5 LEAVES + PHOTOSYNTHESIS

Question 1

What part of the plant cell carries out photosynthesis

Answer 1

Chlorophyll

Question 2

Photosynthesis word equation

Answer 2

Carbon Dioxide –> (sunlight)(chlorophyll) –> Glucose + Oxygen

Question 3

Photosynthesis balanced symbol equation

Answer 3

6CO2 + 6H20 –>(chlorophyll)(sunlight)–> C6H12O6 + 6O2

Question 4

What energy transfer takes place during photosynthesis

Answer 4

Light energy to chemical energy (in the form of ATP)

Question 5

What is the limiting factor in photosynthesis

Answer 5

The factor with the shortest supply

Question 6

How does increasing the concentration of carbon dioxide increase the rate of photosynthesis

Answer 6

There are more reacting molecules to collidw with enzymes

Question 7

How does increasing light intensity incresae the rate of photosynthesis

Answer 7

There is more energy for the reaction to occur

Question 8

Why do on photosyntesis graphs, do the factors level off

Answer 8

Another factor becomes limiting

Question 9

Why do on photosyntesis graphs, do the factors level off

Answer 9

Another factor becomes limiting

Question 10

How does increasing temperature increase the rate of photosynthesis

Answer 10

• Rate of reaction is increased
• Enzymes and substrates have more kinetic energy and collide more often
• At too high temperatures, the enzymes denature and rate decreases

Question 11

When investigating photosynthesis using iodine, why must you keep the leaf in the dark for 24 hours

Answer 11

So it is free from starch at the start of the experiment (any starch you test was produced by glucose made in photosynthesis during the experiment)

Question 12

Top surface of leaf

Answer 12

Waxy cuticle

Question 13

Below waxy cuticle of leaf

Answer 13

Upper epidermis

Question 14

Below upper epidermis of leaf

Answer 14

Palisade mesophyll layer

Question 15

Below palisade mesophyll layer of leaf

Answer 15

Spongy mesophyll layer with vasuclar bundle

Question 16

Bottom of leaf

Answer 16

Lower epidermis with gaurd cells and stoma

Question 17

How are leafs adapted for photosynthesis

Answer 17

• Large surface area and thin to maximise abosrption of sunlight and number of stomata
• Upper epidermis is transparent allowing light to penetrate to mesophyll
• Palisade cells are long, thin and tightly packed
• Palisade cells contain lots of chloroplasts
• Stomata allow gases to diffuse into air spaces of the leaf (short distance)
• Xylem transports water into leaves (short distance)

Question 18

Plant’s use of nitrates

Answer 18

Make amino acids and DNA

Question 19

Plant’s use of nitrates

Answer 19

Make amino acids and DNA

Question 20

Plant’s use of magnesium ions

Answer 20

Make chlorophyll

Question 21

Symptoms if plant becomes deficent in nitrates

Answer 21

Stunted growth

Question 22

Symptoms if plant becomes deficent in nitrates

Answer 22

Stunted growth

Question 23

Symptoms is plants become deficent in magnesium ions

Answer 23

Yellow leaves

Question 24

How do carbon dioxide and oxygen enter and leaf the leaf

Answer 24

Through the stomata

Question 25

How are leaf's specialised for gas exchange

Answer 25

* Thin and large surface area so diffusion distance is short and there are more stomata * Stomata allow gas to diffuse in and out of air spaces of the leaf (short distance for mesophyll cells) * Gaurd cells by stomata can change shape, altering the size of the stomata * The stomata close to reduce water loss

Question 26

In terms of respiration and photosynthesis, what is happening when more carbon dioxide is being released by a leaf than oxygen

Answer 26

Respiration is occuring faster than photosynthesis

Question 27

In terms of respiration and photosynthesis, what is happening when more oxygen is being released by a leaf than carbon dioxide

Answer 27

Photosynthesis is occuring faster than repspiration

Question 28

When investigating photosynthesis using iodine, why must you keep the leaf in the dark for 24 hours

Answer 28

So it is free from starch at the state of the experiment (any starch you test was produced by glucose made in photosynthesis during the experiment)