plant nutrition

Question 1

how do plants get energy?

Answer 1

all living things need biological molecules to make energy, plants can make some of these from inorganic substances.

Question 2

what is photosynthesis

Answer 2

the process by which plants synthesize carbohydrates from raw materials using energy from the light.

Question 3

equation: photosynthesis

Answer 3

carbon dioxide + water ——> glucose + oxygen
6CO2 + 6H20 —–> C6H12O6 + 6O2

Question 4

what is chlorophyll adapted to?

Answer 4

to capture energy from sunlight and transfer it to water molecules and carbon dioxide molecules
this energy makes the substance react, producing glucose.
(chlorophyll makes glucose)

Question 5

products of photosynthesis

Answer 5

• oxygen is released into the air
• glucose

Question 6

why do plants need glucose?

Answer 6

• provide energy for active transport
• for growth
• some is stored for later use (starch)
• to transport glucose it is chained together to make fructose and then broken down again
• making cellulose for building cell walls
• to make nectar (sweet liquid made from glucose)
• to create amino acids for proteins
• to create chlorophyll

Question 7

how do plants make amino acids?

Answer 7

they get nitrogen from soil in the form of Nitrate ions, these are taken in through the root hairs by active transport.

Question 8

what happens if there isn’t enough nitrate ions in the soil?

Answer 8

the plant won’t synthesize to make proteins and the plant can’t grow.

Question 9

what does chlorophyll contain?

Answer 9

Mg and N, if the plant doesn’t have enough Mg it cant’s make chlorophyll and the plant turns yellow.

Question 10

factors that affect photosynthesis

Answer 10

• supply of raw materials (CO2)
• quantity of sunlight
• the temp (affect quality of enzymes)
  (quantity of chlorophyll in the leaf

Question 11

what is destarching

Answer 11

leaving a plant in the dark until all its starch is used up

Question 12

method for destarching

Answer 12

1. put the plant in the dark for a few days
2. take plant out and cover a part of the leaf with black card
3. use ethanol to remove chlorophyll for the leaf
4. use iodine to test for starch

Question 13

hydrogencarbonate indicator

Answer 13

purple = no carbondioxide
red = little carbondioxide
yellow = lots of carbondioxide

Question 14

what is a limiting factor

Answer 14

a factor that is in short supply, which stops an activity happening at its faster rate

Question 15

limiting factors in photosynthesis

Answer 15

light intensity
carbon dioxide
temperature
stomata