Biology 1

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  • Created by: catrin15
  • Created on: 28-05-15 09:33
Assuming no difference in taste why might people prefer free-range to battery hens?
They might object to the conditions that battery chickens were kept in and so not want to buy the product
1 of 19
Suggest two reasons why battery eggs are cheaper than free-range eggs
Costs can be reduced because less land is need. Less food is required because the chickens don't move around/use much energy
2 of 19
State two advantages of using systemic pesticides, rather than spraying chemicals
The pesticide won't drift on the wind to other areas. Only organisms that eat the crop will get the pesticide/it won't kill harmless insects
3 of 19
Suggest one possible disadvantage of using systemic pesticides
It could remain in the plant and get into humans when they eat the crop.
4 of 19
Give two examples of plant material which can decay in a compost heap
leaves, grass, twigs
5 of 19
Give the name for decayed plant waste
Compost
6 of 19
Why is the decayed plant waste spread on the garden?
To improve the soil
7 of 19
Name one type of microbe that causes decay
Bacteria/fungi
8 of 19
Name the gas which microbes need for respiration
Oxygen
9 of 19
Suggest one reason why some people, who have never been charged with an offence, object to their DNA samples being kept on record.
Reference to ownership of DNA/worries about insurance companies/employers having access/invasion of privacy/infringement of human rights
10 of 19
Suggest one advantage of the police keeping a DNA database
Allows police to identify people/suspects who have committed a crime/identify a dead body
11 of 19
Explain why genetic profiling can provide evidence in more cases than normal fingerprinting can
Only very small samples of DNA are required. It is harder for criminals to avoid leaving DNA at the scene than to avoid leaving finger prints/DNA is more likely to be found than fingerprints
12 of 19
state one reason why meiosis takes place when gametes are produced
reference to gametes producing correct number of chromosomes in fertilised egg/need 23 in egg and 23 in sperm to get 46 in embryo
13 of 19
Explain why roughly equal numbers of boy and girl babies are born
Half of sperm cells contain X chromosomes and half have Y chromosomes. These types of sperm have an equal chance of fertilising an egg. There is a 50:50 chance of getting a boy or a girl.
14 of 19
Suggest a possible reason for the slightly higher number of boys
The difference is just due to chance
15 of 19
Explain the meaning of the term 'genetic modification' (GM)
Transfer of genes/DNA from one species/type of organism to another
16 of 19
Give one example of a GM that is carried out on a crop plant
herbicide/weed killer/pesticide resistant gene in soya; disease resistance in potatoes; tomatoes remaining fresher longer; or any other correct example.
17 of 19
state the advantage of Genetic Modification on a crop plant
When the crop is sprayed with herbicide, the soya is unaffected/ reference to increased yield/financial advantage/advantage to the environment/**** seed oil modified to produce fish oils.
18 of 19
Suggest one scientific reason why some people are concerned about the genetic modification of plants and animals.
concerns about health/creating a pest species/genes escaping to create weeds/super weeds/the long-term effects are not known/genes escaping into the wild or organic crop population or words to that effect.
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Other cards in this set

Card 2

Front

Suggest two reasons why battery eggs are cheaper than free-range eggs

Back

Costs can be reduced because less land is need. Less food is required because the chickens don't move around/use much energy

Card 3

Front

State two advantages of using systemic pesticides, rather than spraying chemicals

Back

Preview of the front of card 3

Card 4

Front

Suggest one possible disadvantage of using systemic pesticides

Back

Preview of the front of card 4

Card 5

Front

Give two examples of plant material which can decay in a compost heap

Back

Preview of the front of card 5
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