Kaupapa: 01 / 11 Wednesday Describe why plants need water Describe how plants absorb water from their roots

Do you remember? Explain why the leaves are important Describe the features of the leaves Explain why the stem is important

Parts of a plant Leaf Stem Root

Why do plants need water?

Plants need water so they can: Obtain the dissolved minerals that keep them healthy Allow chemical reactions such as photosynthesis to occur Transport substances around the plant Stay upright Keep cool

How does water enter a plant?

How are roots adapted to absorb water?

Warning

Roots Branched and spread out through the soil to get lots of water. Water is absorbed by osmosis. Covered with root hair cells which have thin walls and large surface area to maximise osmosis.

Practical – Osmosis & Potato

Practical - Observing root hair cells

There is another reason why plants need roots...

Multiple-choice quiz

Anagrams

What have we learned today? Why do plants need water? How are the roots adapted to absorb water?

How does water enter a plant? Water is one of the raw materials needed for plants to carry out photosynthesis. How does water enter a plant? Water from the soil enters a plant through the roots. You can’t normally see them but roots are a very important part of a plant. Why are roots branched and spread out through the soil?

How are roots adapted? water Roots are branched and spread out for two reasons: to absorb water (and mineral salts) from a large amount of soil. to anchor the plant in the soil. Taking a closer look, roots are covered in root hair cells. Root hair cells have thin walls and a large surface area to help them absorb lots of water. How are roots adapted to their job? water