B6 Plant Nutrition

Question 1

In order to photosynthesise plants absorb energy from __________ using a special chemical contained in the leaves called __________ . During photosynthesis, __________ from the air is combined with water from __________ to make __________ .

Answer 1

Light (or sunlight)
Chlorophyll
Carbon dioxide
Soil (or the ground)
Glucose (or sugars/carbohydrates)

Question 2

Can plants photosynthesise at day, at night or all the time?

Answer 2

Only during the day

Question 3

Can plants respire at day, at night or all the time?

Answer 3

All the time

Question 4

In order to germinate, which of these does a broad bean seed require? Fertiliser, soil, sunlight or water?

Answer 4

Water

None of the other things HAVE to be present

Question 5

In the carbon cycle the process which reduces the amount of carbon dioxide in the atmosphere is…

Answer 5

Photosynthesis

Question 6

Plants get mineral nutrients like nitrates from the…

Answer 6

Soil

Question 7

To increase the surface area available for absorbing water and minerals, plants have…

Answer 7

Root hairs

Question 8

Describe a method for safely removing the green substance from a plant’s leaf.

Answer 8

Boil the leaf in water to soften it.
Boil the leaf in ethanol to remove the green substance.
Heat ethanol using a water bath (not a flame).

Question 9

As well as water, what else must plants obtain from the soil?

Answer 9

Mineral nutrients, such as nitrates.

Question 10

Name a mineral nutrient required by plants.

Answer 10

Nitrates

or phosphorus, potassium, magnesium…

Question 11

Carbon dioxide for photosynthesis enters the plant through…

Answer 11

Pores in the leaves (called stomata)

Question 12

Complete the word equation for photosynthesis to show the 2 reactants and the 2 products:

__________ + water —> __________ + oxygen

Answer 12

Photosynthesis
Reactants: Carbon dioxide and Water
Products: Glucose and Oxygen

Question 13

Chlorophyll is used by plants to…

Answer 13

Make glucose (by photosynthesis)

Question 14

Write down the word equation for photosynthesis.

Answer 14

Carbon Dioxide + Water __> Glucose + Oxygen

Question 15

Which of these would increase the levels of oxygen in the atmosphere? Burning coal, farming cattle, driving cars or planting forests?

Answer 15

Planting forests

Question 16

Suggest how plants can modify their leaves to reduce water loss on hot days.

Answer 16

Guard cells can close the stomata (leaf pores) to prevent water vapour escaping.

Question 17

Explain why the roots of plants are covered in microscopic root hairs.

Answer 17

To increase the surface area available for absorbing water and minerals.

Question 18

Suggest a reason why plants need carbohydrates like starch and glucose.

Answer 18

Plants need energy so their cells must respire.
Starch is important for growth.
Glucose can be used to attract pollinators.

Question 19

A solution that could be used to show that leaves produce starch is…

Answer 19

Iodine solution.

It starts yellowy red and goes blue or black when starch is present.

Question 20

Plants get glucose…

Answer 20

By photosynthesising

Question 21

Water evaporating from the leaves of plants is called…

Answer 21

Transpiration

Question 22

From the soil, root hair cells can absorb which of these? Carbon dioxide, glucose, nitrates or protein?

Answer 22

Nitrates

These are essential mineral nutrients required for healthy plant growth.

Question 23

Does a plant gives out carbon dioxide during the day, at night, or all the time?

Answer 23

All the time, when it is respiring.