Lecture 4-Organisms and resources

Question 1

What is an important factor for sessile organisms in the environment?

Answer 1

-space

Question 2

What resources do plants use? Are all the same?

Answer 2

• same

- light , CO2, H2O,O2, mineral micronutrients (N, P,K,S,Ca,Mg.Fe) and trace elements

Question 3

What does C3, C4, CAM refer to in plants?

Answer 3

-type of photosynthesis
C4-water efficient as CO2 used more efficiently -so good for warm climate
-CAM highly water efficient as fix CO2 at night and keep stomata close during the day

Question 4

What limits photosynthesis?

Answer 4

• temperature

- availability of other resources like H20

Question 5

Why do some plants resort to being carnivorous?

Answer 5

-low nutrient availability

-

Question 6

What are the 3 main types of consumption of food resources?

Answer 6

• decomposition(bacteria, fungi, detrivorous animals)
• prasitism(consumer that does not kill its food organism)
• predation (the food organism or part of it is eaten and killed

Question 7

How do generalists and specialists differ ein terms of food?

Answer 7

generalists= wide variety of food
specialist= narrow variety (may limit where it can live)

Question 8

What are essential and substitutable resources?

Answer 8

essential- can’t substitute

substitutable- can substitute