1720361
Questão 1
Questão
I want to light a bunsen on safety flame. What position should the "hole" be?
Responda
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The hole should be open to increase air flow
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The hole should be closed to decrease air flow
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The hole should be in the half way position
Questão 2
Questão
Which of the following are organs?
Responda
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Neurone
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Stomach
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Eye
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Muscle
Questão 3
Questão
Which features will you only find in plant cells?
Responda
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Chloroplasts
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Nucleus
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Ribosomes
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Cellulose Cell Wall
Questão 4
Questão
Which features will you find in a bacterial cell?
Responda
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Nucleus
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Circular DNA
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RIbosomes
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Mitochondria
Questão 5
Questão
What is the role of the mitochondria
Responda
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To produce energy for the cell
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To release energy from food molecules
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Performs aerobic respiration to produce ATP for energy
Questão 6
Questão
How many micrometers are in a meter?
Responda
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1000
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100
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1000,000
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10,000
Questão 7
Questão
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?
Responda
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10mm
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0.1mm
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1000 um
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100um
Questão 8
Questão
The red blood cell is an example of a specialised animal cell. How is specialised to carry oxygen to respiring tissues?
Responda
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Large surface area to volume ratio because of its biconcave shape
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No organelles so it can carry lots of haemoglobin
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Red in colour to increase the rate of diffusion
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Small and flexible to fit into the smallest capillaries
Questão 9
Questão
The root hair cells of plants are specialised cells. Which of the following describes their adaptation to function?
Responda
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Long and thin to help absorb water from between fine soil particles
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Large surface area to volume ratio to increase rate of diffusion of water into the cell
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Have stomata which open and close to control movement of gases in and out
Questão 10
Questão
Define diffusion
Responda
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Random movement of molecules from a low to a high concentration
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Random movement of molecules from a high to low concentration
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Random movement of molecules against a concentration gradient
Questão 11
Questão
How does oxygen get into a cell?
Responda
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It diffuses across the cell membrane
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The cell breathes it in from the atmosphere
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It moves by osmosis across the cell membrane
Questão 12
Questão
Which of the following allows diffusion to happen more quickly?
Responda
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A large diffusion distance
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A good blood supply
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A steep concentration gradient
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A large surface area
Questão 13
Questão
WHen I breathe out which of the following happens?
Responda
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The diaphragm contracts and moves down
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The intercostal muscles contract
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The rib cage moves down and in
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The volume of the lung space increases
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The pressure in the lung space increases compared to outside
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