Question

1) In ecology, "productivity" essentially means

a) the amount of energy in an ecosystem.

b) the amount of work that is accomplished.

c) the amount of biomass of organisms generated over time.

2) Of the five patterns showing how species richness varies with productivity, the ________ pattern is least common.

a) positive

b) u-shaped

c) hump-shaped

d) negative

e) neutral

3) When there is a hump-shaped relationship between productivity and species richness, it is because

a) only a few competitively dominant species are found in the most productive ecosystems.

b) species richness always decreases with productivity.

c) species richness always increases with productivity.

d) not many species can persist when there is a lot of biomass.

4) Figure 18.10b demonstrates that species richness of ________________ have the most variedresponse to productivity.

a) terrestrial vertebrates

b) aquatic invertebrates.

c) terrestrial invertebrates

d) terrestrial plants

5) Generally speaking, when there is greater habitat diversity there is _____________ species richness.

a) lesser

b) no effect on

c) greater

6) Robert Paine's classic study showed that the starfish Pisaster is a keystone species because

a) when it was removed from the community, species richness increased.

b) when it was removed from the community, species richness decreased.

c) when it was added to the community, species richness increased.

d) when it was added to the community, species richness decreased.

7) Keystone species

a) can affect community structure regardless of population size.

b) have the most biomass in a community.

c) are usually top predators.

d) are invasive predator species that eat native herbivores.

8) Consider three forests:

• forest A is managed with fire and is burned on an annual basis, which clears the ground layer vegetation away.
• forest B is managed with active fire suppression, and as a result, it has not burned in more than 60 years.
• forest C is only lightly managed, where fires are allowed to burn when they occur naturally.

According to the intermediate disturbance hypothesis, which forest likely has the greatest plant diversity? Answer with only the letter of the forest.

Answer 1

Q1. Answer:Option c, The amount of biogas of organism generated overtime.

Explanation:

Mass / unit surface / time (gm / m2/day) is how it is usually represented.

Q2. Answer: Option c, hump shaped

Explanation:

For certain cases, hump-shaped relationships are normal, as species wealth approaches the cap, food and shelter competition becomes more intense.

Q3. Answer: Option a, only a few competitive dominant species are found in the most productive ecosystems.

Q4. figure is not given

Q5. Answer :Option c, greater

Q6. Answer: Option b, when it was removed from the community, species richness decreased.