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IT’S A GREEN WORLD. Plants need minerals too. Starter. If you were growing geraniums in the lab, list the things they will need to grow well. Light, water, minerals What type of minerals? Nitrates, phosphates, potassium and magnesium. Plants need minerals too. Learning objectives.

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IT’S A GREEN WORLD

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It s a green world

IT’S A GREEN WORLD

Plants need minerals too


Starter

Starter

If you were growing geraniums in the lab, list the things they will need to grow well.

Light, water, minerals

What type of minerals?

Nitrates, phosphates, potassium and magnesium


Plants need minerals too

Plants need minerals too

Learning objectives

Success criteria

Be able to describe the effect of deficiency of certain minerals on plant growth

Relate the information on packets of fertiliser to mineral content

Show understanding of active transport by completing w/s B4d6

  • Explain that mineral deficiencies result in poor plant growth

  • Understand that fertilisers are added in improve crop yields

  • Explain the uptake of minerals by active transport


Not enough minerals

Not enough minerals!

What happens if plants do not get enough minerals?

Plants do not grow properly if they are deprived of minerals and begin to look unhealthy.

If a plant does not get enough of a mineral it is said

to have amineral deficiency.

Do mineral deficiencies affect a plant in the same way?


It s a green world

Mineral deficiency – no nitrogen!

Nitrogen is used for making leaves and is probably the most important mineral for plant growth.

What is the effectofnitrogen deficiency?

upper leaves

pale green

lower leaves yellow and dead

weak stem


Mineral deficiency no phosphorus

Mineral deficiency – no phosphorus!

Phosphorus is used for making roots and is important for all the other minerals used by plants.

What is the effectof phosphorus deficiency?

discoloured leaves

small roots


Mineral deficiency no potassium

Mineral deficiency – no potassium!

Potassium is used for making flowers and fruit, so crops are given extra potassium before they start to fruit.

What is the effect of potassium deficiency?

poor flower

and fruit growth

discoloured leaves

with dead spots


Mineral deficiency no magnesium

Mineral deficiency – no magnesium!

Magnesium is used for making chlorophyll and so is vital for the process of photosynthesis.

What is the effectof magnesium deficiency?

upper leaves normal (leaves turn yellow from bottom upwards)

lower leaves pale green or yellow


Task mineral deficiency

Task – Mineral deficiency

Create a table to show the effects of the deficiency of the following minerals on plant growth:

Nitrates

Phosphates

Magnesium

Potassium

Use p69 of the textbook to help you


Fertilisers

Fertilisers

By law the manufacturer of a product described as a ‘fertiliser’ must declare the nitrogen, phosphates and potash content on the package. Also any other nutrients that have been added to the product.

3:6:9

10kg

NPK Fertiliser

The phosphorus content:

This fertiliser contains

6% P2O5 (phosphates)

The nitrogen content:

This fertiliser contains

3% N (nitrogen)

The potassium content:

This fertiliser contains

9% K2O (potash)


How do minerals enter plants

How do minerals enter plants?

Like water, minerals enter plants through the roots. However, they do this by different methods.

Water passively diffuses with a concentration gradient from the soil into the roots and up the stem.

Minerals are usually found in the soil in lower concentrations than they occur in the plant.

Why can they not be transported by diffusion?

Diffusion cannot take place against a concentration gradient.

Instead, minerals enter the roots by active transport.


It s a green world

What is active transport?

Active transport uses energy from respiration to move substances against a concentration gradient.

soil

root hair cell

Specific minerals from the soil enter through channels in the cell walls of the root hair cells.

The minerals then travel around the plant in the xylem vessels.

Plants may take up some minerals in the soil but not others. Why is it important that plants select which minerals to transport?

mineral


Active transport

Active transport


It s a green world

Task

Complete B4d6 – Barley seedlings

More sulfate ions are absorbed when oxygen is present (almost doubles)

Respiration

Respiration releases oxygen, which is needed for the active transport of mineral ions

In soil, water and air occupy the same space; if there is too much water, there will be less, or not enough, air (oxygen) for respiration


Plenary transporting minerals

PlenaryTransporting minerals


Plants need minerals too1

Plants need minerals too

Learning objectives

Success criteria

Be able to describe the effect of deficiency of certain minerals on plant growth

Relate the information on packets of fertiliser to mineral content

Show understanding of active transport by completing w/s B4d6

  • Explain that mineral deficiencies result in poor plant growth

  • Understand that fertilisers are added in improve crop yields

  • Explain the uptake of minerals by active transport


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