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Which of the following correctly describes the transpiration process?
1. water evaporates into the air spaces of the leaf
2. water molecules cohere so are pulled upwards in the xylem
3. water passes by osmosi through the stomata
4. water vapour diffuses through the mesophyll cells
1 and 2
2 and 4
1,3 and 4
Why does chewing food help digestion?
the food is easier to swallow
the food has a better taste
the food has increased surface area
the food is soter
What does the yeast gain from fermentation?
carbon dioxide for respiration
energy for growth
ethanol for growt
glucose for repiration
Which blood vessel carries blood with the lowest concentration of urea?
hepatic portal vein
Which processes can take place in a root hair cell when oxygen is not available?
active transport only
active transport and osmosis
osmosis and diffusion
What is an example of active transprt?
movement of ions up the xylem
movement of water into root hairs
uptake of glucose by cells of villi
uptake of oxygen by red blood cell
The small intestine contains a low concentration of glucose produced from the digestion of starch. Glucose is taken up by the cells of the villi. How does the glucose move?
by active transport against the conc. gradien
by active transport with the conc. gradient
by diffusion against the conc. gradient
by diffusion with the conc. gradint
Plants use carbon dioxide and water to carry out photosynthesis. Which description is correct?
CO2 and water enter the roots and move through the xylem to each leaf.
CO2 and H2O enter a leaf thrugh stomata and diffue into leaf cells.
COs enters a leaf through stomata and H2O enters a leaf from the xylem
CO2 enters a leaf through stomata an water enters a leaf form the phloem.
Chemicals in tobacco smoke lead to the breakdown of the elastic tissue in the alveoli. What is the name of this condition?
What is the role of cilia in the gaseous exhange syse?
they increase the surface area for gas exchange
the move air down the trachea
the move mucus up the trachea
they trap dust and bacteria
A food gives the following results on testing.
- a purple colour in the biuret test
- a blue colour when heated with Benedict's solution
- a yellow colour with iodine
- a white emulsion with ethanol
What nutrient does the food contain?
fat and protein
protein and reducing sugar
reducing sugar and stach
starch and fat
The statements are about how liver deals with excess glucose.
1. it is converted toamino acids
2. it is converted to fats
3. it is deaminated to produce urea
4. it is stored sgycogen
Which statemens are correct?
1 and 2 only
1,2 and 3
2 and 4
What cases the symptom of bronchitis?
breakdown of alveolar walls
inflamation of airway walls
narrowing of pulmonary ateries
uncontrolled division of lung cells
Which property of water is essental for blood to be pumped by the human heart?
it has high specific heat capacity
it is an excellent solvent
it is most dense at +4oC
it is inompressible.
Which of the following subsances in cigarettes causes blood to clot easily?
Which of the following cells can photosynthesizes?
upper epidermal cells
lower epirdermal cells
How is carbon monoxide in tobacco smoke harmful?
it causes emphysema
it causes lung cancer
it combines with haemoglobin
it kills the cells lining the trachea
A person's diet contains more protein than is needed for growth and repair. This causes increased production of ...
What is the purpose of deamination?
to oxidise proteins for energy
to produce urea
to remove excess amino acids
to make new amino acids
An experiment was performed on a young plant using an aphid stylet to measure the rate of transport in the phloem. The same pant was then placed in a bell jar and a chemical placed in the bell jar to absrob all the oxygen present. The rate of transport in the phloem decreased and then stopped.
What is the reason for this?
companion cellsno longer produce suffient energy
mitochondrion in the xylem vessels cease to function
photosynthesis cannot occur inthe bell jar
translocation occurs only by diffusion
The coronary arteries carry blood to the ___
walls of alveolus
Which of the following is correct about the substrate and enyme?
substrate - lock and enzyme - key
substrate - key and enzyme - lock
substrate - product and enzyme - key
substrate - lock and enzyme - product
In the small intestine, a is the main function of the villi?
to cause food to be swept along more swiftly
to cause more efficient absorption of digested food
to remove water from undigested food
to secrete enzymes
Which conditions cause the fastest rate of transpiration?
dry and cold
dry and warm
wet and cold
wet and warm
The cell sap of a root hair cell has a higher concentration of nitrates than the surrounding soil. Which feature of the cell stops these nitrates moving back from teh cell to the soil?
large surface area
water potential gradiet
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