Photosynthesis & Respiration

Question 1

What is photosynthesis?

Answer 1

It is the chemical process in which the way plants make their own food, using sunlight.

Question 2

Write out the chemical equation for photosynthesis

Answer 2

Sunlight
6CO2 + 6H20 → 6C6H12O6 + 6O2
Chlorophyll

Question 3

Describe the process of photosynthesis

Answer 3

The chlorophyll in chloroplasts absorb light from the sun, creating energy.
Glucose is made using this energy, from the carbon dioxide, that enters through the stomata, and water (absorbed from the soil in the xylem vessel).

Question 4

List 6 adaptations of the leaf for photosynthesis

Answer 4

~Very thin- cells are never far away from light

~Very broad- leaves have lots of space to trap the most amount of sunlight

~Cells containing the most chloroplasts are found in the upper layers of the leaf

~Air spaces- allow carbon dioxide to move quickly onto the cell and oxygen to quickly leave the cell

~Veins- the veins in the leaves bring water from the soil into the leaf and carry food away to all the other parts of the plant

~Stomata

Question 5

What are stomata?

Answer 5

tiny pores in the leaf that allow carbon dioxide to enter the leaf and allow oxygen and water vapour to exit the leaf

Question 6

What factors affect photosynthesis?

Answer 6

• water
• carbon dioxide
• light
• chlorophyll

Question 7

Explain (using a diagram) an experiment that shows how something affects photosynthesis

Answer 7

the experiment investigating the influence of light intensity on the rate of photosynthesis

Question 8

What is respiration?

Answer 8

the release of energy from food

Question 9

What is the chemical equation for respiration?

Answer 9

C6H12O6 + 6O2 → Energy + 6CO2 + 6H2O.

Question 10

Where does aerobic respiration occur?

Answer 10

In the mitochondrion

Question 11

What are the waste products of aerobic respiration?

Answer 11

water and carbon dioxide

Question 12

Describe the process of aerobic respiration

Answer 12

Glucose combines with oxygen, causing a release of energy.

Question 13

What are the waste products of anaerobic respiration?

Answer 13

lactic acid

Question 14

What are the waste products of anaerobic respiration in yeast?

Answer 14

alcohol and carbon dioxide

Question 15

Describe the process of anaerobic respiration

Answer 15

When we exercise, the rate of respiration increases because we need more energy.
However, our breathing rate can’t keep up with the demand for oxygen.
This causes anaerobic respiration to occur, in addition to aerobic respiration.

Question 16

What are the functions of roots?

Answer 16

• anchors and supports the plant in the soil
• • absorbs water and minerals from the soil

Question 17

What are the functions of the stem?

Answer 17

• supports and holds up the leaves and flowers
• transports water and minerals from the roots to the leaves
• transports food from the leaves to the rest of the plant
• some store food

Question 18

What are the functions of the bud?

Answer 18

• potential growth point
• • new leaves or flowers may develop here

Question 19

What are the functions of the flower?

Answer 19

• produce seeds so that the plant can reproduce
• attracts insects
• provide nectar

Question 20

What are the functions of the leaf?

Answer 20

• make food and oxygen (photosynthesis)
• allows gases and water vapour to pass in and out

Question 21

What are xylem and phloem tissue?

Answer 21

xylem- transports water
phloem- transports food

Question 22

What is the word equation for Photosynthesis?

Answer 22

Chlorophyll
Carbon dioxide + water -> Glucose + Oxygen
Sunlight

Question 23

What is the word equation for Respiration?

Answer 23

Glucose + Oxygen -> Energy + Carbon Dioxide + Water