a) Agriculture.
- Improved breeds
- Growing crops
- Rearing animals
b) Environment: Conservation of resources; controlling pollution
c) Food technology
- Food processing
- Safe consumption of food/food safety.
marto answered the question on September 25, 2019 at 06:37
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In an experiment to investigate the action of pepsin on egg albumen, equal amount of pepsin were added to equal amount of egg albumen in...
(Solved)
In an experiment to investigate the action of pepsin on egg albumen, equal amount of pepsin were added to equal amount of egg albumen in different test tube. The test tubes were placed in water bath at different temperature. The graph below shows the time taken for the enzymes to digest protein at each temperature.
a) What is the optimum temperature for enzymes?
b) Account for the time taken to digest egg albumen at 600C.
c) With reason name the form in which the enzymes pepsin is secreted.
d) State three other factors that affect enzyme controlled reactions.
Date posted:
September 19, 2019
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Answers (1)
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The flow chart below, illustrates blood circulation in certain organs in humans.
(Solved)
The flow chart below, illustrates blood circulation in certain organs in humans.
a) Name the organ labeled A.
b) Name the blood vessel labeled B and F.
c) State how the consumption of blood in vessel E differs from that in vessel.
d) Name two hormones whose target is the liver when there is variation in simple carbohydrates concentration in blood.
Date posted:
September 19, 2019
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Answers (1)
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The figure below shows part of a food web for the South Atlantic ocean.
(Solved)
The figure below shows part of a food web for the South Atlantic ocean.
a) i) Name the producer in this food web.
ii) Name the top carnivore in this food web.
b) construct a food chain in which leopard seal is a tertiary consumer.
c) In the future, the extraction of mineral resources in the Antarctic might occur on a large scale. This could destroy the breeding-grounds of the Ross seal.
i) State and explain the effects this might have on the population of leopard seal.
ii) List two human activities that can affect the population of organisms in the ecosystem represented by food web.
d) Name the organism with the highest number of predators.
Date posted:
September 19, 2019
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Answers (1)
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State two ways in which white blood cells carry out their functions.
(Solved)
State two ways in which white blood cells carry out their functions.
Date posted:
September 19, 2019
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Answers (1)
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Name the organelle that secretes enzymes in a cell.
(Solved)
Name the organelle that secretes enzymes in a cell.
Date posted:
September 19, 2019
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Answers (1)
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Define tidal volume
(Solved)
Define tidal volume
Date posted:
September 19, 2019
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Answers (1)
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The diagram below shows a part of a flowering plant. Study it and answer the questions that follow.
(Solved)
The diagram below shows a part of a flowering plant. Study it and answer the questions that follow.
i) To which class does the plant belong.
ii) Give a reason for your answer.
Date posted:
September 19, 2019
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Answers (1)
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The process below represents the build-up of a disaccharide in living cells.
(Solved)
The process below represents the build-up of a disaccharide in living cells.
i) Give the name of process represented by letter Y.
ii) Name the bond marked X.
Date posted:
September 19, 2019
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Answers (1)
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The diagram below illustrates the behaviour of red blood cells when placed in two different solutions X and Y.
(Solved)
The diagram below illustrates the behaviour of red blood cells when placed in two different solutions X and Y.
i) Name the process represented by letter A and B.
ii) Identify the type of solution that would prevent processes A and B from taking place when the cells are placed in it.
iii) Draw a diagram to illustrate how a plant cell would appear if placed in solution Y.
Date posted:
September 19, 2019
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Answers (1)
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Name a chemical reagent that can be used to preserve specimens.
(Solved)
Name a chemical reagent that can be used to preserve specimens.
Date posted:
September 19, 2019
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Answers (1)
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The diagram below shows a section of a ribcage of man. Study it and use it to answer questions that follow.
(Solved)
The diagram below shows a section of a ribcage of man. Study it and use it to answer questions that follow.
a) Identify the vertebrae A.
b) Name the two parts (X and Y) of the rib which provide a surface for articulation with vertebrae A.
c) Describe one adaptation of the part labelled Z on vertebrae A.
d) i) Name the bone B that articulates with the rib.
ii) What is the role of the bone named in (i) above in the process of blood synthesis.
Date posted:
September 19, 2019
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Answers (1)
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To estimate the population size of fish in a certain pond, traps were laid at random and 600 fish were caught marked and released back...
(Solved)
To estimate the population size of fish in a certain pond, traps were laid at random and 600 fish were caught marked and released back into the pond. 3 days later traps were laid and 240 fish were caught out of which 80 of them had a mark. Calculate population size of the fish in the pond.
Date posted:
September 18, 2019
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Answers (1)
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During a Practical study students made measurements on a fish and found out that its body lengthfrom the tip of the mouth to the tail...
(Solved)
During a Practical study students made measurements on a fish and found out that its body length from the tip of the mouth to the tail tip was 30cm and the length from the tail tip to the anus was 12cm. Use this information to calculate the tail power of the fish.
Date posted:
September 18, 2019
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Answers (1)
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What is meant by tail power ?
(Solved)
What is meant by tail power ?
Date posted:
September 18, 2019
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Answers (1)
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Below is a diagram of a bony fish which lives in fresh water habitat.
(Solved)
Below is a diagram of a bony fish which lives in fresh water habitat.
a) Name the class to which the fish belongs
b) Using observable features only give two reasons for your answer in (a) above.
c) i) Name the part of the fish labelled N.
ii) State the function of part N
d) State two functions of the part labelled L during movement of the fish in water.
e) Using observable features only describe three ways by which the fish is adapted to living in its habitat.
f) i) Name one structure on the fish that prevents it from pitching.
ii) Name one structure on the fish that prevents it from yawing.
Date posted:
September 18, 2019
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Answers (1)
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The diagram below shows a cross-section through a pistil.
(Solved)
The diagram below shows a cross-section through a pistil.
a) Name the structures labelled K, L and M
b) What do the following parts develop into after fertilization.
i) Part M
ii) Part L
iii) Part N
Date posted:
September 18, 2019
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Answers (1)
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An experiment was set up as shown below.
(Solved)
An experiment was set up as shown below.
a) A student blew air in and out through point X. Using arrows, indicate on the diagram how air gets in and out of the setup.
b) i) In which of the test tube would lime water forms white precipitate first.
ii) Give a reason
Date posted:
September 18, 2019
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Answers (1)
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Identify the type of muscle in human being where formation and effect of lactic acid is not felt.
(Solved)
Identify the type of muscle in human being where formation and effect of lactic acid is not felt.
Date posted:
September 18, 2019
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Answers (1)
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In an experiment to investigate a product of photosynthesis, the set up was as shown in the diagram below. The apparatus was placed in the...
(Solved)
In an experiment to investigate a product of photosynthesis, the set up was as shown in the diagram below. The apparatus was placed in the sun.
a) State the confirmation test for gas Y
b) Explain why Elodea is the most suitable plant for this experiment.
c) State the functions of the sodium hydrogen carbonate in the experiment.
Date posted:
September 18, 2019
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Answers (1)
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A student added equal amounts of blood to equal volumes of salt of different concentrations. She observed and counted the red blood cells at the...
(Solved)
A student added equal amounts of blood to equal volumes of salt of different concentrations. She observed and counted the red blood cells at the beginning of the experiment and at end of the experiment. The results were as shown :
Account for the results in :
a) Set up A
b) Set up B
Date posted:
September 18, 2019
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Answers (1)