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B7: Quiz 11 – Answers
B7: Quiz 11 – Answers
1)
a) Biodiversity is the variety of different species of organisms on earth or within an ecosystem
b) Any 2 from:
2) The two reasons are:
3) Any 2 from habitat destruction, hunting, air pollution, land pollution, water pollution etc.
4) Any 1 from forests being deforested, peatbogs being drained/ burnt, wetlands being drained, bushland/ grassland being cleared etc.
5)
a) The overfishing of a particular fish causes the population of that particular fish to decrease. All of the organisms in an ecosystem are interdependent, which means that a decrease in the population of the fish that is being overfished will affect the populations of all of the other organisms in the ecosystem
b) Either for fun, trophy hunting or for the materials that the animals have (the tusks of elephants or the horns of rhinos)
6) Any 2 from:
7) The 3 benefits of recycling are:
8) Any 2 from:
a) Biodiversity is the variety of different species of organisms on earth or within an ecosystem
b) Any 2 from:
- We obtain lots of resources from the earth
- Biodiversity is important for food security
- Ecosystems give us clean air and clean water
- The plants in ecosystems provide us with substances that we can use in drugs to treat diseases
- Ethical reasons – should we allow ourselves to completely destroy the planet?
- Nature gives us many mental health benefits/ inspiration/ creativity
2) The two reasons are:
- Population growth
- Economic growth means that individuals/ countries are becoming wealthier and are purchasing more goods/ requiring more resources
3) Any 2 from habitat destruction, hunting, air pollution, land pollution, water pollution etc.
4) Any 1 from forests being deforested, peatbogs being drained/ burnt, wetlands being drained, bushland/ grassland being cleared etc.
5)
a) The overfishing of a particular fish causes the population of that particular fish to decrease. All of the organisms in an ecosystem are interdependent, which means that a decrease in the population of the fish that is being overfished will affect the populations of all of the other organisms in the ecosystem
b) Either for fun, trophy hunting or for the materials that the animals have (the tusks of elephants or the horns of rhinos)
6) Any 2 from:
- Enhanced greenhouse effect/ climate change – caused by carbon dioxide, methane etc.
- Acid rain – caused by sulfur dioxide and nitrogen oxides
- Global dimming – caused by particulates
7) The 3 benefits of recycling are:
- Less waste goes to landfill so less land is needed for landfill/ needs to be cleared for landfill
- Fewer new resources are needed, which keeps the raw materials in the ground for future generations. This also means that less land is cleared to obtain these new resources
- Recycling materials saves energy as less energy is required to recycle materials compared to using new materials. This can reduce greenhouse gas emissions if the energy is obtained from fossil fuels
8) Any 2 from:
- Sewage that has not properly been treated is released into rivers and lakes
- Chemicals that farmers use on their land can wash off of fields into rivers and lakes when it rains. These chemicals are fertilisers, pesticides and herbicides
- Plastic waste enters lakes or rivers
Questions
1)
a) Define biodiversity.
b) Give 2 reasons why biodiversity is important.
2) Give the two reasons why humans are using more resources.
3) Without looking at the questions below, give 2 ways that humans are decreasing biodiversity.
4) Give an example of a habitat that is being cleared.
5)
a) Why does the overfishing of one type of fish affect the whole ecosystem?
b) Some animals are hunted for food – for example, we hunt fish to eat. Give another reason why some animals are hunted?
6) Human activity can release many gases and substances into the atmosphere. Give 2 effects that these gases/ substances cause and name the gases/ substances.
7) Give the 3 benefits of recycling.
8) Give 2 different ways that rivers and lakes can be polluted.
1)
a) Define biodiversity.
b) Give 2 reasons why biodiversity is important.
2) Give the two reasons why humans are using more resources.
3) Without looking at the questions below, give 2 ways that humans are decreasing biodiversity.
4) Give an example of a habitat that is being cleared.
5)
a) Why does the overfishing of one type of fish affect the whole ecosystem?
b) Some animals are hunted for food – for example, we hunt fish to eat. Give another reason why some animals are hunted?
6) Human activity can release many gases and substances into the atmosphere. Give 2 effects that these gases/ substances cause and name the gases/ substances.
7) Give the 3 benefits of recycling.
8) Give 2 different ways that rivers and lakes can be polluted.