WA1 Practice Paper: Infectious Diseases and Flowering Plants — question paper

Section A: Multiple-choice questions[10 marks]

Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer.

1. 1

   Influenza is caused by

   1. Aa bacterium
   2. Ba virus
   3. Ca toxin
   4. Dinsulin resistance
   ( )
2. 2

   Which disease is NOT infectious?

   1. Ainfluenza
   2. Bpneumococcal pneumonia
   3. Ctype 2 diabetes
   4. Dthe common cold
   ( )
3. 3

   Antibiotics are ineffective against influenza because

   1. Athe dose is too small
   2. Binfluenza is viral and antibiotics attack bacterial structures
   3. Cviruses are stronger than bacteria
   4. Dantibiotics only work in hospitals
   ( )
4. 4

   A vaccine protects by

   1. Akilling pathogens directly
   2. Bstimulating white blood cells to produce antibodies quickly on real infection
   3. Ccoating the airways
   4. Draising body temperature permanently
   ( )
5. 5

   Most chloroplasts in a leaf are found in the

   1. Aupper epidermis
   2. Blower epidermis
   3. Cpalisade mesophyll
   4. Dair spaces
   ( )
6. 6

   Xylem transports

   1. Asucrose in both directions
   2. Bwater and dissolved mineral salts upwards
   3. Coxygen downwards
   4. Dstarch sideways
   ( )
7. 7

   Carbon dioxide reaches mesophyll cells by

   1. Adiffusing through stomata into the leaf air spaces
   2. Btravelling up the phloem
   3. Cpumping by guard cells
   4. Ddissolving in the cuticle
   ( )
8. 8

   Which condition slows transpiration?

   1. Awindy air
   2. Bdry air
   3. Chigh humidity
   4. Dbright light
   ( )
9. 9

   Translocation is the transport of

   1. Awater in the xylem
   2. Bfood (mainly sucrose) in the phloem
   3. Cwater vapour out of stomata
   4. Dmineral salts into root hairs
   ( )
10. 10

    Moving a lamp from 20 cm to 10 cm from pondweed makes the bubble count

    1. Afall to a quarter
    2. Bhalve
    3. Cdouble
    4. Drise to about four times
    ( )

Section B: Structured questions[30 marks]

Answer all questions in the spaces provided.

1. 1

   A new influenza vaccine is offered before the flu season.

   1. (a)

      State what the vaccine contains.

      [1]
   2. (b)

      Describe how vaccination protects a person who later meets the real virus.

      [4]
   3. (c)

      State two other measures that reduce flu transmission in a school, naming the route each blocks.

      [4]
2. 2

   A leaf is cut in transverse section and examined.

   1. (a)

      Name the layer with most chloroplasts and explain why its position suits the job.

      [2]
   2. (b)

      Name the structures that open and close to let gases in and out, and state where most are found.

      [2]
   3. (c)

      State the position of xylem and phloem in a stem vascular bundle and what each carries.

      [3]
   4. (d)

      Explain how a root hair cell is suited to absorbing water from the soil.

      [3]
3. 3

   Pondweed releases oxygen bubbles under a lamp at different distances.

   Results

   Distance / cm	Bubbles per minute
   10	40
   20	10
   40	3

   1. (a)

      State the effect of lamp distance on the rate of photosynthesis.

      [2]
   2. (b)

      The distance doubled from 10 cm to 20 cm but the rate fell to a quarter. Explain this with the inverse-square relationship.

      [3]
   3. (c)

      Define transpiration and name the structures through which water vapour escapes.

      [2]
   4. (d)

      A fan blowing over the shoot increases transpiration. Explain why, and name the process that pulls water up the stem as a result.

      [4]