1. Bioenergetics - Photosynthesis

Question 1

What happens during photosynthesis?

Answer 1

During photosynthesis, ENERGY from SUNLIGHT is CONVERTED to chemical ENERGY in the form of glucose molecules

                                   light carbon dioxide + water = glucose + oxygen

Question 2

The energy needed for photosynthesis is supplied by:

Answer 2

The energy needed for photosynthesis is supplied by SUNLIGHT

Question 3

What is the green pigment essential for photosynthesis?

Answer 3

The green pigment essential for photosynthesis is … CHLOROPHYLL found in CHOLOPLATS

Question 4

Plants need nitrates to produce proteins. Where do plants obtain nitrates from?

Answer 4

Where do plants get NITRATES from … SOIL

Question 5

Pond weed experiment - how can you make it a fair test?

Answer 5

Pond weed fair test

1. use the same type of pondweed
2. the lamp should be the same distance apart

Question 6

Pond weed experiment - how can you make it a fair test?

Answer 6

Pond weed fair test

1. use the same type of pondweed
2. the lamp should be the same distance apart

Question 7

What type of reaction is photosynthesis?

Answer 7

Photosynthesis is an ENDOTHERMIC reaction because:

It TAKES IN ENERGY from SUNLIGHT

Question 8

What part of the plant does photosynthesis take place?

Answer 8

Photosynthesis takes place in the LEAVES

LEAVES contain the chemical CHLOROPHYLL.

CHLOROPHYLL can absorb LIGHT ENERGY

Question 9

Where do plants obtain the carbon dioxide used in photosynthesis?

Answer 9

Plants obtain the carbon dioxide used in photosynthesis from the AIR

Question 10

Name factors that may limit the rate of photosynthesis.

Answer 10

Factors that may limit the rate of photosynthesis:

. LIGHT AVAILBILITY

. Carbon dioxide concentration

. TEMPERATURE

. CHLOROPHYLL concentration

Question 11

To produced proteins from glucose, plants also use ……. which are absorbed from the soil

Answer 11

NITRATE IONS are needed to make proteins

Question 12

Pond weed experiment how can you improve the task?

Answer 12

The pond weed experience can be improved be:

. take at least TWO READING at each distance from the lamp and calculate the MEAN of the NUMBER OF BUBBLES

.

Question 13

Pond weed experiment - what is the dependent variable?

Answer 13

The pond weed experiment - the dependent variable is:

the number of BUBBLES in ONE MINUTE

Question 14

What type of reaction is Photosynthesis?

Answer 14

Photosynthesis is an ENDOTHERMIC reaction (TAKES HEAT IN)

Question 15

Heat is one of the factors that affects Photosynthesis

Answer 15

HEAT

As the temperature INCREASES so does the RATE of PHOTOSYNTHESIS - because more ENERGY is produced

After 45 degrees the rate of photosynthesis drops to ZERO because the ENZYMES have been DESTROYED

Question 16

CARBON DIOXIDE CONCENTRATION is another factor that affect the rate of PHOTOSYNTHESIS

Answer 16

As the CONCENTRATION of carbon dioxide INCREASES so does the RATE OF PHOTOSYNTHESIS

The rate of Photosynthesis then levels off as the concentration of carbon dioxide is no longer a limiting factor

Question 17

LIGHT and PHOTOSYNTHESIS. What happens as the light intensity increases?

Answer 17

As the LIGHT INTENSITY INCREASES so does the rate of photosynthesis.

After a certain point any increase has no further effect - the graph levels off.

When the reaction is stopped from going any further it is called the LIMITING FACTOR

Question 18

Light as a limiting factor during photosynthesis. Where is this on the graph?

Answer 18

Light is a limiting factor on a graph where there is a gradient. When the graph levels off, light is not a limiting factor.