Photosynthesis

Question 1

What is the word equation for Photosynthesis?

Answer 1

Carbon dioxide + water
-
Glucose + oxygen

Question 2

What is the balanced symbol equation for photosynthesis?

Answer 2

6C02 + 6H2O
-
C6H12O6 + 6O2

Question 3

Where does photosynthesis take place?

Answer 3

Chloroplasts

Question 4

Which pigment is required for photosynthesis?

Answer 4

Chlorophyll

Question 5

What does photosynthesis use to convert carbon dioxide and water into glucose and oxygen?

Answer 5

Light

Question 6

What does an endothermic reaction require?

Answer 6

Energy from it’s surroundings

Question 7

How does the CO2 enter the leaves?

Answer 7

diffusion from the stomata

Question 8

What is the journey of the water into the chloroplasts?

Answer 8

-Water is taken up from the soil by the roots
-Transported to the leaves via the xylem

Question 9

Name the product of photosynthesis that plants can use for aerobic respiration?

Answer 9

oxygen

Question 10

Name the five things glucose is used for?

Answer 10

-Cellular respiration
-Glucose molecules can combine to make cellulose
-Glucose molecules can combine to make starch
-Combining glucose molecules with nitrate ions to make amino acids
-Making oils and fats

Question 11

What is cellulose used for?

Answer 11

To strengthen the cell walls of plants

Question 12

What features make starch a good storage molecule?

Answer 12

-It’s more compact, so you can fit a lot more of it in a cell
-It’s insoluble, so it won’t draw water in through osmosis

Question 13

When is starch used by the plant?

Answer 13

When photosynthesis isn’t happening as much, during the night or winter, as it can be broken down into glucose

Question 14

What is combined with glucose to make amino acids?

Answer 14

Nitrate ions

Question 15

What are oils and fats used for?

Answer 15

Can be stored as a future energy source

Question 16

What affects the rate of photosynthesis?

Answer 16

-Light intensity
-Temperature
-Carbon dioxide concentration
-Amount of chlorophyll a plant has

Question 17

What causses reduced levels of chlorophyll?

Answer 17

-Disease
-Environmental stress
-Lack of nutrients

Question 18

What is the relationship between light intensity and rate of photosynthesis?

Answer 18

As light intensity increases so does the rate of photosynthesis, it then plateaus because another factor limits photosynthesis

Question 19

Is the relationship between CO2 concentration and rate of photosynthesis similar to that of light intensity?

Answer 19

Yes

Question 20

Why does the rate of reaction drop in temperature?

Answer 20

Enzymes start to denature

Question 21

What are the holes in the bottom of the leaf called?

Question 22

What are the holes in the bottom of the leaf called?

Answer 22

Stomata

Question 23

Where does most of the photosynthesis occur?

Answer 23

Palisade mesophyll cells

Question 24

What organelle do palisade cells have lots of?

Answer 24

Chloroplasts

Question 25

Which part of the plant carries the sugars made in photosynthesis to the rest of the plant?

Answer 25

Phloem

Question 26

What two adaptations do plants have for reducing water loss?

Answer 26

-Waxy cuticle -keeping stomata opening for as short a time as possible

Question 27

What do plants have to balance?

Answer 27

Maximize CO2 absorption and minimize water loss

Question 28

When does the Stomata open?

Answer 28

When the guard cells are turgid

Question 29

When do guard cells close and why?

Answer 29

At night, because there is no photosynthesis

Question 30

Why are the stomata on the underside of leaves?

Answer 30

Due to it being more shaded, so it is cooler, meaning less water will evaporate