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Sec 4 Express Sci Bio TYS MCQ 2020 Set B
Quiz by HAO YI
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Root hair cells have extensions as shown.
What is the purpose of the extensions?
They make the cells thin for sugar and ion uptake.
They increase surface area for water and ion uptake.
They make the cells thin for water and sugar uptake.
They increase surface area for water and sugar intake.
A partially permeable membrane is filled with starch suspension and placed in a beaker containing iodine in potassium iodide solution.
After 10 minutes the colour of that liquid inside the partially permeable membrane turns blue-black.
The liquid in the beaker remains light brown.
Which statement explains these results?
Starch moves by osmosis through the membrane.
Iodine moves by osmosis through the membrane.
Starch diffuses through the membrane.
Iodine diffuses through the membrane.
Root hair cells have extensions as shown.
What is the purpose of the extensions?
A partially permeable membrane is filled with starch suspension and placed in a beaker containing iodine in potassium iodide solution.
After 10 minutes the colour of that liquid inside the partially permeable membrane turns blue-black.
The liquid in the beaker remains light brown.
Which statement explains these results?
Large molecules are synthesised from smaller basic units.
What are the basic units of proteins?
A scientist has a sample of food and wants to be able to extract amino acids, fatty acids and glycerol from it.
Which combination of digestive enzymes should be used?
The alimentary canal and some associated organs are shown.
What are organs 1, 2 and 3?
Which structures are linked by the hepatic portal vein?
Which word equation represents photosynthesis?
The diagram shows an image of a cross-section of a leaf, as seen through a light microscope.
Which letter shows the part that is responsible for the transport of water?
Which graph shows how the rate of transpiration from the leaves of a plant varies with light intensity?
The cross-sections of three blood vessels, X, Y and Z are shown.
Which row correctly identifies X, Y and Z?
Which component of the blood causes clotting?
Which pathway shows the movement of oxygen from the air into the blood?
A person touches a hot pan. He quickly and automatically moves his hand away from the pan.
Neurone F was accidentally cut at point X.
What effect would this have if he now touches the hot pan?
Fertilisation and early development in humans is shown.
Which word describes Q?
What controls the production of one polypeptide?
In cats, long hair is recessive to short hair.
Two heterozygous short haired cats were mated and produced a little of four kittens.
What is the probability of the kittens having long hair?
How many chromosomes are found in the nucleus of a body cell of a person with Down's syndrome?
A food web is shown. The grass in this food web is the producer.
Which row shows a correct food chain from this food web?
Which method would be the most effective at conserving fish stocks?
