Photosynthesis

Question 1

What do plants need to survive

Answer 1

Sunlight
Water
Food/nutrients
Carbon dioxide

Question 2

What part of the plant carries out photosynthesis

Answer 2

The leaf

Question 3

What does the flower do

Answer 3

It allows the plant to reproduce

Question 4

What do roots do

Answer 4

They absorb water and minerals from the soil

Question 5

What is photosynthesis

Answer 5

It is a chemical reaction that takes place in the chloroplasts in green plant cells, where light energy is used to convert carbon dioxide and water into glucose and oxygen.

Question 6

How do we know that plants require light for photosynthesis

Answer 6

Because the light energy is absorbed by chlorophyll which we know is necessary for photosynthesis to take place.

Question 7

True or false:

Some glucose is used straight away in respiration

Answer 7

True

Question 8

True or false:

Some glucose is converted into starch and other substances for storage.

Answer 8

True

Question 9

True or false:

Some glucose is used to make new chemicals such as proteins sugars and fats.

Answer 9

True

Question 10

What does putting a leaf in boiling water do

Answer 10

It de nature’s/kills the leaf

Question 11

How do plants obtain minerals

Answer 11

They absorb them from the soil.

Question 12

How do we know that plants store glucose as starch.

Answer 12

Because when plants are making sugar, they store it as starch and retrieve it when they need to be used

Question 13

What does boiling ethanol do to a plant

Answer 13

It dissolves the chlorophyll and makes it come out of the leaf.

Question 14

How are leaves adapted

Answer 14

They have a large surface area to capture lots of sunlight

They have stomata in the underside of the leaves which allow gasses in and out

Their veins carry water to the leaf and food from the leaf to the rest of the plant.

They have certain cells which contain chloroplasts which contain chlorophyll.

Question 15

What mineral elements do plants need

Answer 15

Some of the most important are:
Nitrogen
Phosphorus 
Potassium 
Magnesium

Question 16

How do plants obtain these minerals

Answer 16

From the soil. The minerals are found in salts dissolved in water which plants get from the soil.

Question 17

What is nitrogen used for

Answer 17

Making proteins

Question 18

What is phosphorus used for

Answer 18

Energy transfer/strong roots

Question 19

What is potassium used for

Answer 19

Drought tolerance/making fruit

Question 20

What is magnesium used for

Answer 20

Making chlorophyll

Question 21

Deficiency signs for nitrogen

Answer 21

Lower leaves are yellow upper leaves are pale green

Question 22

Deficiency signs for phosphorus

Answer 22

Purple leaves/small roots

Question 23

Deficiency signs for potassium

Answer 23

Yellow leaves/dead spots

Question 24

Deficiency signs for magnesium

Answer 24

Lower leaves are pale green/yellow.

Question 25

When are stomata most likely to open

Answer 25

During the day as there is more carbon dioxide around. Light also affects when they open and there is much more light during the day.

Question 26

Why are the leaves lower down in a forest larger that the ones high up

Answer 26

So they can absorb more sunlight as they are partly covered by the leaves that are higher up.

Question 27

What is mineral deficiency

Answer 27

It is when plants don’t grow as well because of a shortage of minerals/mineral.

Question 28

What are macroelements

Answer 28

They are elements that plants use in large quantities

Question 29

What are microelements

Answer 29

They are elements that plants use in small quantities

Question 30

What is an NPK fertiliser

Answer 30

It is one which contains Nitrogen, Phosphorus and potassium

Question 31

Why might farmers use fertilisers even though they already have healthy soil

Answer 31

To replace the minerals used by the crops.

Question 32

Why do some farmers use natural minerals?

Answer 32

Manure(contains natural minerals) releases the minerals over a long period of time.

Question 33

Why do some farmers use commercial fertilisers

Answer 33

Because they need something that will act quickly.

Question 34

List a few features that leaves have in common

Answer 34

They are thin, broad, flat, green and contain a pigment called chlorophyll.

Question 35

Why do leaves have these features

Answer 35

So the can photosynthesise efficiently.

Question 36

What are guard cells

Answer 36

They are cells in the stomata which affect when they open and close.

Question 37

What are palisade cells

Answer 37

They are cells that absorb light so that photosynthesis can take place.