Plants

Question 1

Phototropism

Answer 1

Positive
• grows towards the light for photosynthesis (shoots)

Negative:
• grows away from light to get deeper in the soil (roots)

Question 2

Geotropism

Answer 2

Positive:
• grows in direction of gravity for anchorage, maximum water and minerals (roots)

Negative:
• grows away from gravity to get maximum light (shoots)

Question 3

Hydrotropism

Answer 3

Positive:
• grows towards water for maximum photosynthesis (roots)

Shoots don’t respond to water

Question 4

Plant growth is controlled by

Answer 4

Auxins

Question 5

Word and chemical equation for photosynthesis

Answer 5

Word:
Carbon dioxide + water -> glucose + oxygen

Chemical:
6CO2 + 6H2O -> C6H12O6 + 6O2

Question 6

Limiting factor of photosynthesis

Answer 6

1. Light intensity
2. Carbon dioxide concentration
3. Temperature

Question 7

Five uses of glucose

Answer 7

1. Respiration
2. Stored as starch
3. Stored as lipid
4. Nitrates added to make protein
5. Cell wall

Question 8

Nitrates

Answer 8

Make protein

Question 9

Magnesium

Answer 9

Make chlorophyll

Question 10

Phosphates

Answer 10

Makes DNA, ATP and cell membranes

Question 11

Xylem

Answer 11

Carries water and minerals up the plant

Question 12

Phloem

Answer 12

Carries sucrose and amino acids up and down the plant

Question 13

Define transpiration

Answer 13

The evaporation of water from the leaves via the stomata measured using a potometer

Question 14

Factors that affect the rate of transpiration

Answer 14

1. Air movement
2. Humidity
3. Temperature
4. Pressure
5. Light intensity
6. Water availability