Year 9 Term 2

Question 1

What are the adaptations of a leaf of a plant for gas exchange?

Answer 1

Air spaces of spongy mesophyll(large surface area), thin tissues within the leaf stomata(short diffusion distance, carbon dioxide used immediately by photosynthesis cells(concentration gradient)

Question 2

What are the adaptations of alveoli of the lungs

Answer 2

Large surface area,short diffusion distance,concentration gradient

Question 3

Describe what happens in carbon dioxide practicle

Answer 3

It is used to compare the amount of co2 inhaled and exhaled, as you breath in the atmosphe air gets sucked in and as you breath out the exhaled air goes down and into the other tube, the exhaled air turns cloudy showing there is more co2

Question 4

Describe what happens when you breath in

Answer 4

Diaphragm contracts and shortened becoming flattened,the intercostal muscles contract,rib cage moves up and out,volume in the lungs increase, pressure in the lungs decreases, air is inhaled, moving from high to low pressure

Question 5

Describe what happens when you breath out

Answer 5

Diaphragm relaxes, moving up and returning to its dome shape, intercoastal muscles relax , rib cage moves down and in , the volume in the lungs decrease, pressure in the lungs increases,air is exhaled moving from low to high pressure

Question 6

Describe what happens in the lime water practicle with yeast

Answer 6

As the yeast is deprived of oxygen the yeast respires anarobicaly so the lime water then turns cloudy as more co2 is released

Question 7

What is the word equation of anaerobic respiration in yeast

Answer 7

Glucose-> ethanol + carbon dioxide

Question 8

What is the word equation for anaerobic respiration in exercise

Answer 8

Glucose-> energy+lactic acid

Question 9

What is the balanced equation for aerobic respiration

Answer 9

C6H12O6 + 6O2 → 6CO2 + 6H2O

Question 10

What happened when you smoke and get damages cilia

Answer 10

The mucus is not swept away from the lungs causing the passages to be blocked

Question 11

What happens if you have irritations in the airways

Answer 11

You can get infections and can cause lung disease bronchitis

Question 12

What is emphysema

Answer 12

There is a lot less surface area of lungs of an emphysema sufferer the symptoms are unable to exercise and when the alveoli are damaged by smoke the walls break down and fuse toghether

Question 13

Carbon monoxide interferes with the bloods ability to transport oxygen around the body explain how

Answer 13

The carbon monoxide can combine with haemoglobin much more tightly than oxygen can then forming a compound called carboxyhaemoglobin therefore the blockage carries a lot less oxygen

Question 14

What are the different levels of organisation within organisms

Answer 14

Organelles, cells, tissues, oreganos and organ systems