13.4 Hot and cold

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Slide 1: Slide
BiologieMiddelbare schoolhavoLeerjaar 3

This lesson contains 20 slides, with interactive quizzes, text slides and 1 video.

Items in this lesson

Slide 1 - Slide


This chapter
ST CH13 (thursday april 25th)
BT CH13 + CH14 in the testweek


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Slide 2 - Slide

13.4 Hot and cold
  • Welcome!
  • Learning objectives
  • Instruction
 - Warm-blooded and cold-blooded
 - Stay warm
 - Cooling down
 - Desert plants
  • End of class




Learning objectives
  • You will learn how animals are adjusted to cold or hot circumstances.

  • You will also learn how plants are able to survive in a dry environment.




Slide 3 - Slide

 30 sec per question!
15 seconden per vraag!
3 questions about previous paragraphs + 3 questions about 13.4

Slide 4 - Slide

How are oxygen and carbon dioxide transported through an insect's body?
A
By air
B
By bloodcells
C
By water

Slide 5 - Quiz

Water with dissolved substances flows through plants.

Water with nutrients flows up and down through...
A
Xylem vessels
B
Phloem vessels

Slide 6 - Quiz

Humans have..
A
An open single circulatory system
B
An open double circulatory system
C
A closed single circulatory system
D
A closed double circulatory system

Slide 7 - Quiz

Energy is being ... during respiration.
A
used
B
produced

Slide 8 - Quiz

A house thermostat is usually set to approximately 20 ˚C.
What temperature is the thermostat in your brain set to?
A
36˚C
B
37˚C
C
38˚C
D
39˚C

Slide 9 - Quiz

How does your body stay warm?
A
Blood vessels widen + goosebumps
B
Blood vessels widen + shivering
C
Blood vessels narrow + goosebumps
D
Blood vessels narrow + shivering

Slide 10 - Quiz

Discuss with your neighbour without opening your books

What is the difference between warm-blooded and cold-blooded animals? 

Slide 11 - Slide

Warm-blooded = a more or less constant body temperature
Cold-blooded = body temperature varies with that of the environment

Slide 12 - Slide

Warm-blooded animals
Adaptations to the cold

insulation = retain or trap heat 
  • stagnant air between hairs or feathers
  • fat layer in aquatic animals

- more respiration

- special behavior (winter rest and hibernation)


Slide 13 - Slide

Winter rest
  • wakes up once in a while
  • Its body temperature, heart rate and respiratory rate decreases.

Hibernation
  • reserve supply of fat
  • sleeps from late autumn up until spring
  • Its body temperature, heart rate and respiratory rate decreases.

Slide 14 - Slide

Warm-blooded animals
Adaptations to the heat

- air current

- panting

- cold environment


Slide 15 - Slide

Body surface area and cooling down
Small dog: 1 cubes with 6 sides of body surface area
Big dog: 8 cubes with 24/ 48 sides of body surface area 
(lower surface-area-to-volume ratio)


Slide 16 - Slide

Desert plants
  • wax layer
  • small surface area
  • sunken stomata
  • hairs of spines
  • small leaves

Slide 17 - Slide

What?
Make: 13.4 assignments 1-3, 5, 7, 8, 10-12, 14, 15, 18, 19, 22
How?
In your (online) book. You are allowed to help your neighbour. 
Help?
Ask your neighbour first. If you can't figure out the anwser together, then raise your hand. 
Time?
15 minutes
Finished?
Well done!  Check your answers. Then make a summary of 13.3 and 13.4.

Slide 18 - Slide

What did you learn?
  1. - What is the difference between cold-blooded and warm-blooded animals?
  2. - How are warm-blooded animals adapted to the cold?
  3. - How are warm-blooded animals adapted to the heat?
  4. - How are desert plants adapted to the dry conditions?







Don't pack your bags yet!
Stay seated until the bell rings
Don't forget to push your char under the table

Slide 19 - Slide

Slide 20 - Video