Classification Part 3

Question 1

Intraspecific variation

Answer 1

Variation within species

Question 2

Interspecific variation

Answer 2

Variation between species

Question 3

Continuous variation

Answer 3

Two extremes and full range of intermediate values

Histogram

Question 4

Discontinuous variation

Answer 4

Distinct categories with no intermediate values

• gender
• blood Grp
• flagella?

Question 5

Causes variation

Answer 5

Genetic variation

Environmental variation

Question 6

Adaptation

Answer 6

A characteristic that enhances a species chance of survival in the habitat

Question 7

Adaptations are either

Answer 7

Anatomical (structural features)
Behavioural
Physiological (processes and biochemistry)

Question 8

Anatomical adaptations marram grass

Answer 8

Long roots - reach water deep underground
Leaves curled - reduces surface area exposed to wind and traps at against lower The dermis so moisture can build up an enclosed space
Leaves covered in thick waxy cuticle - reduces evaporation of water from the cells of leavf

Question 9

Behaviour Adaptation of Marram grass

Answer 9

Rolling leaf more tightly and closing stomata

When marram got covered in sand grow more quickly to reach sunlight

Question 10

Physiological/biochemical adaptations marram

Answer 10

Guard cells work in a similar way to open and close stomata
Marholm is not very salt tolerant but it maintains a cell water potential vets now up and any other plants to enable it to live in salty conditions

Question 11

Natural selection

Answer 11

• mutation creates alternative version of gene
• Intraspecific variation
• selection pressure
• individuals with advantageous characteristics survive
• pass on advantageous characteristics (inheritance)
• adaptation

Question 12

Resistance

Answer 12

Insects and pesticides

Bacteria and autobiotics