a)
A – Gill filament
B – Gill bar
b)Traps solid particles in water which would otherwise pass over the surfaces of gill filaments and damage them mechanically / physically.
c)
(a) Moistened to facilitate diffusion of gases in solution form.
(b) Large and extensive to provide a large surface area for gaseous exchange.
marto answered the question on September 30, 2019 at 09:44
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Classify the following organisms into Phylum and Class.
(Solved)
Classify the following organisms into Phylum and Class.
Date posted:
September 30, 2019
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Answers (1)
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The table below shows how variation in environmental temperature relate to the body temperatures of two different types of animals A and B.
(Solved)
The table below shows how variation in environmental temperature relate to the body temperatures of two different types of animals A and B.
(a) Using the information in the table above, plot a graph on same axes of body temperatures animals against environmental temperature.
(b) With reference to thermoregulation, state the general name given to animals of the A and B types.
A - type animals
B - type animals
(c) What three advantages do B-type animals have over A-type animals?
(d) Briefly describe how B-type
i) Physiologically respond to heat
ii) Physiologically respond to cold
Date posted:
September 25, 2019
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Answers (1)
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The diagram below shows an experiment set up using a seedling enclosed in a desk box with a hole on one side at the beginning...
(Solved)
The diagram below shows an experiment set up using a seedling enclosed in a desk box with a hole on one side at the beginning of the experiment and after five days of growth.
(a) What type of response is shown by the above shoot?
(b) State two observable changes which took place in the seedling after five days of growth.
(c) Account for the observable changes in (b) above
(d) What observations would be made after five days of growth if the shoot was placed in a box without a hole on one side?
Date posted:
September 25, 2019
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Answers (1)
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The rates of gaseous exchange by different respiratory surfaces of plants were determined and recorded in the table below.
(Solved)
The rates of gaseous exchange by different respiratory surfaces of plants were determined and recorded in the table below.
Suggest the possible plant structure represented by A, B, C.
Date posted:
September 25, 2019
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Answers (1)
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The figure below shows a model which was used by a group of Form 2 students to show the effect of or action of intercostal...
(Solved)
The figure below shows a model which was used by a group of Form 2 students to show the effect of or action of intercostal muscles on the movement of ribs.
(a) How does the sternum move when;
(i) String A is pulled tight.
(ii) String B is pulled tight.
(b) Between string A and B, which one represents;
(i) External intercostal muscles?
(ii) Internal intercostal muscles?
(c) What does structure Q represent in an animal
Date posted:
September 25, 2019
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Answers (1)
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Broad and thin lips are inheritable characteristics in humans. When a homozygote broad lipped man is married to a homozygote thin lipped woman, all the...
(Solved)
Broad and thin lips are inheritable characteristics in humans. When a homozygote broad lipped man is married to a homozygote thin lipped woman, all the children in the family are broad lipped. In a particular family, a woman that is heterozygote for broad lips is married to a man whose parents were both thin lipped. Let B represent gene for broad lips.
(a) Work out the genotypes of the children in that family. (Use a punnet square
(b) Work out the phenotypic ratio and genotypic ratio of the resulting children from the crossing in (a) above
(c) Give two sex- linked traits in man.
Date posted:
September 25, 2019
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Answers (1)
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A pure Red flowered plant was crossed with a pure white flowered plant. All the F1 generation plants had pink flowers
(a) Give an explanation for...
(Solved)
A pure Red flowered plant was crossed with a pure white flowered plant. All the F1 generation plants had pink flowers
(a) Give an explanation for the absence of Red and white flowered plants in the F1 generation
(b) If the F1 generation pea plants were selfed, work out the phenotypic ratio of the F2 generation plants.
Date posted:
September 25, 2019
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Answers (1)
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The diagram below represents a stage in the development of human foetus.
(Solved)
The diagram below represents a stage in the development of human foetus.
(a) State one function of each of the structures labelled A and B.
(b) Apart from the size of the foetus what else from the diagram illustrates that parturition was about to occur.
Date posted:
September 25, 2019
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Answers (1)
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State the effects of the contraction of diaphragm muscles during inhalation in mammals
(Solved)
State the effects of the contraction of diaphragm muscles during inhalation in mammals
Date posted:
September 25, 2019
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Answers (1)
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Name two organisms that exhibit symbiotic relationship and explain how each benefits from the association.
(Solved)
Name two organisms that exhibit symbiotic relationship and explain how each benefits from the association.
Date posted:
September 25, 2019
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Answers (1)
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State two types of mechanical digestion along the digestive tract.
(Solved)
State two types of mechanical digestion along the digestive tract.
Date posted:
September 25, 2019
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Answers (1)
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In relation to transport in animals, give a reason why carbohydrates are the best source of energy.
(Solved)
In relation to transport in animals, give a reason why carbohydrates are the best source of energy.
Date posted:
September 25, 2019
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Answers (1)
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The diagram below shows blood circulation in a bony fish. Use it to answer the questions that follow.
(Solved)
The diagram below shows blood circulation in a bony fish. Use it to answer the questions that follow.
Name the structures labelled A and B.
Date posted:
September 25, 2019
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Answers (1)
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Study the diagram below and answer the questions that follow.
(Solved)
Study the diagram below and answer the questions that follow.
a) Name the process represented by the arrows.
b) Name the cell labelled 2.
c) Name the tissue formed by each of the following cells
i) 1
ii) 3
Date posted:
September 25, 2019
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Answers (1)
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student peeled off a piece of epidermis from an onion leaf and observed it under a microscope. He counted 10 cells across the diameter of...
(Solved)
student peeled off a piece of epidermis from an onion leaf and observed it under a microscope. He counted 10 cells across the diameter of the field of view. He then placed a transparent ruler across the field of view and observed the following.
Calculate the size of one cell in μm. show your working
Date posted:
September 25, 2019
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Answers (1)
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Study the diagram below and answer the questions that follow.
(Solved)
Study the diagram below and answer the questions that follow.
a) Identify the bones labelled A and B.
b) Name the joint found in the region labelled Y.
Date posted:
September 25, 2019
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Answers (1)
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Name two plant tissues that are thickened with lignin.
(Solved)
Name two plant tissues that are thickened with lignin.
Date posted:
September 25, 2019
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Answers (1)
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State two unique physical characteristics of skeletal muscles
(Solved)
State two unique physical characteristics of skeletal muscles.
Date posted:
September 25, 2019
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Answers (1)
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An experiment to investigate a certain response by termites, was set up as shown below. The set up was exposed to the sun for some...
(Solved)
An experiment to investigate a certain response by termites, was set up as shown below. The set up was exposed to the sun for some time.
a) What were the results at the end of the experiment?
b) Name the type of response exhibited by the termites.
c) Give one survival value of the response.
Date posted:
September 25, 2019
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Answers (1)
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What is the role of decomposers in an ecosystem?
(Solved)
What is the role of decomposers in an ecosystem?
Date posted:
September 25, 2019
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Answers (1)