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(i)Contraction of external intercostal muscles;and relaxation of internal intercostal muscles move the ribs outwards and upwards;resulting in an increase in volume of thoracic cavity.
(ii)Relaxation of external intercostal muscles and contraction of intercostal muscles move ribs downwards and inwards;bringing a decrease in volume of thoracic cavity.
Belan answered the question on February 23, 2019 at 08:35
- Explain the terms:
(i)Natural immunity.
(ii)Artificial immunity.(Solved)
Explain the terms:
(i)Natural immunity.
(ii)Artificial immunity.
Date posted: February 22, 2019. Answers (1)
- Name three plant tissues that are involved in support.(Solved)
Name three plant tissues that are involved in support.
Date posted: February 22, 2019. Answers (1)
- State the number of chromosomes found in human somatic cell.(Solved)
State the number of chromosomes found in human somatic cell.
Date posted: February 22, 2019. Answers (1)
- Name three main parts of an animal cell as seen under a light microscope.(Solved)
Name three main parts of an animal cell as seen under a light microscope.
Date posted: February 22, 2019. Answers (1)
- What is:
(i)Ichthyology.
(ii)Entomology.
(iii)Cytology.(Solved)
What is:
(i)Ichthyology.
(ii)Entomology.
(iii)Cytology.
Date posted: February 22, 2019. Answers (1)
- On a hot day the testis hang loosely in the scrotal sac while on a cold day they are held next to the body .Explain...(Solved)
On a hot day the testis hang loosely in the scrotal sac while on a cold day they are held next to the body. Explain the importance of this behaviour to humans.
Date posted: February 22, 2019. Answers (1)
- (A)How is mitochondria adapted to its function?
(B)(i)State which of the following organs has the highest number of mitochondria per cell;liver,kidney,stomach.
(ii)Give a reason for your answer...(Solved)
(A)How is mitochondria adapted to its function?
(B)(i)State which of the following organs has the highest number of mitochondria per cell: liver,kidney,stomach.
(ii)Give your answers in b(i)above.
Date posted: February 22, 2019. Answers (1)
- Distinguish between excretion and egestion(Solved)
Distinguish between excretion and egestion.
Date posted: February 22, 2019. Answers (1)
- State how the gills of a bony fish are structurally adapted for gaseous exchange.(Solved)
State how the gills of a bony fish are structurally adapted for gaseous exchange.
Date posted: February 22, 2019. Answers (1)
- What are the differences between blood in the pulmonary artery and that in pulmonary vein?(Solved)
What are the differences between blood in the pulmonary artery and pulmonary vein?
Date posted: February 22, 2019. Answers (1)
- (A)(i)Give one difference between proteins and lipids.
(ii)What common role do the two compounds play in the cell?
(B)State two ways in which the external structure of...(Solved)
(A)(i)Give one difference between proteins and lipids.
(ii)What common role do the two compounds play in the cell?
(B)State two ways in which the external structure of a leaf is adapted for photosynthesis.
Date posted: February 22, 2019. Answers (1)
- A certain plant had broad and large leaves.While another had narrow needle like leaves.State the natural habitat of each of the plants.
(i)Broad,large leaves.....
(ii)Narrow needle-like leaves....(Solved)
A certain plant had broad and large leaves. While another had narrow needle like leaves. State the natural habitat of each of the plants.
(i)Broad,large leaves....
(ii)Narrow needle-like leaves....
Date posted: February 22, 2019. Answers (1)
- The scientific name for housefly is Musca domestica.
(i)State the name of the genus of the housefly.
(ii)State the system that has been used in naming the...(Solved)
The scientific name for housefly is Musca domestica.
(i)State the name of the genus of the housefly.
(ii)State the system that has been used in naming the housefly.
Date posted: February 22, 2019. Answers (1)
- State the function of each of the following parts of a light microscope:
(i)Mirror
(ii)Eye piece lens
(iii)Fine adjustment knob(Solved)
State the function of each of the following parts of a light microscope:
(i)Mirror
(ii)Eye piece lens
(iii)Fine adjustment knob
Date posted: February 22, 2019. Answers (1)
- (A)State the importance of each of the following to the life of organisms:
(i)Respiration
(ii)Excretion(Solved)
(A)State the importance of each of the following to the life of organisms:
(i)Respiration
(ii)Excretion
Date posted: February 22, 2019. Answers (1)
- Explain the three types of protozoans found in the soil habitat.(Solved)
Explain the three types of protozoans found in the soil habitat.
Date posted: February 19, 2019. Answers (1)
- Outline four biological importance of mycorrhizal associations in an ecosystem(Solved)
Outline four biological importance of mycorrhizal associations in an ecosystem.
Date posted: February 19, 2019. Answers (1)
- Explain why amoeba absorbs excess water and it does not burst, while a animal cell burst when it absorbs excess water(Solved)
Explain why amoeba absorbs excess water and it does not burst, while a animal cell burst when it absorbs excess water.
Date posted: February 19, 2019. Answers (1)
- Explain the defensive behavior of termites. (Solved)
Explain the defensive behavior of termites.
Date posted: February 18, 2019. Answers (1)
- Discuss parasitic nematodes under the following subheadings:
a)Excretory system.
b)Body plan.
c)Digestive system.
d)Nematodes musculature.(Solved)
Discuss parasitic nematodes under the following subheadings:
a)Excretory system.
b)Body plan.
c)Digestive system.
d)Nematodes musculature.
Date posted: February 18, 2019. Answers (1)