\"Nitrogen fixation\" refers to Question 2 options: converting nitrogen gas to c

Question

"Nitrogen fixation" refers to

Question 2 options:

converting nitrogen gas to chemical forms which plants can incorporate.

releasing nitrogen to the air

animals releasing nitrogen in their urine.

applying fertilizer.

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Question 3 (1 point)

Which proposition, explaining why biodiversity is greatest in the tropics, is most strongly supported by scientific evidence.

Question 3 options:

Higher productivity in the tropics allows for more species.

The tropics were not severely affected by glaciation and thus have had more time for species to develop and adapt.

Environments are more stable and predictable in the tropics, with fairly constant temperatures and rainfall levels year-round.

More predators and pathogens limit competition in the tropics, which allows more species to coexist.

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Question 4 (1 point)

The second trophic level is comprised of

Question 4 options:

bacteria, fungi, molds, worms, and insects

plants, algae, and some bacteria

predators

herbivores

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Question 5 (1 point)

Which is the most important group in an ecosystem in terms of energy flow?

Question 5 options:

producers

decomposers

predators

herbivores

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Question 6 (1 point)

When the number of births and deaths are approximately equal, a population is likely

Question 6 options:

Rapidly increasing in size

Going extinct

At or near the carrying capacity

Out of equilibrium

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Question 7 (1 point)

Which of the following is not a characteristic of a r-selected species?

Question 7 options:

Reaches sexual or reproductive maturity in 6 months.

Average gestation period is 4 weeks.

Breeding interval for female of the species is every three to four months.

The number of offspring per litter is one or two.

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Question 8 (1 point)

A species that has an essential role in maintaining ecosystem structure is called a

Question 8 options:

keystone species.

critical species.

endangered species.

predator.

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Question 9 (1 point)

The competitive exclusion principle states that no two organisms can have identical

Question 9 options:

Nesting areas

Ecological niches

Ranges of abiotic tolerance

Population sizes

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Question 10 (1 point)

In ecology, succession refers to

Question 10 options:

survival of the fittest.

predator-prey relationships.

one species or group of species gradually being replaced by another.

one generation followed by another over time

converting nitrogen gas to chemical forms which plants can incorporate.

releasing nitrogen to the air

animals releasing nitrogen in their urine.

applying fertilizer.

Explanation / Answer

Question 2 :

Answer - converting nitrogen gas to chemical forms which plants can incorporate

* Nitrogen fixation is a process by which nitrogen in the earth's atmosphere is converted into ammonia or other molecules available to living organisms.

Question 4

Answer - herbivores

A food chain starts at tropic level 1 with producers such as plants, can move to herbivore at level 2, predators at level 3 and finish with carnivores or apex predators at level 4 and 5.

Question 5

Answer- producers

Ecosystems maintain themselves by cycling energy and nutrients obtained from external source, at the first tropic level primary producers like plants, algae, bacteria use solar energy to produce organic plant material through photosynthesis.

Question 6

Answer - at or near the carrying capacity

Question 8

Answer - keystone species

A keystone species is a plant or animal that plays a unique and crucial role in a way an ecosystem functions, without keystone species the ecosystem would be drastically different.

Question 10

Answer - one species or group of species gradually being replaced by another

*Ecological succession is a process of change in the species structure of a ecological community over time, it is a phenomenon or process by which an ecological community undergoes more or less change leading to the formation of new habitat.

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