Biology Chapter 8 Human Activity on Earth

Question 1

What type of reaction is photosynthesis

Answer 1

Endothermic

Question 2

What is the word equation for photosynthesis

Answer 2

Carbon Dioxide + Water—–> Glucose + Oxygen

Question 3

What 2 things are needed to allow photosynthesis to happen

Answer 3

Light
Chlorophyll

Question 4

Where are chlorophyll found and what colour are they

Answer 4

Found in chloroplast
Green

Question 5

Testing the leaf for starch - what is the indicator used and what is the result of presence of starch

Answer 5

Iodine
Turns yellow brown to blue black

Question 6

Why is the plant destarched before placing under light

Answer 6

To remove any starch
so any starch formed is due to experiment set up

Question 7

If leaf was part white and part green (variegated) what would you expect the result to be if tested it for starch

Answer 7

The green parts go blue black as chlorophyll needed for photosynthesis
White parts stay yellow brown in iodine

Question 8

What is the source of energy for ecosystems

Answer 8

Sun

Question 9

What do the arrows in a food chain represent

Answer 9

Transfer of energy

Question 10

What does a food chain always start with

Answer 10

A producer (plant) as they make own food

Question 11

What is a consumer

Answer 11

An organism that gets energy from eating other things

Question 12

What is an abiotic factor

Answer 12

A non living factor
It will affect an environment eg temperature, water, oxygen availability

Question 13

What is a biotic factor

Answer 13

A living factor
This will affect organisms - eg predator or prey, grazers that eat grass

Question 14

How are lichen good indicators of air pollution

Answer 14

They are a biotic factor (a living organism)
They will die if levels of pollution in air increase so can be monitored to see how many of them there are

Question 15

What resources will plants compete for

Answer 15

Light, water, space, minerals in soil

Question 16

What resources will animals compete for

Answer 16

Water, food, territory, mate

Question 17

What is a competitive invasive species

Answer 17

A plant or animal that will invade a new area and out compete the natural species present
eg grey squirrels were introduced and were able to outcompete red squirrels as bigger and ate different foods so survived

Question 18

what is biodiversity

Answer 18

The number of different species of plants and animals found in an area

Question 19

How can agriculture (farming) have a positive impact on biodiversity

Answer 19

1 - replant hedges (more food and habitats for animals)
2 have margins at side of crop fields that are left to go wild - they attract different plants and therefore insects/animals
3 - use fertilizers efficiently - so certain plants do not outcompete other plants

Question 20

How can land use management have a positive impact on biodiversity

Answer 20

use brown field (have had building) or industrial land to build housing on rather than using green fields

Question 21

How can fishing have a positive impact on biodiversity

Answer 21

• protect fish stocks by setting quotas on number of fish allowed to be caught
• have net size bigger so smaller fish can pass through (they can then grow to maturity and reproduce so keep population)
• ban fishing of certain fish species (that are at risk of extinction)

Question 22

How can nature reserves have a positive impact on biodiversity

Answer 22

nature reserve eg peatlands park, bog meadows in belfast
They preserve habitats that are at risk of becoming extinct - therefore provide correct environment for survival of certain plants or animals

Question 23

Role of international treaties

Answer 23

To agree how to reduce global warming

Question 24

Give two features that all competitive invasive species have in common.

Answer 24

• spread rapidly when introduced into a region
• outcompete native species
• they are almost always introduced to a country by humans