ODWS icon

The Open Door Web Site
HOMEPAGE CHEMISTRY PHYSICS ELECTRONICS HISTORY HISTORY OF SCI & TECH MATH STUDIES LEARNING FRENCH STUDY GUIDE  PHOTO GALLERY
BIOLOGY HOMEPAGE  IB BIOLOGY WEB TOPIC CHAPTERS FACTS & FIGURES LABORATORY WORK QUESTIONS & QUIZZES ECOLOGY CLUB PLAYS

Part IV : How Plants Feed

Feeding in Green Plants
Feeding in Green Plants Summary
(useful for revision)

Feeding in Green Plants : Questions

Plants which Feed in Different Ways

Topic Chapters Index

 

Deciduous Forest 

Deciduous Forest, Meudon, France

 

Rainforest 

Rain Forest, Costa Rica

MINERALS IN PLANTS

Custom Search

Some minerals are very important to plants, especially those minerals which contain the elements nitrogen, phosphorus and potassium. You will find these three elements in all the fertilizers given to plants.

Here are the results of an experiment where wheat plants were grown with different fertilizers:

 

Fertilizer given to the plants

Amount of wheat harvested/tonnes

None

96

Nitrogen only

157

Nitrogen and Phosphorus

166

Nitrogen, Phosphorus and Potassium

212

 

You can see that the plants grow better if they are given fertilizer which contains minerals but it is important to understand that all the minerals must be present to give the best growth.

 

Organic Matter

Green plants are special because they need sunlight if they are to grow strong and healthy. A plant growing in the dark grows tall but very thin and weak, with small, yellow leaves. If you measure its mass you will find that it is a lot less than the mass of a similar plant growing in the light.

The green colour of these plants is caused by a pigment called chlorophyll (which comes from the Greek and means "the colour of leaves"). Light is necessary for the plant to make chlorophyll. Light is also needed for the chlorophyll to function properly in the process called photosynthesis. (This word also comes from the Greek and it means "making things using light".)

 

Fact File No.24

The largest leaves are found on the raffia palm which grows naturally on islands in the Indian ocean. These leaves can reach up to 19,8 m in length.

 

The plant uses light from the sun and chlorophyll to make organic matter from carbon dioxide gas and water. Oxygen gas is produced by this process. Therefore, in daylight, green plants absorb a lot of carbon dioxide and release oxygen.

When they photosynthesize, green plants grow bigger and stronger as they make more organic matter.

 

Fact File No.25

In a single year 1 hectare of forest absorbs 22 tonnes of carbon dioxide and gives out 16 tonnes of oxygen.

When a wheat seed germinates and grows into a fully mature wheat plant, it increases its mass 325 times. A farmer who sows 100 kg of seeds per hectare in the spring will harvest 7,5 tonnes of seeds per hectare in September.

 

The Open Dor Web Site is non-profit making. Your donations help towards the cost of maintaining this free service on-line.

Donate to the Open Door Web Site using PayPal

SITE MAP
WHAT'S NEW?
ABOUT

PRIVACY

COPYRIGHT

SPONSORSHIP

DONATIONS

ADVERTISING

© The Open Door Team 2017
Any questions or problems regarding this site should be addressed to the webmaster

© Paul Billiet and Shirley Burchill 2017

Hosted By
Web Hosting by HostCentric


SiteLock