1a) Parts of the lung.
A: Trachea, bronchi, bronchioles
1b)How can a lung be described as a tree? A:Branches out smaller and smaller
1c)How do the lungs move when a person breathes in?
A: Intercostal & diaphram contact, pressure lower
1d)Why is smoking banned in public buildings?
A: Enclosed space, lots of people, emphysema, cancer, CO, tar
1e)Why are children harmed more by smoke?
A: More fragile, less developed lungs easily damaged
2a) Table about visking tubing.
A: Example: No No
Starch+Maltase: No No
Starch+Glucose: No Yes
Starch+boiled amylase:No No
2b) How does the volume change?
2c)Test for glucose?
A: Benedicts solution dark to brick red
d)How would you use this equipment for bile/lipids?
A: Place in visking tube Test water for glycerol/fatty acids
a) Genetic tree questions.
3b) Define ‘mutation’.
A:Change in the genetic code
3c)Example of good mutation.
A : Antibiotic resistance, giraffe long neck etc
3d) How would the frequency of alleles change if medical care was not avaliable?
A: Would decrease; people with the fatal allele would die before they can reproduce without medical help, and wouldnt pass on allele
4a) Does the father determine gender?
A: Yes, father has XY, mother has XX Y decides whether child is boy or girl
4b)Man A vs B.
A: More sperm, healthier sperm
4c)Smokers and non smokers graph.
A: 45% of 55m=24750000
4d)Why are smokers less fertile, using the graph?
A: Have less moving sperm, more mutated sperm
5a) Balanced photosynthesis equation.
A: 6H20 + 6CO2 > C6H12O6 +6O2
5b)Why are the leaves darker?
A: More chlorophyll so they can absorb more sunlight
5c)Why are the leaves thinner?
A: So light can penetrate to other layers of leaves
5d&e)Morning vs night; effect on rate of photosynthesis.
A: Morning = colder, less light, slower
A: Opposite for afternoon
5f) Describe a test to compare the rate of photosynthesis for 2 plants.
A: Measure amount of O2 produced by 2 different types of pondweed with gas syringe
6a) What is used?
6b) Frequency of plants.
6c) Number of squares plants are in.
6d) How would you calculate the average for a very large field?
A: Use lots of quadrats
Find average of plantains
Multiply by area of field
7a) Young plants in mineral solutions: describe pattern in both plants.
A: In all minerals solution the plant grew to 163mm Plants without nitrate grew to 37-38mm and began to shrink
7b)Why was air bubbled through?
A: More oxygen, more respiration respiration, more energy for active transport
7c)Why was it covered with cardboard?
A: Mimic underground conditions
7d) Why was the solution sterile?
A: So no microorganisms outcompeted the plants
8a) Draw a graph generation/cloning.
A: More older people supported cloning
8c)Using a named example, explain cloning.
A: Dolly the sheep, mature udder cell into enucleated cell, implanted into uterus of another sheep
9a) Label motor neurone.
A: nucleus, axon
9b)Describe role in the body.
A: Connects relay neurone to muscle/effector
9c) 3 Differences in hormonal and nervous?
Small area/big area
10) Fill in blanks: Chloroplasts, cellulose, starch, glycogen, consumer, chromosome, plasmid, photosynthesis, yoghurt, pneumonia
11a) How do fungi digest logs?
A: Saprotrophic nutrition: secrete enzymes and absorb
11b) Design experiment to find best fungicide. (CORMS)
A: Take 50 logs
Same weight, surface area, species
Split into 5 groups
Treat 4 groups with different fungicides, leave 10 as a control
Leave all logs on forest floor: same conditions Wash to remove fungi
Weigh and average groups to find loss in mass from each fungicide
Turn on thread page Beta
Edexcel iGCSE Biology 1B 16th May 2017 Unofficial Markscheme watch
- Thread Starter
- 17-05-2017 09:49
- 17-05-2017 10:31
- 18-05-2017 19:58
Could you add how many marks was each question worth
- 18-05-2017 20:33
Legend, thanks for this