Fossil records /paleontology
Fossils are remains of organisms that became preserved in naturally occurring materials many years ago; They show morphological charges of organisms over a long period of time
Callparative anatomy;
Organisms have common embryonic origin; but structures become modified differently to perform different functions; those are called homologous structures other have different embryous origin but structures become modified and adapt in the same environments thus perform similar functions such structures are called analogous structures; others have become reduced in size dug to disuse in the environment; these are called vestigial structures
Geographical distribution
Presents continents are thought to have been one large land mess (pangea); as a result of continental drift; isolation occurred bringing about different patterns of evolution; of related organisms e.g. llamcis in the amazon resemble the camel;
Acc ;Jaguars ,panthecs with their counter parts.
marto answered the question on October 9, 2019 at 08:03
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State the possible application of the following plants hormones in agriculture
(i) Auxins
(ii) Gibberellins
(Solved)
State the possible application of the following plants hormones in agriculture
(i) Auxins
(ii) Gibberellins
Date posted:
October 9, 2019
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Answers (1)
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The table below shows how the width of the stomata and the wind speed can affect the rate of transpiration from a leaf of a...
(Solved)
The table below shows how the width of the stomata and the wind speed can affect the rate of transpiration from a leaf of a plant. The width are measured in micrometers (nm)
a)plot a graph of rate of transpiration against width of the stomata.
(b) Use your graph to predict the rate of transpiration when the stomata have a width of 8nm.
(c) Describe the relationship between the width of stomata and the rate of transpiration in still air.
(d) Explain why the rate of transpiration in wind differs from rate in still air.
(e) Explain why transpiration is important in plants.
Date posted:
October 9, 2019
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Answers (1)
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The diagram below represents a transverse section through mammalian skin.
(Solved)
The diagram below represents a transverse section through mammalian skin.
(a) Name the structures A and B .
A
B
(b) (i) Explain how the hair in human beings helps in keeping the body warm .
(ii) Explain other methods by which the skin helps to keep the body warm.
Date posted:
October 9, 2019
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Answers (1)
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The following is a diagrammatic representation of a dissection of a rabbit showing the urinogenital system.
(Solved)
The following is a diagrammatic representation of a dissection of a rabbit showing the urinogenital system.
a)name the structures labeled P, Q, S and T. For each of the structures, state one function.
b)
i) Identify the sex of the rabbit that was dissected
ii) Give two reasons for your answer in b(i) above
c) Name the instrument labeled x in the diagram above
Date posted:
October 8, 2019
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Answers (1)
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Name one human disease caused by each of the following parasites.
(a) Plasmodium falciparum
(b) Entamoeba histolytica
(Solved)
Name one human disease caused by each of the following parasites.
(a) Plasmodium falciparum
(b) Entamoeba histolytica
Date posted:
October 8, 2019
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Answers (1)
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Below are diagrams of disease causing micro-organisms. Use them to answer the questions that follow.
(Solved)
Below are diagrams of disease causing micro-organisms. Use them to answer the questions that follow.
(a) State the kingdom to which they are found
(b) Name the diseases caused by the organisms: A and B
(c) State one way in which the disease named for organism B can be prevented
Date posted:
October 8, 2019
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Answers (1)
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Study the diagram below and answer the questions which follow.
(Solved)
Study the diagram below and answer the questions which follow.
i) Identify the muscle represented by X and Y
ii) Describe how muscles x and y cause straightening of the joint z
iii) Name the joint z
Date posted:
October 8, 2019
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Answers (1)
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The diagram below represents a bone obtained form a mammal.
(Solved)
The diagram below represents a bone obtained form a mammal.
(a) Identify the bone
(b) Name the structures labeled X and W
(c) Name the bone that articulate with structure labeled Z
Date posted:
October 8, 2019
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Answers (1)
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The diagram below represents a bone obtained from a mammalian skeleton.
(Solved)
The diagram below represents a bone obtained from a mammalian skeleton.
(a) Identify the bone
(b) Name the:
(i) Bone it articulates with at point A
(ii) Type of joint that forms at point B in articulation with other bones
Date posted:
October 8, 2019
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Answers (1)
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The diagram below represents the anterior view of a rib.
(Solved)
The diagram below represents the anterior view of a rib.
Date posted:
October 8, 2019
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Answers (1)
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Give three importance of mammalian skeleton.
(Solved)
Give three importance of mammalian skeleton.
Date posted:
October 8, 2019
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Answers (1)
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How does vascular bundles contribute to support in plants?
(Solved)
How does vascular bundles contribute to support in plants?
Date posted:
October 8, 2019
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Answers (1)
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State the role of lignin in the wall of the xylem vessel.
(Solved)
State the role of lignin in the wall of the xylem vessel.
Date posted:
October 8, 2019
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Answers (1)
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State three types of skeleton found in Kingdom animalia.
(Solved)
State three types of skeleton found in Kingdom animalia.
Date posted:
October 8, 2019
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Answers (1)
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The diagram below represents a mammalian bone.
(Solved)
The diagram below represents a mammalian bone.
(a) Identify the bone shown above.
(b) State the function of the parts labelled R and S.
(c) State the region of the body in which the bone is found.
Date posted:
October 8, 2019
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Answers (1)
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The diagram below represents a bone in the mammalian skeleton.
(Solved)
The diagram below represents a bone in the mammalian skeleton.
a) Identify the bone with a reason.
b) State the function of the part labeled D.
Date posted:
October 8, 2019
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Answers (1)
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A person had an accident and had problems with his vision, hearing and memory.Identify the part of the brain that was affected
(Solved)
A person had an accident and had problems with his vision, hearing and memory.
Identify the part of the brain that was affected
Date posted:
October 7, 2019
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Answers (1)
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State two functions of vitamin B5 (pantothenic acid).
(Solved)
State two functions of vitamin B5 (pantothenic acid).
Date posted:
October 7, 2019
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Answers (1)
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a)State two functions of a mammalian ear.
(b) How is the cochlea suited to its function.
(Solved)
a)State two functions of a mammalian ear.
(b) How is the cochlea suited to its function.
Date posted:
October 7, 2019
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Answers (1)
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The diagram below represents a simple reflex arc.
(Solved)
The diagram below represents a simple reflex arc.
(a) Name the parts labeled A and B
(b) Explain how an impulse is transmitted across the gap labeled C
Date posted:
October 7, 2019
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Answers (1)