Revision

Question 1

Unicellular ??

Answer 1

A unicellular organism, also known as a single-celled organism, is an organism that consists of only one cell, unlike a multicellular organism that consists of more than one cell

Question 2

What are the benefits of a small SA:V ratio

Answer 2

-faster rate of absorption

Question 3

What are the benefits of a large SA:V ratio

Answer 3

• More efficient/ faster exchange of substances across the cell membrane eg cell waste products moving out of the cell, nutrients moving into the cell.

Question 4

What is surface area to volume ratio??

Answer 4

SA:V, is the amount of surface area per unit volume of an object or collection of objects

Question 5

Define isotonic

Answer 5

having the same concentration of dissolved substances as the solution to which it is compared

Question 6

Define hypotonic

Answer 6

having a lower concentration of dissolved substances than the solution to which it is compared

Question 7

Define hypertonic

Answer 7

having a higher concentration of dissolved substances than the solution to which it is compared

Question 8

Define aerobic respiration

Answer 8

the breakdown of glucose to simple inorganic compounds in the presence of oxygen and with release of energy that is transferred to ATP

Question 9

Define anaerobic respiration

Answer 9

respiration that occurs without
the involvement of oxygen; the end products of anaerobic respiration in human muscle are lactic acid and carbon dioxide

Question 10

What is an autotrophs?

Answer 10

organisms that, given a source of energy, can produce their own food from simple inorganic substances; also known as producers

Question 11

What are heterotrophs?

Answer 11

organism that ingests or absorbs food in the form of organic material from their environment; also known as a consumer

Question 12

What is the mamalain system

Answer 12

The mammalian respiratory system equilibrates air to the body, protects against foreign materials, and allows for gas exchange.

Question 13

What is an adaptation

Answer 13

BIOLOGY
the process of change by which an organism or species becomes better suited to its environment.
“living in groups is an adaptation to increase the efficiency of hunting”

Question 14

What is a physiological adaptation?

Answer 14

Physiological Adaptations are internal systematic responses to external stimuli in order to help an organism maintain homeostasis.

Question 15

What is a structural adaptation?

Answer 15

Structural adaptations are physical features of an organism like the bill on a bird or the fur on a bear.

Question 16

What is a behavioural adaptation?

Answer 16

Behavioral adaptations are the things organisms do to survive. For example, bird calls and migration are behavioral adaptations. Adaptations are the result of evolution. Evolution is a change in a species over long periods of tim

Question 17

Malfunctions of homeostasis

Answer 17

Diabetes

Dehydration

Question 18

Biodiversity meaning

Answer 18

total variety of life forms, their genes and the ecosystems of which they are a part; biodiversity can relate to planet Earth or to a given region

Question 19

Food chain

Answer 19

one kind of representation to show chemical energy ow within an ecosystem beginning with producers

Question 20

Food web

Answer 20

one kind of representation of energy ow in an ecosystem; a food web comprises interrelated food chains

Question 21

Define symbiosis

Answer 21

prolonged association between di erent species in a community in which at least one partner bene ts; includes parasitism, mutualism and commensalism

Question 22

Multicellular ??

Answer 22

Multicellular organisms are organisms that consist of more than one cell, in contrast to unicellular organisms.

All species of animals, land plants and most fungi are multicellular, as are many algae, whereas a few organisms are partially uni- and partially multicellular, like slime molds and social amoebae such as the genus Dictyostelium.