Size and Surface Area
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1
Why do organisms exchange substances with their environment?
To take in oxygen, nutrients, and remove waste.
2
What do cells need for aerobic respiration?
Oxygen.
3
Why do organisms excrete carbon dioxide and urea?
To remove waste products.
4
How does an organism’s exchange depend?
On surface area to volume ratio.
5
Which has a higher surface area to volume ratio, smaller or larger animals?
Smaller animals.
6
What happens when an organism has a larger surface area relative to volume?
It loses heat faster.
7
What is the surface area of a 2 cm cube?
24 cm².
8
What is the volume of a 2 cm cube?
8 cm³.
9
What is the surface area to volume ratio of a 2 cm cube?
3:1.
10
Why do multicellular organisms need exchange systems?
Small surface area to volume ratio.
11
How do single-celled organisms exchange substances?
Direct diffusion.
12
Why can’t multicellular organisms rely on diffusion alone?
Cells are deep inside the body.
13
What is mass transport in animals?
The circulatory system.
14
What is mass transport in plants?
Xylem and phloem.
15
How does body size affect heat exchange?
Smaller animals lose heat faster.
16
Why do animals with compact shapes lose less heat?
Smaller surface area relative to volume.
17
Why do animals in cold climates have small ears?
To minimize heat loss.
18
What adaptation helps desert animals stay cool?
Large surface area to volume ratio.
19
How do animals with thick fur reduce heat loss?
Insulation.
20
Why do hippos stay in water?
To stay cool.
21
What do small mammals eat more of compared to larger ones?
High-energy food.
22
How do arctic foxes survive in their environment?
Small ears and compact bodies.
23
What adaptation do African bat-eared foxes have?
Large ears to increase heat loss.
24
How do behavioral adaptations help reduce heat loss?
Hibernation in winter.
25
What happens to cube animals as they increase in size?
Surface area to volume ratio decreases.
26
What is an example of a waste product transported in animals?
Carbon dioxide.
27
Why do multicellular organisms need specialized systems?
Efficient exchange of substances.
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