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