B8 - Photosynthesis - Complete

Question 1

Why type of reaction is photosynthesis?

Answer 1

Endothermic, as it takes in energy from its surroundings in order to be performed

Question 2

Where does photosynthesis take place predominantly in plants?

Answer 2

The leaves

Question 3

What substance does chloroplasts contain?

Answer 3

Chlorophyll

Question 4

What is the chemical formula for glucose?

Answer 4

C6 H12 O6

Question 5

What is the word equation of photosynthesis?

Answer 5

Carbon dioxide + Water —-> Oxygen + Glucose

Question 6

How does photosynthesis take in energy?

Answer 6

Through absorbing the light energy around it

Question 7

What happens to the glucose produced during photosynthesis?

Answer 7

Some of it is converted back into energy straight away through the use of respiration, however most of it is stored as insoluble starch

Question 8

Give 3 ways leaves are well adapted to performing photosynthesis

Answer 8

They are thin so the diffusion distances for gases are short, most of them are broad so they can absorb sunlight easily, they contain chlorophyll in the chloroplasts to absorb light, they have veins so water can easily get into them, they have air spaces so CO2 and Oxygen can easily come and go

Question 9

What are 3 things plants need to grow?

Answer 9

Warmth, light and Carbon Dioxide

Question 10

What is a limiting factor?

Answer 10

Something that prohibits an increase in rate of reaction from being optimal if it is in short supply

Question 11

Why is light a limiting factor?

Answer 11

As a plant needs it to get the energy to power photosynthesis - since it is a endothermic reaction

Question 12

Why is temperature a limiting factor?

Answer 12

Temperature affects all chemical reactions - including photosynthesis. It provides energy and so often raises the rate of reaction if it is in high supply. However, since photosynthesis is controlled by enzymes above 40 - 50 C they will denature and the effect would become negative

Question 13

Why is carbon dioxide a limiting factor?

Answer 13

CO2 is a limiting factor as it is needed to carry out the process of photosynthesis

Question 14

What problems in relation to photosynthesis could a lack of magnesium cause in a plant and why?

Answer 14

As it would be unable to make too much chlorophyll and therefore unable to fully photosynthesise - which may eventually lead to the plant’s death

Question 15

What is the reverse of photosynthesis chemically?

Answer 15

Respiration

Question 16

Why complex carbohydrate can be made from glucose to enforce a plant’s cell walls?

Answer 16

Cellulose

Question 17

Why does a plant have convert glucose to starch when it stores it within the cells?

Answer 17

As glucose is insoluble and would therefore effect how water moves throughout the plant and its cells, if this happened on a large scale it could disrupt the plant’s water distribution and how it works on a largely negative scale

Question 18

Where can starch be found?

Answer 18

In leaf cells for when light levels are low or it is dark, and in tubers and bulbs that have lots of it in order to make sure that they survive through the winter

Question 19

What, other than starch, can glucose be used to make?

Answer 19

Amino acids for use in proteins such as enzymes

Question 20

Where in a plant are you most likely to find fats and oils in a high concentration?

Answer 20

Within its seeds - as they are made so they new plant has food to grow

Question 21

Why do greenhouses make plants grow faster and better?

Answer 21

As they keep the atmosphere warm which is good for the plants and protects those that easily prone to specific diseases or that struggle to survive outside

Question 22

What is hydroponics?

Answer 22

When plants are grown in specifically made nutrient - rich water mixture that is perfect for plants growth in order to make sure that its growth rate is maximal

Question 23

Name 2 economic positives of greenhouses

Answer 23

The ground doesn’t have to ploughed and doesn’t have to be very good. Less staff needs to hired, turnover is quick and therefore profits are high: less work for more product. The final crop is much larger and cleaner.

Question 24

Name 2 economic negatives of greenhouses

Answer 24

The monitoring system is expensive, and if it malfunctions and no-one notices then it would cause a colossal problem. A lot of planning has to go into making sure the conditions are just perfect.