3.4.1 - 3.4.4 Homeostasis, Plant Exchange, Breathing System FMQuiz HW Solution
Q. What is homeostasis?
A. Maintaining a constant internal environment
Q. Name the process by which the gases move in or
out of the leaf.
A. Diffusion
Q. Note one reason why homeostasis is important
in the human body.
A. Allows normal metabolic activities or Keeps
temperature suitable for enzyme reactions
Q. What is the function of the stomata of the leaf?
A. To allow exchange of gases; Transpiration
Q. Name the structures in plant cells in which
photosynthesis occurs.
A. Chloroplasts
Q. What is the function of cilia in the trachea?
A. Their motion carries trapped dirt particles and
bacteria upwards to the glottis
Q. In the spongy mesophyll, gases can diffuse
throughout the leaf. Name one such gas.
A. Air; Water vapour; O; CO2; N2
Q. Tiny holes called ... allow gases to enter and
leave the leaf.
A. Stomata
Q. Name a gas that leaves the leaf at the stoma(ta).
A. Oxygen; Water vapour; Carbon dioxide; Nitrogen
Q. How do the lungs contribute to homeostasis?
A. Excretion of water or CO2; Release of heat
Q. How do the nephrons of the kidneys contribute
to homeostasis?
A. Excretion or reabsorption of water; Excretion of
salts; Reabsorption of salts
Q. How are alveoli adapted for their purpose?
A. Capillary network; Moist surface; Thin walled;
Elastic wall; Large surface area; One cell thick
Q. Name a factor that influences the diameter of
the stoma(ta).
A. CO2; Light intensity; Potassium ions; Water
Q. Name the main gas transported in the
pulmonary vein.
A. Oxygen
Q. Give a function of the guard cell.
A. Controls stomatal size; Controls passage of gases
Q. How is oxygen transported in the blood?
A. By oxyhaemoglobin
Q. Where do cilia occur in the breathing system?
A. Trachea
Q. State the function of the larynx.
A. To make sound
Q. State precisely the events that take place in the
alveoli.
A. Exchange of gases – CO2 out, O2 in by diffusion
Q. Describe the role of the diaphragm in inhalation.
A. Contracts, lowers and increases volume of
thorax
Q. State the function of the epiglottis.
A. To close off trachea
Q. Name the process involved in the passage of gas
between the alveolus and the blood.
A. Diffusion
Q. How does the liver contribute to homeostasis?
A. Absorption or release of glucose; Heat
generation
Q. Name the apertures in stems that are equivalent
to stomata.
A. Lenticels
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