Evolution & Extinction - 无忧得胜-网上国际课程 (5edu.win)

1#

State how many mass extinction events there have been on Earth, inclj*1r6 0,p2ityh zur l,uxub 88.gi8onk bgsu(uding the current mass extinction caused sup8tkro*x jn,y(6l2zi1b8h, u gg0buu8. riby humans.

A. 2

B. 3

C. 5

D. 6

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Define evolution.

A. Heritable characteristics of a species change over time.

B. Organisms are reproductively isolated.

C. Learned behaviours change over time.

D. Organisms are bred for desired characteristics.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

State which factor has not causedsyn.cj2ff4kj2y cd2 p*y 3 ux; a mass extinction in the past.

A. Plate tectonics

B. Ice ages

C. The ozone hole

D. Impact of a meteorite

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Figure: A peppered m jch vs(s;+5a.xnwvs:r 6or. fshpj6)oth camouflaged on a tree

As pollution levels rise, the trees that the peppered moth (Biston betularia) lives on will become darker. Deduce the effect this will have on the peppered moth population numbers.

A. Numbers of peppered moths will decrease

B. Numbers of peppered moths will increase and then stabilise

C. Numbers of peppered moths will remain constant

D. Numbers of peppered moths will increase

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

List three factors that could describe de)7 8(mgrm)by lwtr6 a species' niche.

A. Factor 1 is predators,Factor 2 is altitude,Factor 3 is salinity

B. Factor 1 is prey,Factor 2 is genetics,Factor 3 is precipitation

C. Factor 1 is herbivores,Factor 2 is competitors,Factor 3 is photosynthesis

D. Factor 1 is speciation,Factor 2 is parasites,Factor 3 is temperature

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Figure: Tuskless female elephants in Gorongosa8-g p e,q3aee )ab,ibo

Both male and female African elephants (Loxodonta africana) are usually born with tusks. It has been observed that in Gorongosa National Park, Mozambique, some female elephants are born without tusks.

Suggest how natural selection explains the trend shown in the graph.

A. Elephants broke their tusks while fighting, and their offspring were born without tusks.

B. Poachers hunted elephants with tusks, resulting in increased survival of elephants without tusks.

C. Elephants born without tusks are better fighters so survived better.

D. Mutations resulting in no tusk formation started to happen more often.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

In a population of finches, the frequency of finches eb/mk-m 7l cv9jt qm/+with large beaks has increased relative to the frequency of finches with small beaks. Sugg/ljme-b9v/7+ mqt k cmest a possible cause for this.

A. A decrease in the competition for food

B. A change in the availability of seeds

C. Selection in favour of individuals with small beaks

D. An increase in the heritability of beak size

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Determine which is nxt fupwxp 1)ouma4-)x0)h k-sot an example of natural selection.

A. Elephants and hippopotami have similar body types.

B. Peacocks with bright feathers are more likely to breed.

C. Giraffes with longer necks are less likely to starve as they can reach leaves higher up in trees.

D. Zebras that are born with white fur are more likely to be killed by predators.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Figure: A broad leaf in a tropiod**(st z.rin,ker8 a cal rainforest

Broad-leaved plants are often found near the ground in tropical rainforests. Identify the characteristic of the leaf that is an example of a useful adaptation.

A. Leaves are covered in a thin layer of wax to allow for the absorption of more water.

B. Leaves have a large surface area to allow them to float on water.

C. Leaves have curled edges to capture more rainwater.

D. Leaves have a large surface area to absorb more sunlight.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Suggest three environmental changes that may lead to the isolation o3-4, ftc:gxuheq qo8yf populationsu4-,heo3 g yq xfc8q:t of a species and thus to speciation

A. River changes is a river drying up into lakes, Climate changes is a drier climate,Ocean change is sea level rising

B. River changes is a river changing course,Climate changes is a stable climate,Ocean change is sea level dropping

C. River changes is a seasonal river,Climate changes is a wetter climate,Ocean change is an island forming

D. River changes is a river becoming deeper,Climate changes is a warmer climate,Ocean change is a tsunami occuring

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