review 1(single award)

Question 1

Name the organ that the Zika virus passes across to get from the mother to the developing fetus (line 9).

Answer 1

. placenta; 


Question 2

Explain how vaccinating a woman could prevent her baby being born with microcephaly.

Answer 2

1. harmless virus / weakened virus 

   
   2. secondary immune response; 

   3. memory cells; 

   4. antibodies produced more / faster / sooner / eq; 

   5. destroy virus / destroy pathogen;

Question 3

Suggest how the release of sterile male mosquitoes could reduce the spread of disease

Answer 3

1. males do not produce sperm 
 1. no fertilization

Question 4

Describe a method the student could use to obtain a valid comparison of the number of insects in each wheat field.

Answer 4

1. several samples / repeat;
2. random;
3. method of randomization;
4. sample at same depth of soil;
5. sample at same time (of year / day / season);
2. same stage of wheat growth / same variety of wheat / same species of wheat;

Question 5

. Explain the biological reasons for including oils and fats only in small amounts.

Answer 5

1. obesity / overweight / eq;
2. (fat / cholesterol) build up in arteries / block arteries;
3. lead to CHD / high blood pressure / stroke / diabetes / eq;

Question 6

Suggest why carbohydrates such as bread should be wholegrain if possible. 


Answer 6

1. contains fibre / roughage;
2. aid peristalsis / movement through gut / prevent constipation;

Question 7

. Explain why is it especially important for pregnant women to include milk and dairy products in their diet.

Answer 7

1. calcium / vitamin D; 2. bones / skeleton;

Question 8

Explain what is meant by the term balanced diet.

Answer 8

1. correct proportion / correct amount / suitable amount / sufficient amount / eq;
2. carbohydrate, protein, lipid, vitamins, minerals, fibre and (water)