Bio Paper 3 - 25/05

Question 1

Structures inside cell nucleus that contain DNA

Answer 1

chromosomes

Question 2

What type of substances are C, G, T & A in DNA

Answer 2

Bases

Question 3

When someone’s face goes red when exercising, what is happening internally

Answer 3

Blood vessels dilating

Question 4

Process of microorganisms recycling chemicals in dead plants and then how chemicals are used again by living plants

Answer 4

• Micro organisms digest the dead plants, respiration produces carbon dioxide.
• Breaks down molecules into mineral ions (nitrates/phosphates/magnesium)
• Plants use CO2 through leaves by diffusion - using it for photosynthesis, producing glucose.
• Roots take in mineral ions from soil for making amino acids/ proteins for chlorophyll e.g.

Question 5

How should you place quadrats

Answer 5

Random coordinates

Question 6

what is a reflex action

Answer 6

automatic / non conscious reaction

Question 7

SIX stages of someone moving their hand away from a hot object

Answer 7

• Receptor in skin detects stimulus of heat
• Impulse sent via neurones
• Impulse sent to sensory, to relay to motor neurone
• Go through synapses.
• CNS sends signal for muscle contraction
• Muscle contracts

Question 8

THREE ways in which endocrine system differs in coordination from nervous system

Answer 8

• longer lasting
• slower
• chemical via blood rather than electrical impulse via neurones

Question 9

How do hormones control the menstrual cycle? FIVE STAGES

Answer 9

FOLP & OP

FSH - Stimulates growth and maturation of egg
OESTROGEN - stops the production of FSH and stimulates release of LH
LH - releases the egg
PROGESTERONE - stops production of LH & FSH
O & P - maintain lining of the uterus

Question 10

How do algae get energy if not consuming organisms

Answer 10

Light absorbed by chlorophyll

Question 11

Major reasons for inequality in Birmingham

Answer 11

DEINDUSTRIALISATION - Job loss, less income from tax for local authorities - less spend on education etc.

In-migration of wealthy foreigners has increased incomes in some parts, whereas other areas of social housing have seen decline

Question 12

Define the term ‘urbanisation’

Answer 12

Increase in the population living in towns/cities.

Question 13

Reason for deindustrialisation in UK cities

Answer 13

Globalisation
Cheaper imports from elsewhere