BIO 1Br June 2020

Question 1

What vacuole do

Answer 1

Contains cell saps

Question 2

What cytoplasm do

Answer 2

Where chemicals reactions occur such as protein synthesis and respiration

Question 3

Why PALISADE MESOPHYLL contains chloroplast

Answer 3

absorb light for photosynthesis

Question 4

Why PALISADE MESOPHYLL has large surface area

Answer 4

Absorb most light

Question 5

why palisade mesophyll has large vacuole

Answer 5

To store water

Question 6

Function of insulin

Answer 6

control blood sugar level

Question 7

(FERMENTER) What is it cleaned with

Answer 7

steam

Question 8

(FERMENTER) use of paddles

Answer 8

distributes contents

Question 9

(FERMENTER) Name of gas bubbled into it

Answer 9

Oxygen

Question 10

(FERMENTER) function of cooling jacket

Answer 10

To control temperature

Question 11

What happen to diaphragm and external intercostal muscles
when breathe in

Answer 11

both contract

Question 12

Why theres more blood flow at legs when running

Answer 12

-There is more blood to muscles
- blood supply oxygen
- for respiration
-muscle contraction

Question 13

Why we continue to breathes faster and deeper after we stop running

Answer 13

-Supply more oxygen
-Repay oxygen debt
- Remove lactic acid

Question 14

Example of term decrbing trophic level

Answer 14

producer,consumer,etc..

Question 15

Suggest why there were more mice in year 4 than in the other years.

Answer 15

• warmer weather
• Less disease
• Conc of food increase
• Owl feeds on other animals

Question 16

Suggest why the number of owls was fairly constant each year

Answer 16

-Feed on other prey
- insufficient food
- no predators
- owls produce little offspring

Question 17

Suggest a method you would use to estimate the number of mice in the woodland.

Answer 17

• place quadrat at random
• count of mice in quadrat
• calculate average
• repeat

Question 18

Explain how some molecules in blood allow active transport to occur in cells of fetus

Answer 18

• Oxygen is used or respiration
• produces glucose and energy

Question 19

) Explain how one type of molecule from the mother helps to protect the fetus
from infection.

Answer 19

• Mother gives antibodies
• Antibodies binds to antigens
• to kill bacteria

Question 20

The student’s method LACKS DETAILS.

Rewrite the method so that the student could make a valid conclusion about the
effect of temperature on amylase.

Answer 20

• same Conc of amylase
• same mass of bread
• range of temp
• same Conc of benedict
• repeat

Question 21

) The student predicted that the rate of digestion of starch would keep increasing
as temperature increased.
Comment on this prediction.

Answer 21

• increased in KE
• More collisions
• until optimum temp
• rate decrease at high temp
• because enzyme denature

Question 22

Suggest why using e‑cigarettes may be thought to be less harmful than
smoking normal cigarettes

Answer 22

• less tar
• less risk of cancer
• less CO
• less Rick of heart disease

Question 23

Suggest why many doctors are concerned about promoting the use of
e‑cigarettes to young people.

Answer 23

• non smokers may start using e cig
• As addictive as normal cig due to nicotine
• Nicotine increase risk of blood clot
• e cig can damage lungs

Question 24

Why fertilisers may decrease O2 Conc in a river

Answer 24

• Fertilisers washed into rivers
• Eutrophication
• Algae decomposed and bacteria reproduce (a lot)
• Bacteria need oxygen to respire

OR
- Dead algae
- block sunlight from entering
- Plants cannot absorb sunlight to photosynthesise
- Less photosynthesis = less O2

Question 25

How fertilisers can increase crop yield

Answer 25

Nitrates:
growth/amino/protein

Mg:
more photosynthesis = more glucose

Phosphates:
More DNA

Potassium:
control of water movement