Test

Question 1

EXplain how the gas exchnage system for insects is adpated

Answer 1

Air moves through spiracles to the trachea to the tracheoles by diffusion
Tracheoles is highly branched so it provides a high surface area
Abdominal movemtns ventilate the organism
Air sacs store oxygen

Question 2

Why is turgor pressure generated?

Answer 2

Becasue water has moved into the cell by osmosis

Question 3

Explain why the plant tissue was left in sucrose solution for 10 minutes before
the cells were observed.

Answer 3

To allow time for water to move into the cells thus giving an accurate value of osmotic potential

Question 4

Explain how electrical events during the cardiac cycle can lead to an increase in
stroke volume.

Answer 4

MOre frequent impules from the SAN to the AVN to the bundle of HIS and then to teh Purkye tissues and therfore more ventricles contracting

Question 5

Explain why Olympic athletes who train for long distance events often have
low resting heart rates.

Answer 5

Due to thicker ventricle walls therfore stroke volume incraeses therfore same cariac output with fewer beats therfore sufficient supply of oxygen allowing respiration in cells

Question 6

Define plasmolysed

Answer 6

Water moves out of cell

Question 7

Reasons fagainst deforestation

Answer 7

The conervation of biodiversity is needed for clothig
Forests prvide homes
Deforestation casue global warming
Deforestation can cause flooding

Question 8

Reasons for deforestation

Answer 8

Forests have some economic implications 
Can be used for crop growth
Can provide wood
Can be used for homes
Results in reduction in biodiversity