B4

Question 1

What is meant by photosynthesis

Answer 1

Process of plant making sunlight using photosynthesis

Question 2

Where does photosynthesis take place

Answer 2

In the leaf where most cholopast is

Question 3

What kind of reaction is photosynthesis

Answer 3

Endothermic- takes in energy and stuff to make food

Question 4

Word equation for photosynthesis

Answer 4

Carbon dioxide + water –> glucose + oxygen

Question 5

Balanced symbol equation for photosynthesis

Answer 5

6CO² + 6H²O –> C6H12O6 + H²O

Question 6

Glucose is a product of photosynthesis. List 5 uses of glucose

Answer 6

• needed for respiration- occurs all the time
• stored as Insoluble starch- converted back into glucose when needed
• Some glucose make fats and oils
• cellulose - used in cell wall go support and strengthen cell
• glucose combine with nitrate ions to make amino acids which are used to make protiens

Question 7

What are the 4 factors that effect the rate of phtosynthesis

Answer 7

Light intensity, carbon dioxide concentration, tempurature, amount of cholophyll

Question 8

How does like intensity affect the rate of photosynthesis

Answer 8

When zero, photosynthesis rate is at zero. When increase, photosynthesis rate increase as the plant has more energy from the light to do photosynthesis. But there comes to a point where the maximum light intensity has been reached so photosynthesis rate increases no futher

Question 9

Carbon how does carbon dioxide concentration affect the rate of photosynthesis

Answer 9

When increase, photosynthesis rate increase. This tells us carbon dioxide is a limiting factor. At some point photosynthesis rate stops increasing so it is no longer a limiting factor

Question 10

How does tempurature affect the rate of photosynthesis

Answer 10

When increase, enzymes in reaction work faster so rate of photosynthesis increases. If temp keeps increasing, the enzymes active sight will change which will make the substrate and active site of the enzyme not complimentary anymore causing it to denatured. This will make photosynthesis rate fall

Question 11

How does amount of chlorophyll affect rate of photosynthesis

Answer 11

Cholorphyl Absorb sunlight for photosynthesis, the more there is the more photosynthesis can occur

Question 12

Limiting factors are important in economics of enhancing the conditions in the greenhouses to gain maximum rate of photosynthesis while still maintaining profit. Describe how this happens

Answer 12

Artificial light intensity allow photosynthesise to continue beyond daylight hour or higher than that

Question 13

What is inverse square law

Answer 13

Light intensity x 1/distance²
As distance doubles, light intensity goes down by a factor of 4

Question 14

What process do we get energy from

Answer 14

Respiration

Question 15

Give 3 reason why organisms need energy

Answer 15

Movement, keep warm, chemical reactions to build larger molecules eg: protiem made by chemically joining amino acids

Question 16

Where does respiration take place

Answer 16

In mitochondria of all living cells

Question 17

What is aerobic respiration? How much energy is transfered

Answer 17

When glucose and oxygen reacts to produce carbon dioxide and water. This also releases lots of energy. This requires lots of oxygen

Question 18

Word equation and symbol equation for aerobic respiration

Answer 18

Glucose + oxygen –> carbon dioxide + water
C6H12O6 + 6O² –> 6CO² + 6H²O

Question 19

What is anearobic respiration and how much energy is transfered

Answer 19

When there is a lack of oxygen,muscles respire anearobicly which produces less energy and produces lactic acid.

Question 20

Word equation for lactic acid

Answer 20

Glucose –> lactic acid + energy

Question 21

When time of respiration occur in yeast cells? What is word equation? What is process called?

Answer 21

Yeast cells respire anearobicly. This is called fermentation.
Glucose –> ethanol + carbon dioxide

Question 22

What is the economic importance of yeast cell respiration?

Answer 22

The ethanol produced can be used in alcohol and the char on dioxide produced can be used to help make bread rise

Question 23

When you exersie you respire more. What happens to heart rate when you respire?

Answer 23

Increases to pump more oxygenated blood around the body so more can reach muscle cells so we can respire more

Question 24

What happens to breathing rate and breathing volume when you respire? Why?

Answer 24

Breath more frequent and take deeper breaths so more oxygen can enter the body and at a faster rate. This is so more respiration can take place. During exersise, body needs great deal of energy for muscle contraction

Question 25

Why is a anearobic respiration not the best way to transfer energy from glucose?

Answer 25

This produces lactic acid that builds up in the muscles. It is poisoness so it causes pain and cramps. Also it does not produce alot of energy and causes muscle fatigue

Question 26

What is oxygen dept

Answer 26

. Sometimes not enough oxygen is suppliwd to the muscles
. Lactic acid builds up during exersise causing muscles to fatigue
. This cause muscles to stop contracting efficiently
. At this point, body must remove lactic acid causing oxygen dept
Lactic acid is transported out of the muscles Into the blood
. Then lactic acid is taken to liver and transported mack into glucose
. All this requires oxygen
Oxygen dept is the amount of excess oxygen the bogy needs after exersise to deal with accumulated lactic acid.
. This is when we breath rapidly after exersise

Question 27

What is metabolism

Answer 27

Sum of all the chemical reaction in a cell or in the body

Question 28

Give examples of metabolism reactions that take place in the body

Answer 28

. Glucose being stored as glycogen in the human body- storage form of glucose.
. To make lipids