B2 Revision Flashcards

What classification system is based on one or two characteristics?
Artificial system
1 of 52
What classification system is based on evolutionary relationships?
Natural system
2 of 52
All organisms are named by which system?
The binomial system
3 of 52
What is a group of organisms that can interbreed to produce fertile offspring called?
A species
4 of 52
How do bacteria reproduce?
Bacteria do not interbreed, they reproduce asexually.
5 of 52
Dolphins have similarities to fish because they live in the same habitat. What type of relation is this?
Ecological relation
6 of 52
What are organisms produced when members of two species interbreed called?
7 of 52
What characteristic means that hybrids cannot be classed as a species?
Hybrids are infertile.
8 of 52
Organisms may have different features if they live in different ........?
9 of 52
What can be used to see how similar organisms are and help to reclassify them that was not available 60 years ago?
DNA analysis - sequencing the bases in DNA has enabled scientists to know much more about closely related organisms.
10 of 52
Pyramids of biomass show the ..... ..... of living material at each stage of a food chain.
Dry mass
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Pyramids of biomass may look different to pyramids of numbers if .......... are very large.
12 of 52
What organism that feeds of another living organism could also affect how pyramids of biomass look compared to pyramids of numbers?
13 of 52
As energy flows along a food chain some is used in growth. Most of the energy, however, is transferred into less useful forms such as heat from ...........
14 of 52
The material that is lost at each stage of the food chain is not wasted. Most of the waste is used by ............
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The ................. of energy transfer can be calculated between trophic levels.
16 of 52
Which cycle partially involves plants and animals respiring?
Carbon cycle
17 of 52
Decomposers are soil bacteria and fungi. What do they convert proteins and urea into?
18 of 52
What converts the ammonia to nitrates in the nitrogen cycle?
Nitrifying bacteria
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What do denitrifying bacteria convert nitrates into in the nitrogen cycle?
Nitrogen gas
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Nitrogen-fixing bacteria living in root nodules fix nitrogen gas. What does this also occur by?
Action of lightning
21 of 52
Which type of soils will decay be slower in?
Waterlogged soils
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What is one thing that decomposers need to break down dead material in soil?
23 of 52
What conditions will also slow down decay?
Acidic conditions
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An ................ ................ describes the habitat that an organism lives in and also its role in the habitat.
Ecological niche
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Sometimes both organisms benefit as a result of their relationship. What is this called?
26 of 52
Give one example of mutualism.
Pollination of flowers by insects
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Pea plants also benefit from mutualism. Pea plants are legumes with structures on the roots called nodules. What live in these nodules?
Nitrogen-fixing bacteria
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Some animals are adapted to living in very cold conditions. The keep warm by reducing heat loss. This means that they have excellent ................ to cut down heat loss.
29 of 52
Which animal has a counter-current heat exchange mechanism to help reduce heat loss?
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Other organisms that live in cold climates may have biochemical adaptations, such as .............. .............. in their cells.
Antifreeze proteins
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Name one organism that lives in a desert.
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What is the type of adaptation called when camels increase the loss of heat by having very little hair on the underside of their bodies?
Anatomical adaptation
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What are organisms that can survive in hot conditions called?
34 of 52
What are organisms like polar bears called?
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Rats can live in several habitats. What are these organisms called based on this?
36 of 52
What is there within any species? (Natural selection)
37 of 52
Organisms might be prevented from mating because they live in different areas. What type of isolation is this?
Geographical isolation
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Organisms might also be prevented from mating due to what other type of isolation?
Behavioural isolation
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More and more bacteria are developing resistance to what? (Natural selection)
40 of 52
Before Darwin, Jean Baptiste de Lamarck had a different theory, called law of the ............. ..............
Law of the acquired characteristics
41 of 52
Carbon dioxide (from the burning of fossil fuels) may increase the greenhouse effect and what else?
Global warming
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Name one organism that is killed by acid rain (caused by sulfur dioxide)...
Fish (or trees)
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The human population of the world is growing at an ever-increasing rate. This is called ..................... growth.
Exponential growth
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The growth in population is happening because the birth rate is exceeding the ......... .........
Death rate
45 of 52
What is the amount of pollution caused per person or organisation called?
Carbon footprint
46 of 52
Pollution in water or air can be measured using direct methods or by what?
Indicator organisms
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What is the advantage of using direct methods to measure pollution?
It is much more accurate.
48 of 52
What is one thing that conservation can protect?
Food supply/plants and animals required for medical uses/organisms and habitats/food chains
49 of 52
What do some countries want to lift the ban on in terms of conservation?
50 of 52
Scientists believe there is a need to kill some whales to help find out more about how whales can survive at ............. .............
Extreme depths
51 of 52
Name one resource in relation to providing energy that is not sustainable.
Fossil fuels
52 of 52

Other cards in this set

Card 2


What classification system is based on evolutionary relationships?


Natural system

Card 3


All organisms are named by which system?


Preview of the front of card 3

Card 4


What is a group of organisms that can interbreed to produce fertile offspring called?


Preview of the front of card 4

Card 5


How do bacteria reproduce?


Preview of the front of card 5
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