L2-Surface area adaptations

Explain how the size of an organism effects heat loss?

the greater the mass of an organism, the higher the …1? rate. Therefore, a single rhino consumes more oxygen within a given period of time compared to a single mouse

BMR PER UNIT BODY MASS

Although metabolic rate increases with body mass, the BMR per unit of body mass is …2? in smaller animals than in larger animals. Smaller animals have a greater SA:V ratio so they lose more heat, meaning they have to use up more …3. to maintain their body temperature.

he rate of heat loss from an organism depends on its surface area. If an organism has a large volume, e.g. a hippo, its surface area is relatively small. This makes it harder for it to lose heat from its body since heat has a smaller area to escape the body.. If an organism is small, e.g. a mouse, its relative surface area is large, so heat is lost more easily. This means smaller organisms need a relatively high metabolic rate, in order to generate enough heat to stay warm.

1.metabolic. 2.higher. 3.energy

Shape:

1) Animals with a compact shape have a …1? surface area relative to their volume minimising heat loss from their surface.

2) Animals with a less compact shape (those that are a bit gangly or have sticky outy bits) have a …2? surface area relative to their volume - this …3? heat loss from their surface.

3) Whether an animal is compact or not depends on the temperature of its environment.→ examples in the image

1.small. 2.larger. 3.increases

What are behavioural and physiological adaptations?

2.What is mass transport?

* Behavioral: What an animal *does* to survive (like migrating).

* Physiological: How an animal's body *works* to survive (like making venom).

2.Movement of substances from exchange surfaces to the oart of the cell where it is needed.

Info:Not all organisms have a body shape or size to suit its climate:

◦ Some desert animals have kidney structure adaptations so that they produce less urine to compensate.

•Small mammals living in cold regions need to eat large amounts of high energy food such as seeds or nuts.

○ Smaller mammals may have thick layers of fur or hibernate when weather is cold.