6.3 Stems 1HVTTO

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

6.3 Stems

• Jacket in your locker
• Put your things on your desk

       Laptop/Book

       Notebook, pencil case

• Bag on the floor
  
• Read pages 154-157

Lessongoals

• Remember: I can define the difference between woody and herbaceous plants by naming at least two characteristics of each type.
  
• Understand: I can explain how vascular bundles work by describing their role in the transport of water, minerals, and nutrients in plants.
  
• Apply: I can use the concept of osmosis and evaporation to describe how water is pushed and pulled up through the stem, using correct biological terms in a short explanation.
  
• Analyze: I can analyse annual rings by identifying what thick and thin layers say about the growing conditions in a given year.

Homework 6.3

Plant structures

What type of rootsystem is shown in the picture?

1. Fibrous root system
2. Taproot system
3. Impossible to tell

What part of the root is mainly responsible for absorbing water?

1. Primary root
2. Root hairs
3. Entire root system
4. Different for each plant

Stems take many shapes. But there are 2 main types.

Can you think of the main difference between these 2 types of stem?

Osmosis helps plants absorb water.

Thanks to osmosis, water moves from a place of ... concentration to a place with ... concentration of water

1. high > low
2. low > high
3. Different each time

Herbaceous

• Sturdy because of water
• Wilts without water

Woody

• Sturdy because of wood

Stems

A lot of plants have both woody and herbaceous stems!

!

sturdy = strong/ rigid /not wanting to bend easily

(to) wilt = plant losing its rigidity/sturdiness

Here the wood is oldest

Here the wood is youngest

Lots of growth happened

Little growth happened

Annual rings

• Trees only grow during spring and summer
• Spring > Big layer (lots of growth) > springwood
• Summer > Thin layer (little growth) > summerwood
• 1 layer springwood + 1 layer summerwood = 1 annual ring

It can be hard to tell the actual age of a tree from its annual rings.

The inner rings are usually pressed together, making it hard to tell them apart.

!

Functions of stems

• Transport substances:

Water and nutrients

• Rigidity (sturdiness)
• Carries other structures:

Leaves, flowers, fruit

Lateral root is a different name for a secondary root

Skip

You can skip the parts of the text called:

• Parts of a stem
• The stem of a tree: The trunk

What you should do: 6.3

• Pages 154-157 TB
• Asgmt  23, 24, 29, 30 pgs. 161-164 WB

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zs = Working in Silence

• No asking questions
• Silent, don't disturb anyone
  
• Stay at your  desk

What you should do: 6.3

• Pages 154-157 TB
• Asgmt 23, 24, 29, 30 pgs. 161-164 WB

Done with the above?

• Work on the next chapter(s)
• Learn for the test 
• Make other homework
• Read a book

Zw = Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your  desk

Roots and stems have their own functions.
But one of their functions is kinda similar.

Which function is that?

Tidy Duty

3 people each lesson

• Desks: empty and straight
• Chairs:  underneath the desks OR end of day: on the desks
• Floor: no rubbish