7. AQA GCSE Biology: Ecology Questions with complete solution 2024
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7. AQA GCSE Biology: Ecology Questions with complete solution 2024 Ecosystem - correct answer The interaction of a community of living organisms with the non-living parts of their environment
What is a community made up of? - correct answer The populations of different species or organisms t...
7. AQA GCSE Biology: Ecology
Ecosystem - correct answer ✔The interaction of a community of living
organisms with the non-living parts of their environment
What is a community made up of? - correct answer ✔The populations of
different species or organisms that are all interdependent in a habitat
Habitat - correct answer ✔The environment in which an organism lives
Population - correct answer ✔The total number of organisms of the same
species living in the same geographical area
Interdependence - correct answer ✔The way in which each species within a
community depends on other species for food, shelter, pollination, seed
dispersal etc
Competition - correct answer ✔The process by which living organisms
compete with each other for limited resources (such as food, light or
reproductive partners)
What do organisms require to survive and reproduce? - correct answer ✔A
supply of materials from their surroundings and from the other living
organisms there
What do plants often compete with each other for? (4) - correct answer
✔Light, space, water, and mineral ions from the soil
,What do animals compete with each other for? (3) - correct answer ✔Food,
mates and territory
Stable community - correct answer ✔Where all the species and
environmental factors are in balance so that population sizes remain fairly
constant
What happens if one species is removed from a community? - correct answer
✔It can affect the whole community
Name 7 abiotic factors and how they might affect a community - correct
answer ✔Litmuswoc
1. Light intensity - photosynthesis, breeding cycles linked to day length
2. Temperature - photosynthesis/plant growth, therefore animals which can
survive
3. Moisture levels - both plants and animals need water to survuve
4. Soil pH and mineral content - distribution of plants, most struggle to grow
where there is few mineral ions; low pH inhibits decay and therefore release of
mineral ions
5. Wind intensity and direction - shape of trees and landscape, increases plant
transpiration
6. Availability of oxygen - aquatic animals e.g. fish require high levels of
dissolved oxygen
7. Availability of carbon dioxide - photosynthesis
, Name 4 biotic factors and how they might affect a community - correct
answer ✔FPOP
1. Availability of food - food allows animals to survive and breed successfully
2. New predators arriving - organisms with no defences against these
predators may die out
3. One species outcompeting another so the numbers are no longer sufficient
to breed - e.g. grey squirrels in Britain
4. New pathogens - organisms have no resistance so populations can be
wiped out
Adaptations - correct answer ✔Features which enable an organism to
survive in the conditions in which they normally live
Adaptations may be... - correct answer ✔...structural, functional or
behavioural
Examples of structural adaptations (4) - correct answer ✔Features of body
structure, shape or colour - e.g. animals living in cold environments have
small ears (low SA:vol ratio), Arctic foxes have white fur, whales have blubber,
herbivores have teeth for grinding up plant cells
Examples of behavioural adaptations (3) - correct answer ✔Basking,
migration, tool use - e.g. reptiles bask to absorb energy from the sun and
warm up, birds migrate, nocturnal to avoid heat of day
Examples of functional adaptations (3) - correct answer ✔Processes inside
body like metabolism and reproduction - e.g. delayed implantation of embryos,
reduced sweating, organisms in extreme winter temperatures produce a
chemical in cells which acts as an antifreeze
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