I want to light a bunsen on safety flame. What position should the "hole" be?
The hole should be open to increase air flow
The hole should be closed to decrease air flow
The hole should be in the half way position
Which of the following are organs?
Neurone
Stomach
Eye
Muscle
Which features will you only find in plant cells?
Chloroplasts
Nucleus
Ribosomes
Cellulose Cell Wall
Which features will you find in a bacterial cell?
Circular DNA
RIbosomes
Mitochondria
What is the role of the mitochondria
To produce energy for the cell
To release energy from food molecules
Performs aerobic respiration to produce ATP for energy
How many micrometers are in a meter?
1000
100
1000,000
10,000
I measured the size of a root hair cell under the microscope. It was 4cm. My magnification was 400x. How big is the actual root hair cell?
10mm
0.1mm
1000 um
100um
The red blood cell is an example of a specialised animal cell. How is specialised to carry oxygen to respiring tissues?
Large surface area to volume ratio because of its biconcave shape
No organelles so it can carry lots of haemoglobin
Red in colour to increase the rate of diffusion
Small and flexible to fit into the smallest capillaries
The root hair cells of plants are specialised cells. Which of the following describes their adaptation to function?
Long and thin to help absorb water from between fine soil particles
Large surface area to volume ratio to increase rate of diffusion of water into the cell
Have stomata which open and close to control movement of gases in and out
Define diffusion
Random movement of molecules from a low to a high concentration
Random movement of molecules from a high to low concentration
Random movement of molecules against a concentration gradient
How does oxygen get into a cell?
It diffuses across the cell membrane
The cell breathes it in from the atmosphere
It moves by osmosis across the cell membrane
Which of the following allows diffusion to happen more quickly?
A large diffusion distance
A good blood supply
A steep concentration gradient
A large surface area
WHen I breathe out which of the following happens?
The diaphragm contracts and moves down
The intercostal muscles contract
The rib cage moves down and in
The volume of the lung space increases
The pressure in the lung space increases compared to outside
