
Respiration 
Senses
Growth
Reproduction 
Excretion
Nutrition

Question 2

Label a plant and give functions

Answer 2

Roots- absorb water and minerals. Anchor the plant (keep it from falling over)
Leaf-makes food by photosynthesis
Stem-connects the plant structures to each other. Holds the plant up
Flower- reproduction

Question 3

Which parts of the plant are needed for growth?

Answer 3

Leaf- makes the food

Stem- sends the food to different parts of the plant

Roots- absorb water which is needed for photosynthesis

Question 4

What is biomass?

Answer 4

Biomass is the dry weight of a living thing

As a plant grows it increases in biomass

Question 5

What does a plant need to make food?

Answer 5

REACTANTS: sunlight, carbon dioxide, water

PRODUCT: glucose, oxygen

Question 6

Name two conditions that will encourage and limit growth

Answer 6

Encourage: water, light

Limit: too much/ not enough water, no light/ dim light,

Question 7

What is the word equation for photosynthesis?

Answer 7

carbon dioxide + water—–> glucose + oxygen

Question 8

Label and write the functions of an animal cell

Answer 8

Nucleus-
Cell membrane-
Cytoplasm-

Question 9

Label a plant cell and write the functions

Answer 9

Nucleus-
Cell membrane-
Cell wall-
Chloroplasts-
Vacuole-

Question 10

How is the palisade cell adapted for photosynthesis?

Answer 10

It had many chloroplasts

Question 11

Name 3 features a leaf has and explain why

Answer 11

Waxy layer- reduces water loss

Flat/broad- increases surface area so more light can reach the leaf

Green- contains chloroplasts which contain chlorophyll

Question 12

Label the structure of a leaf

Answer 12

Waxy top layer, upper epidermis, palisade layer, vein, spongy layer, air spaces, lower epidermis, guard cells, stomata

Question 13

Pick two features of a leaf and explain what their function is

Answer 13

Chlorophyll- to absorb light energy

Veins- to deliver water and remove glucose during photosynthesis

Question 14

What is transpiration

Answer 14

Transpiration is the flow of water through a plant

Question 15

How does water flow through a plant?

Answer 15

1) Water enters the roots by osmosis
2) water travels up the stem in xylem vessels
3) water vapour diffuses out from the stomata in the leaf and comes out as gas

Question 16

Why do plants need water?

Answer 16

For photosynthesis, opening and closing stomata, to form fruits