B4.2 Ecosystem

Question 1

________ is an organism that can only live in a narrow range of conditions.

Answer 1

Specialist species

Question 2

___________ is a method of generating ATP by organisms when no oxygen is present (anaerobic).

Answer 2

Fermentation

Question 3

_________ can be used as an electron acceptor by obligate anaerobes.

Answer 3

Sulfate

Question 4

_______ nutrition refers to organisms that take in their food for processing internally.

Answer 4

Holozoic

Question 5

Which of the following are adaptations of predators that can assist in their hunt and killing of prey.

Answer 5

I. Acute sense of sight
II. Bright colour patterns that warn of venom

Question 6

Identify which of the following adaptations are used by both predators and prey in their quest for survival.

Answer 6

Camouflage
II. Anti-venom proteins
III. Cooperation among members of the species

Question 7

According to the competitive exclusion principle, two species cannot continue to occupy the same ____.

Answer 7

niche

Question 8

what factors can influence the realized niche of an organism.

Answer 8

competition, availability of resources, predation pressure

Question 9

Most archaea carry out chemotrophic nutrition and gain their energy and nutrients by breaking down or metabolising molecules from their environment such as ___, ___, ___.

Answer 9

iron, ammonia, hydrogen sulfide

Question 10

Homo erectus are hominid ancestors of humans that lived from about 1.89 million years ago to 143 000 years ago. During that time their brains became bigger and teeth and jaws became smaller. What is the most accepted hypothesis for this?

Answer 10

H. erectus learned to control fire and cook food

Made food softer to eat, big teeth not necessary for survival