B2 Revision Questions Part 1
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1 B2 Revision Questions Part 1 Higher only questions are underlined
2 Question 1 What are the two different ways that things can be classified?
3 Answer 1 Artificially and naturally
4 Question 2 What is natural classification?
5 Answer 2 Natural classification is based on evolution
6 Question 3 What is artificial classification?
7 Answer 3 Artificial classification is based on the characteristics that an organism has.
8 Question 4 What are the 7 groups of classification in order?
9 Answer 4 Kingdom, Phylum, Class, Order, Family, Genus, Species
10 Question 5 What are the 5 different kingdoms?
11 Answer 5 Animal, plant, fungus, protocista, prokaryotes
12 Question 6 What is the difference between a vertebrate and an invertebrate?
13 Answer 6 Vertebrates have a backbone/ spinal cord
14 Question 7 What is an arthropod? What are the 4 groups of arthropod?
15 Answer 7 Invertebrates with jointed legs, segmented body with exoskeleton. Insects Arachnids Crustaceans Myriapods
16 Question 8 What are the characteristics of the each of the four arthropod groups?
17 Answer 8 Insects- 6 legs Arachnids body sections and 8 legs Crustaceans- 2 body sections and at least 10mlegs Myriapods- 2 body sections and lots of legs
18 Question 9 What is variation?
19 Answer 9 Differences within a species
20 Question 10 Why do we classify organisms?
21 Answer 10 It shows evolutionary and ecological relationships
22 Question 11 What is a species?
23 Answer 11 A group of animals that can reproduce together to make fertile offspring
24 Question 12 Why is it difficult to classify some organisms?
25 Answer 12 Animals at different stages of evolution and some have unusual characteristics. Some organisms have characteristics that put them in more than one group.
26 Question 13 What is a hybrid?
27 Answer 13 An infertile offspring made when two different species breed eg a zorse a hybrid of a horse and zebra.
28 Question 14 What is meant by a trophic level?
29 Answer 14 A feeding level in a food chain.
30 Question 15 What is a producer?
31 Answer 15 An organism that can make its own food using sunlight
32 Question 16 What is a consumer? What are the different types of consumer?
33 Answer 16 An organism that gets its energy from eating food. Primary, secondary, tertiary
34 Question 17 Where does all energy that supplies a food chain come from originally?
35 Answer 17 The Sun
36 Question 18 What does a food chain show?
37 Answer 18 The flow of energy in an ecosystem
38 Question 19 What does a biomass pyramid show?
39 Answer 19 The amount of living matter in each trophic level
40 Question 20 Why are there problems in constructing food pyramids?
41 Answer 20 Producers are very large and parasites may be on a large animal
42 Question 21 What is an omnivore?
43 Answer 21 An animal that eats both plants and other animals
44 Question 22 Name 3 reasons why energy gets lost as you go up the food chain
45 Answer 22 Used in movement, through heat from respiration and egestion/ excretion
46 Question 23 What is a herbivore and what is a carnivore?
47 Answer 23 Herbivore- animal that eats plants Carnivore- animal that eats other animals
48 Question 24 What happens to the energy level as you go up the food pyramid?
49 Answer 24 It decreases as some is lost at each level.
50 Question 25 How does energy enter the food chain?
51 Answer 25 Through producers who make it from the Sun s light energy.
52 Question 26 What happens when animals and plants die?
53 Answer 26 They decay (by decomposers)
54 Question 27 What are decomposers? Give 2 examples
55 Answer 27 Organisms that break down plants and animals. Fungi and bacteria
56 Question 28 Why is decay important?
57 Answer 28 Elements are recycled and used by other organisms for growth.
58 Question 29 How does sustainable development protect endangered species?
59 Answer 29 Managing a resource so it does not run out
60 Question 30 What are the 2 most important elements for plants and animals?
61 Answer 30 Nitrogen and carbon
62 Question 31 How does carbon and nitrogen get into plants?
63 Answer 31 Carbon- through carbon dioxide in the air. Nitrogen from the soil as nitrates
64 Question 32 How much nitrogen is there in the air? (As a percentage)
65 Answer 32 78%
66 Question 33 Why can animals and plants not use nitrogen gas directly?
67 Answer 33 Nitrogen is unreactive and does not combine well with other elements
68 Question 34 What does nitrifying bacteria do?
69 Answer 34 Converts ammonia into nitrates
70 Question 35 What does denitrifying bacteria do?
71 Answer 35 Breaks down nitrates into nitrogen gas which is released into the atmosphere
72 Question 36 What does nitrogen fixing bacteria do?
73 Answer 36 Converts nitrogen gas into nitrates or ammonia
74 Question 37 Why does recycling of nutrients take longer in waterlogged or acidic soils?
75 Answer 37 Lack of oxygen prohibits the bacteria involved in recycling, from respiring.
76 Question 38 Name 3 ways carbon dioxide is released into the air?
77 Answer 38 Respiration, decomposers, burning fuels
78 Question 39 Name 1 way carbon dioxide is removed from the atmosphere.
79 Answer 39 By plants and trees photosynthesising.
80 Question 40 What form of nitrogen can plants take in?
81 Answer 40 Nitrates
82 Question 41 What is a predator and what is a prey?
83 Answer 41 A predator is something that eats animals. The prey is the animal that is hunted and eaten.
84 Question 42 What happens to the number of predators if the number of prey decreases?
85 Answer 42 It will start to decrease as well
86 Question 43 What 4 things could influence the population of a plant/ animal
87 Answer 43 Competition, disease, climate change, number of predators.
88 Question 44 What is mutualism?
89 Answer 44 Where two organisms benefit from a relationship.
90 Question 45 Give an example of mutualism
91 Answer 45 Oxpecker and buffalo. Oxpecker eats insects that live on the buffalo
92 Question 46 Why do organisms within a species compete with each other?
93 Answer 46 Because there are limited resources. The organisms have to compete to get the resources so that they survive.
94 Question 47 What does the term ecological niche mean?
95 Answer 47 The role of an organism within an ecosystem
96 Question 48 What is parasitism?
97 Answer 48 An organism that lives in or on the body of another organism
98 Question 49 What does interspecific and intraspecific mean?
99 Answer 49 Interspecific = competition between 2 different species. Intraspecific = competition within the same species
100 Question 50 Why are nitrogen fixing bacteria in the root nodules of leguminous plants classed as a mutualistic relationship
101 Answer 50 The bacteria provides the plants with nitrates and proteins The plant provides the bacteria with glucose Both organisms benefit.
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