Photosynthesis and Ecology

Question 1

What is the word equation for photosynthesis?

Answer 1

Carbon Dioxide + Water –> Oxygen + Glucose

Question 2

What is photosynthesis used for?

Answer 2

So the plant can create its own food from glucose

Question 3

What conditions are necessary for a plant to grow and do photosynthesis?

Answer 3

Co2 in the air
Constant watering

Question 4

What does a plant use to absorb light energy?

Answer 4

Chlorophyll

Question 5

What is the first step in the Testing for Starch practical?

Answer 5

Heat a plant leaf in boiling water for 30 seconds

Question 6

What does boiling the leaf in water do to the leaf?

Answer 6

This kills the leaf
Stops any chemical reactions
Kills the enzymes

Question 7

What liquid will you then boil the leaf in?

Answer 7

Ethanol

Question 8

What does boiling the leaf in ethanol do?

Answer 8

The boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf, it will turn white, breaks the outer protective cells of a leaf

Question 9

What will you do after you have boiled the leaf in ethanol?

Answer 9

Wash with water to rehydrate and soften the leaf and spread it onto a white tile

Question 10

What is the liquid used to test for starch?

Answer 10

Iodine Solution

Question 11

Once dropping iodine on the leaf what will happen?

Answer 11

After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.

Question 12

If the leaf is left in a dark room why would it be yellow after Iodine?

Answer 12

No photosynthesis can occur.
No starch

Question 13

What happened to the starch in the leaf?

Answer 13

Used all of the reserves of starch to make glucose

Question 14

What is the Independent Variable in the test on the affect of light intensity?

Answer 14

Light Intensity

Question 15

What is the Dependent Variable in the test on the affect of light intensity?

Answer 15

Amount of Bubbles released

Question 16

What are the Control Variables in the test on the affect of light intensity?

Answer 16

Pondweed, Length of Pondweed, temperature, CO2 levels

Question 17

How long will you time the pondweed for each time?

Answer 17

1 minute

Question 18

How many time could you repeat the light intensity experiment?

Answer 18

10 times

Question 19

What should the pattern be at the end of the experiment?

Answer 19

As the light intensity decreases the rate of photosynthesis will decrease.

Question 20

What must you let the pondweed do before beginning the experiment?

Answer 20

Allow pondweed to acclimatise to temperature.

Question 21

Give the definition of a population?

Answer 21

Number of individuals of a species in a habitat

Question 22

Give the definition of a community?

Answer 22

All the individuals of all the species in a habitat

Question 23

Give the definition of a ecosystem?

Answer 23

All non-living and living species in one habitat

Question 24

What is the definition of abiotic factors?

Answer 24

Non-living factors in the ecosystem

Question 25

Give examples of abiotic factors? (4 factors)

Answer 25

Moisture, temperature, wind, gases

Question 26

What is the definition of biotic factors?

Answer 26

Living factors in the ecosystem

Question 27

Give examples of biotic factors? (4 factors)

Answer 27

Predators, competition, prey, pathogens

Question 28

What are the 4 stages of a food web?

Answer 28

Producer, Primary consumer, Secondary Consumer, Tertiary consumer

Question 29

What do the arrows in a food chain mean?

Answer 29

Where energy is transferred

Question 30

Why are the food chains so short?

Answer 30

Because by the tertiary consumer most of the energy has been passed on already

Question 31

How is energy lost in animals? (4 ways)

Answer 31

Respiration Non digestible parts (Bones) Urine and Faeces Heat energy

Question 32

What does saprotroph mean?

Answer 32

Feed off the dead

Question 33

What are the primary consumers usually: Carnivore, Omnivore or Herbivore?

Answer 33

Herbivore

Question 34

What are the secondary consumers usually: Carnivore, Omnivore or Herbivore?

Answer 34

Carnivore

Question 35

What are the tertiary consumers usually: Carnivore, Omnivore or Herbivore?

Answer 35

Carnivore

Question 36

What are tertiary consumers usually known as?

Answer 36

Apex Predators

Question 37

What can you use to estimate the amount of flowers in a field?

Answer 37

A Quadrant

Question 38

What should you first do when getting to your field?

Answer 38

Measure out a x and y axis with measuring tape. It should be 10m by 10m

Question 39

What should be used and done to be able to place your quadrant in a random place?

Answer 39

Use a random number generator on a calculator. Use the last two digits.

Question 40

What should you do once having found your coordinates?

Answer 40

Place quadrant on given coordinate and count the amount of flowers (or species) you see.

Question 41

How many times should you repeat the quadrant experiment?

Answer 41

10 times

Question 42

When plotting a pyramid of biomass what must you do when plotting it?

Answer 42

Make sure each side is the same distance across (total distance halved) and make sure every rectangle is the same height.

Question 43

Why is a pyramid of biomass better than a pyramid of numbers?

Answer 43

Shows mass of living organisms representing the chemical energy

Question 44

What does CORMS stand for?

Answer 44

C- Change O - Organism R - Repetition M - Measure S - Same