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WorksheetsTheory Worksheet 10.1
Total questions: 40
Worksheet time: 3hrs 46mins
What can be inferred from Hakim's observation of the change in water levels?
Sugar molecules passed through the partially permeable membrane to the right side of the container.
Sugar molecules passed through the partially permeable membrane to the left side of the container.
Water molecules passed through the partially permeable membrane to the right side of the container.
Water molecules passed through the partially permeable membrane to the left side of the container.
What would be observed if Hakim added four spoonfuls of salt to the right side of the container?
There would be no change in the water level on both sides.
Only the water level on the right side would rise.
Only the water level on the left side would rise.
The water level on both sides would rise.
A class experiment required Marie to stand at the back of the classroom. Her teacher, who stood at the front of the room, opened a bottle of perfume. After some time, Marie could smell the perfume. Identify the process that occurred in this experiment.
Diffusion of perfume particles from a region of higher concentration to a region of lower concentration
Diffusion of perfume particles from a region of lower concentration to a region of higher concentration
Osmosis of perfume particles from a region of higher concentration to a region of lower concentration
Osmosis of perfume particles from a region of lower concentration to a region of higher concentration
Caroline removed the roots of a woody plant. Then, she soaked the plant stem into a container filled with mineral salt solution. She placed the plant under the sun for a few days. She was trying to find out if...
a woody plant can survive without any food
a plant can survive without water
a plant can survive without its roots
a woody plant can survive without sunlight
A scientist was investigating the feeding habits of an insect. After further observation, she discovered that the insect feeds on a sugary substance from a part within a plant stem. What is the likely part that the insect feeds on?
Phloem
Root Hair
Stoma
Xylem
When Rina exercised and used up more energy, she observed that her heart beat faster than usual. Which of the following statements explains this observation?
Rina’s heart was not pumping efficiently.
Rina’s body lacks essential nutrients.
Rina does not have enough red blood cells in her body.
Rina’s body requires more oxygen when she exercises.
Choose all the options that make up the answer to:
"Why do humans need an efficient transport system to transport substances (oxygen, nutrients and waste substances) around their body?"
Humans are multicellular organisms with a low surface area to volume ratio.
Humans are mammals with a lot of hair and distinguishing features.
Each cell in the human body needs oxygen and nutrients to survive and function properly.
There must be an efficient transport system to transport these necessary materials from the entry at the mouth to each cell.
An efficient transport system is also needed to quickly remove waste substances from each cell.
Nathan was planning an experiment to test if plants could live in an environment with high oxygen concentration. What are some possible questions Nathan could ask regarding his control set-up for the experiment?
What are the fixed variables that must be kept the same between the variable and control set-ups?
What state should the control set-up plants be in?
Does the species of the plant matter?
Do the plants photosynthesise efficiently and produce a lot of oxygen?
Is the location of the control set-up artistically pleasing?
The vacuole of a root hair cell...
...has a high concentration of mineral salts
...has an average concentration of mineral salts
...has a low concentration of mineral salts
...has no mineral salts at all
Water molecules move from cell to cell through...
Diffusion
Osmosis
What do plants obtain from the soil out of the following?
Sunlight
Carbohydrates
Water
Mineral Salts
Enzymes
Mineral salts move from cell to cell through...
Diffusion
Osmosis
Oxygen molecules move from cell to cell through...
Diffusion
Osmosis
Carbon dioxide molecules move from cell to cell through...
Diffusion
Osmosis
Water molecules move from burst cell to burst cell through...
Diffusion
Osmosis
Which of the following option(s) make up the circulatory system?
Heart
Stomach
Blood Vessels
Blood
Bone Marrow
Which of the following are type(s) of blood vessels?
Tear Ducts
Arteries
Capillaries
Veins
Urethra
What are the components of blood?
Plasma
Platelets
Red Blood Cells
White Blood Cells
Pus
How is diffusion involved in the human transport system?
Exchange of oxygen and carbon dioxide between the blood and the lungs
Exchange of nutrients and waste substances between the body cells and the blood plasma
Movement of water in and out of the body cells
Movement of saliva into the mouth
How is diffusion involved in the plant transport system?
Movement of carbon dioxide into the plants and oxygen out of the plants through the stomata during photosynthesis
Conversion of simple carbohydrates into complex carbohydrates in the leaf cells
Movement of water in and out of the human body cells
Movement of mineral salts from one cell to another
How is osmosis involved in the human and plant transport systems?
Movement of water in and out of the human body cells
Movement of water in and out of the plant cells
Movement of water in and out of the mouth
Movement of water along the blood vessels
Identify what Isaac was trying to find out.
How the texture of a potato strip is affected when a potato strip is immersed in solutions of different water potentials
How the length of a potato strip is affected when a potato strip is immersed in solutions of different photosynthetic capabilities
How the texture of a potato strip is affected when a potato strip is immersed in solutions of different concentrations of cooking oil
How the length of a potato strip is affected when a potato strip is immersed in solutions of different water potentials
What was the most likely combination of strips and types of solutions?
A with distilled water, B with concentrated salt solution, C with dilute salt solution
A with concentrated salt solution, B with dilute salt solution, C with distilled water
A with dilute salt solution, B with distilled water, C with concentrated salt solution
Choose possible reasons for why Isaac used strips instead of chunks of potato.
Strips have a better shape for osmosis to occur, and will result in clearer results.
Strips have a larger surface-area-to-volume ratio for osmosis to occur, and will result in clearer results.
The results are easier to measure in potato strips because they are long.
Potato strips remind us of french fries and so will make the experiment more enjoyable.
The results are easier to measure in regularly sized potato strips than in irregularly sized potato chunks.
Suggest how Isaac can improve the experiment to obtain more accurate results.
Isaac can measure the exact concentrations of the salt solutions he is using for the experiment.
Isaac can standardise the length, width, and height of the potato strips at the start of the experiment, instead of just the length.
Isaac can use more (e.g. three) potato strips for each type of solution, and then take the average change in length for all the potato strips in each solution.
Isaac can increase the number of salt solutions he is using, so that he is not just testing three solutions.
Choose all the options that make up the answer to:
"Explain why adding salt can reduce the amount of water in meat."
Due to the difference in water potentials, salt will enter the meat cells through osmosis.
Salt creates an environment with lower water potential than the meat cells.
Salt creates an environment with an equivalent water potential to the meat cells.
Due to the difference in water potentials, water molecules will leave the meat cells through osmosis.
There will be a net loss of water from the meat cells then.
Choose all the options that make up the answer to:
"With your knowledge of osmosis, explain how fungal growth is slowed down in salted meat but not in raw unsalted meat."
The cells of salted meat have a low amount of water molecules due to salting, as compared to unsalted meat which has more water.
The cells of salted meat will have a lower water potential than fungal cells.
Water will leave the fungal cells and enter the meat cells through osmosis due to the difference in water potentials.
The fungal cells will not be able to survive losing water and thus will not grow.
However, raw unsalted meat can act as a source of water for the fungal cells, allowing them to grow.
What are acceptable answers for the question "Briefly describe a real-life situation that shows diffusion of gases."?
When insecticide is sprayed at one end of a room, a person on the opposite end will be able to smell it within minutes. After some time, the smell of the insecticide will fill the whole room.
When two coloured solutions are poured into the same containers, the colours eventually mix and the whole solution is the same colour.
When deodorant is sprayed at one side of a classroom, a person on the opposite side will be able to smell it within minutes. After some time, the smell of the deodorant will fill the classroom.
When cleaning the room with a vacuum cleaner, all the dust on the floor will flow down the concentration gradient into the vacuum cleaner.
Choose all the options that make up the answer to:
"How does diffusion happen in gases and liquids?"
In gases and liquids, the molecules are always moving around randomly.
While moving around in a region of higher concentration, the molecules are less likely to collide with each other than in a region of lower concentration.
While moving around in a region of higher concentration, the molecules are more likely to collide with each other than in a region of lower concentration.
These collisions will cause the molecules to end up changing their path of movement, leading to them moving towards the region of lower concentration.
There will then be a net movement of molecules down the concentration gradient to the region of lower concentration.
What is the BEST answer to the question "Besides obstructing blood flow, how does the shape of the sickle cells affect their function?"
Sickle cells have a smaller surface area compared to regular white blood cells. This means that sickle cells are unable to take in or release oxygen at the normal rate.
Sickle cells have a smaller surface area compared to regular red blood cells. This means that sickle cells are unable to take in or release oxygen at the normal rate.
Sickle cells have a smaller surface area to volume ratio compared to regular red blood cells. This means that sickle cells are unable to take in or release oxygen at the normal rate.
Sickle cells have a smaller surface area to volume ratio compared to regular red blood cells. This means that sickle cells are unable to take in or release oxygen.
What is/are ACCEPTABLE answer(s) to the question "Alan has a very mild case of sickle-cell anaemia. He believes that blood transfusion would cure this disorder. Is this true? Explain your answer."
Yes, it is a permanent solution. This is because the healthy person's red blood cells will teach Alan's body how to produce healthy red blood cells forever.
No, it is only a temporary solution. This is because blood transfusion provides only a healthy person’s blood to Alan, but doesn't change what blood cells Alan's body will produce.
Yes, it is a permanent solution. This is because the healthy person's red blood cells will replace all of Alan's sickle cells, and he will only have healthy red blood cells.
No, it is only a temporary solution. This is because the healthy person's red blood cells have no nucleus, and will thus die out and be replaced by Alan's new sickle cells.
The doctor advised Alan not to donate blood. What are the questions you need to ask to determine the other activities that Alan should avoid?
What are the effects of having sickle cells?
What activities require a high usage of oxygen by the body?
What activities increase the risk of blood clots?
Does this disorder require constant monitoring?
Does this disorder require any equipment with specific restrictions?
What is/are ACCEPTABLE answer(s) to the question "Explain why a lung infection can cause someone to feel faint."
Their lungs would carry out gaseous exchange super efficiently, resulting in too much oxygen being delivered to the brain and causing the feeling faint.
Their lungs might be unable to carry out gaseous exchange efficiently due to the dysfunctional lung tissue, leading to less oxygen being delivered to all the body cells and the brain.
The infection in the lungs might cause so much pain that the person starts having a stroke and feels faint
The infection in the lungs might cause a blockage of red blood cells, white blood cells, and platelets, preventing any exchange of oxygen and carbon dioxide
What is the BEST answer to the question "Suggest a reason for a patient's heart to beat abnormally fast in response to a lung infection."
The heart is beating faster in order to make up for a reduced rate of gaseous exchange, as this will suck in more oxygen into the body at a faster rate.
The heart is beating faster in order to make up for a reduced rate of gaseous exchange, through increasing the volume of blood that is involved at any one unit of time.
The heart is beating faster in order to push white blood cells to the site of the infection, so that the immune system can fix the infection faster
The heart is beating faster in order to push platelets to the site of the infection, so that the platelets can form a barrier and prevent the infection from spreading.
What is/are ACCEPTABLE answers to "Predict if a blood transfusion would eliminate the symptoms of a lung infection on the body (e.g. feeling faint, increased heart rate). Explain your answer."
A blood transfusion would completely eliminate the symptoms as it is not good enough to deal with all the problems.
A blood transfusion would completely eliminate the symptoms as the blood would be able to transport a lot of oxygen to all the body cells.
A blood transfusion would improve the symptoms as the blood would be able to transport more oxygen, but the lungs would not be fixed.
A blood transfusion would help the situation by increasing the amount of oxygen that could be transported, but the lung infection would still need to be cured in order for the symptoms to be eliminated.
Which section of the stem was stained red?
A
B
X
Y
What is part X?
Bark
Phloem
Cortex
Xylem
What is part Y?
Bark
Phloem
Pith
Xylem
What substance(s) can be found in Y? Choose all acceptable answers, even if they mean the same thing.
Water
Sugars
Food
Mineral Salts
What substance(s) can be found in X? Choose all acceptable answers, even if they mean the same thing.
Water
Sugars
Food
Mineral Salts
