B6

Question 1

name the list in order of organisms in the food chain

Answer 1

1) produce

2) primary consumer

3) secondary producer

4) tertiary producer

5) quaternary consumer

Question 2

word equation for photosynthesis?

Answer 2

carbon dioxide + water —-light & chlorophyll——-> glucose + oxegen

Question 3

uses for glucose in plants?

Answer 3

glucose:

• used for energy in respiration
• provides energy to turn sugars and nitrates into amino acid proteins
• used to make cellulose (main thing used in the structure of the cell wall)

Question 4

what are the sugars in photosynthesis used to make?

Answer 4

• sucrose
• starch
• lipids
• cellulose

Question 5

what test can we do to prove photosynthesis occurs in a leaf?

Answer 5

the starch test :

• boil a small part of a leaf in water for a few minutes
• then add the leaf to boiling alcohol to get rid of the chlorophyll that turns the alcohol green.
• rinse the leaves of alcohol
• add iodine solution to test for starch (if starch occurs photosynthesis is happening)

Question 6

what can farmers do to increase the yield of their crop?

Answer 6

give the plants more:
- light
- water
- increased CO2

Question 7

why is CO2 a limiting factor in photosynthesis?

Answer 7

1)this is because the plant gets to a certain stage where its enzymes are fully saturated

2) with less CO2 photosynthesis is limited

Question 8

is photosynthesis and exo or endothermic reaction?

Answer 8

its endothermic
it uses the light from the sun (takes in the energy) to react CO2 and water to make oxegen and glucose

Question 9

what is translocation?

Answer 9

translocation is the sharing of sugars round the plant

(because photosynthesis occurs in leaves, the sugars that are made have to be transported round the plant to be used as energy)

Question 10

what are the phloem vessels?

Answer 10

the phloem vessels are what is used to transport ‘cell sap’ round the plant (a combination of sugar and water)

the vessels also have small holes to only let things the right size through.

Question 11

what are the xylem tubes?

Answer 11

• made of dead xylem vessels and supported by lignin
• role: to transport water and mineral ions from the roots to the leaves so the water can be used in photosynthesis

Question 12

explain the role the stomata has in evaporation of water molecules?

Answer 12

• all the water molecules that flow from the xylem vessel to the leaves are like a chain and this is known as the ‘transpiration stream’.
• this means when water is evaporated from the stomata the stream is pulled onto the next few molecules and so on.
• the stomata must always stay open to let CO2 in

Question 13

the rate of transpiration depends on what 2 factors?

Answer 13

• light intensity - the more light the more open the stomata is meaning increased evaporation
• tempreture - the higher the temp the more energy the water molecules have

both of these factors increase transpiration

Question 14

how do auxins work ?

Answer 14

• auxins control growth and are found in the tips of roots and shoots
• in the sun the auxins move to the shaded side of the plant meaning they only grow 1 side of the plant cells which is why plants bend towards the sun

Question 15

the roots are what tropic?

Answer 15

negatively phototropic (because they grow away from light)
and positively gravitropic because they grow down with gravity.