biology paper 1 part 2

Question 1

food test and results

Answer 1

starch: turns iodine from orange to black

sugars: turns benedict’s blue to orange

protein: turns biuret’s blue to purple

lipids: turns cold ethanol cloudy

Question 2

circulatory system + functions

Answer 2

artery: carry blood away from heart

vein: carry blood to the heart

capillary: allow fast diffusion between blood and cells

Question 3

what is the difference between communicable and non communicable diseases

Answer 3

communicable: caused by pathogen

non communicable: cause comes from inside the body

Question 4

what does xylem and phloem do

Answer 4

xylem: carry water + mineral ions

phloem: transport sugars + other nutrients

Question 5

how do gasses enter and exit the leaf?

Answer 5

through holes in the lower epidermis (stomata)

Question 6

what is meiosis
(simplified)

Answer 6

cell division that reduces the number of chromosomes in the parent cell by half and produces 4 gamete cells

Question 7

what is the independent variable

Answer 7

deliberately changed to observe its effects on another variable

Question 8

what is the dependent variable

Answer 8

measured / observed during an experiment

Question 9

what is the control variable

Answer 9

deliberately kept the same

Question 10

how to remember variable

Answer 10

Dairy Milk Ice Cream

dependent- measure
independent- change
control- keep the same