Photosynthesis

Question 1

TO make foods, what do plants have to take in?

Answer 1

carbon dioxide and water

Question 2

How does carbon dioxide enter the plant?

Answer 2

it diffuses through the stomata

Question 3

How does water enter the plant?

Answer 3

it enters the roots from the soil through the root hair cells by osmosis

Question 4

What do carbon dioxide and water react together to make?

Answer 4

glucose and water

Question 5

What is the word equation for photosynthesis?

Answer 5

carbon dioxide + water —> glucose + oxygen

Question 6

What is the balanced symbol equation for photosynthesis?

Answer 6

6CO2 + 6H2O → C6H12O6 + 6O2 + 6H2O

Question 7

Where inside the plant does photosynthesis occur?

Answer 7

inside the plat’s chloroplasts

Question 8

Why are the leaves and stems of a plant green?

Answer 8

because they contain chlorophyll

Question 9

Is photosynthesis and exothermic or an endothermic reaction?

Answer 9

endothermic

Question 10

What happens to the glucose produced in photosynthesis?

Answer 10

used in respiration, converted to fructose or sucrose and unnecessary glucose is converted to starch which provides a store of energy for night time when the plant is not photosynthesizing.

Question 11

How can you show that light, chlorophyll and carbon dioxide are essential for photosynthesis?

Answer 11

By testing a leaf for the presence of starch

Question 12

How do you test a leaf for starch?

Answer 12

you take the leaf you’re about to test and place it in a beaker of boiling water for a minute to kill it. Then, using forceps, place the leaf in a boiling tube of boiling ethanol to remove all of the chlorophyll. Then wash the leaf with water to remove the ethanol and soften the leaf and spread it out on a white tile. Add a few drops of iodine solution on the leaf. If starch is present, the iodine will turn from yellow-brown to blue-black.

Question 13

What are variegated leaves?

Answer 13

leaves that only have chlorophyll in some areas of the leaf

Question 14

How can you prove light is needed for photosynthesis?

Answer 14

take a destarched plant and cover part of one of its leaves with black card or tin foil. Then place the plant in sunlight for several hours and finally remove the card from the leaf and test the leaf for the presence of starch.

Question 15

What are the factors which affect the rate of photosynthesis?

Answer 15

light intensity, carbon dioxide and temperature