Topic E - Photosynthesis

Question 1

Equation for photosynthesis

Answer 1

Carbon dioxide + water ——-> Glucose + oxygen

Question 2

Chemical equation of glucose

Answer 2

Glucose = C6 H12 O6

Question 3

What is photosynthesis

Answer 3

Process which green plants use sunlight energy to make food

Question 4

What does Photo + synthesis mean

Answer 4

Light + Make

Question 5

What does photosynthesis use

Answer 5

Inorganic substances to make Organic substances

Question 6

What are green plants called

Answer 6

Producers

Question 7

What green pigment do plants contain

Answer 7

Chlorophyll

Question 8

Where is chlorophyll found

Answer 8

In chloroplasts

Question 9

What does chlorophyll do

Answer 9

Absorbs light energy

Question 10

How does water enter plants

Answer 10

Through the roots

Question 11

How does carbon dioxide enter plants

Answer 11

Through stomata in the leaves

Question 12

Large surface area

Answer 12

To absorb more light

Question 13

Name of veins

Answer 13

Phloem + Xylem

Question 14

Function of stomata

Answer 14

Open and close to control water loss

Gas exchange

Question 15

Function of spongy mesophyll cells

Answer 15

Air spaces between them so essential carbon dioxide and waste oxygen can get in and out- DIFFUSION

Question 16

What travels in the xylem and in what direction does it go

Answer 16

Water from root hair cells

Travels up the stem to leaves

Question 17

What travels in the phloem and where is it transported to

Answer 17

Sugars produced in the leaves

Transported to all parts of plant

Question 18

Function of cuticle

Answer 18

covered in wax
waterproof
stops water escaping through epidermis

Question 19

Why are palisade cells long and closely-packed ( relate to photosynthesis

Answer 19

Long- contain lots of chlorophyll

Closely-packed - more they are faster will carry out photosynthesis

Question 20

Why are the epidermis and cuticle transparent

Answer 20

To allow light to reach the palisade cells

Question 21

Which types of cells in a leaf contain chloroplasts

Answer 21

Palisade layer

Question 22

What are the 6 uses of sugar( glucose) in a leaf

Answer 22

1. Energy ( used instantly)
2. Starch (insoluble)
3. Cellulose cell wall
4. Lipids( in seeds)
5. Sucrose (nectar
6. Amino acids (growth)

Question 23

What are 3 factors that effect the rate of photosynthesis

Answer 23

Light intensity
Amount of Carbon dioxide
Temperature

Question 24

Explain rate of photosynthesis and light intensity

Answer 24

Brighter the light the faster the rate of photosynthesis

Question 25

Explain rate of photosynthesis and carbon dioxide

Answer 25

constant level in air = 0.03%

if decreases below 0.03% rate is slower

Question 26

Explain rate of photosynthesis and temperature

Answer 26

photosynthesis controlled by enzyme

low temp.= slow rate reaction
optimum temp.= 40’c (plants at 22-23’c)
high temp= denatures enzymes

Question 27

what happens if one of the 3 factors ( rate ) is short in supply

Answer 27

will limit the rate of photosynthesis no matter how much of the others is available