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year 10 Science Homework Week 6
By Naomi Arthur
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Last updated over 4 years ago
12 questions
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Question 12
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Diffusion is the…
Movement of particles from an area of low concentration to an area of low concentration
Movement of particles from an area of high concentration to an area of low concentration
Movement of particles between high and low concentration areas
Oxygen diffuse from the alveoli to the blood because…
There is a high concentration of oxygen in the alveoli and a low concentration in the blood
There is a low concentration of oxygen in the alveoli and a high concentration in the blood
The alveoli are adapted for this
Food that has been broken down diffuses from the small intestines to the blood stream because …
There is a high concentration of food molecules in the blood and a low concentration in the small intestines
There is a low concentration of food molecules in the blood and a high concentration in the small intestines
The holes in the wall of the small intestine are the correct size
Diffusion occurs quickest when…
The temperature is uniform
The surface area is small
The concentration gradient is large
Diffusion occurs quickest when…
The temperature is high
The temperature is low
The temperature is 37-40oC
Which adaptation of the alveoli increase the surface area to volume ratio?
Alveoli are moist
Alveoli are spherical
Alveoli have walls that are one cell thick
How is the small intestine adapted to increase the surface area to volume ratio?
Lined with lots of villi that are small with long finger-like structures
Lined with lots of villi that are small and spherical
Lined with lots of tubules that are small with long finger-like structures
Which adaptation of the root hair cell increases its surface area to volume ratio?
No chloroplasts
Very thin cell wall
Long protruding finger-like structure
Why do one-cell thick walls increase the rate of diffusion?
Particles have a shorter distance to travel
The surface area to volume ratio is high
In maintains a high concentration gradient
Why do one-cell thick walls increase the rate of diffusion?
Particles have a shorter distance to travel
The surface area to volume ratio is high
In maintains a high concentration gradient
Why does a good blood supply increase the rate of diffusion?
Particles have a shorter distance to travel
The surface area to volume ratio is high
In maintains a high concentration gradient
Why do the shape of the alveoli, villi and amoeba mean they are adapted for efficient diffusion?
Particles have a shorter distance to travel
The surface area to volume ratio is high
In maintains a high concentration gradient