(a) A – Tracheid; B – Vessel;
(b) - Side walls are impregnated wit lignin/deposited with lignin /walls are lignified/pressure of
lignin nucleus not enclosed by a membrane
marto answered the question on October 4, 2019 at 09:23
- Laboratory analysis of a patient’s urine revealed the following concentration of various substances.(Solved)
Laboratory analysis of a patient’s urine revealed the following concentration of various substances.
a) From the analysis above, which disease is the patient suffering from
b) Name two symptoms of the disease in (a) above
Date posted: October 4, 2019. Answers (1)
- Identify two forces that help in upward movement of water in plants.(Solved)
Identify two forces that help in upward movement of water in plants.
Date posted: October 4, 2019. Answers (1)
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An experiment was set-up as shown below to investigate a certain plant process.
(a) What process was being investigated above?
(b) What observation was made if;
(i) The experiment was left in strong wind for one hour?
(ii) All the leaves were removed from the plant?
Date posted: October 4, 2019. Answers (1)
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What is the destination of materials translocated in plants.
Date posted: October 4, 2019. Answers (1)
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The diagram below shows a bone obtained from a mammal.
(a) Name the part of the skeleton from which the bone has been taken.
(b) Label the parts B and C.
(c) State the functions of part A.
Date posted: October 4, 2019. Answers (1)
- Study the dental formula of an organism below.(Solved)
Study the dental formula of an organism below.
(a) (i) What is the total number of teeth this organism possess?
(ii) What is the mode of feeding of the organism?
(b) State two functions of mucus produced along the alimentary canal
Date posted: October 4, 2019. Answers (1)
- a)List three forces that facilitate the transport of water and mineral salts up the stem.
b)Name the tissue that is removed when the bark of a...(Solved)
a)List three forces that facilitate the transport of water and mineral salts up the stem.
b)Name the tissue that is removed when the bark of a dicotyledonous plant is ringed.
Date posted: October 4, 2019. Answers (1)
- The diagram below shows an experiment that was carried out to measure how fast a were plant such as Elodea photosynthesizes(Solved)
The diagram below shows an experiment that was carried out to measure how fast a were plant such as Elodea photosynthesizes
The shoot was exposed to different light intensities and the rate of photosynthesis estimated by counting the number of bubbles of gas leaving the shoot in a given time. the results are given below;
a) Plot these data on apiece of graph paper provided
b) At what light intensity did the shoot produce ;
i) 18 bubbles per minute
ii) 25 bubbles per minute
c) Give two better ways of measuring the rate of photosynthesis than counting bubbles
d) What is the role of light intensity in photosynthesis
e) Account for the expected results of doing this experience at the following temperature;
i) 4ºC
ii) 34ºC
iii) 60ºC
f) Other than light intensity and temperature, name other factors that affect the rate of
photosynthesis
Date posted: October 4, 2019. Answers (1)
- The table below shows the results of an experiment carried out to determine the rate of photosynthesis at different light intensities and varying Carbon (IV)...(Solved)
The table below shows the results of an experiment carried out to determine the rate of photosynthesis at different light intensities and varying Carbon (IV) oxide concentrations. The rate was determined by counting the number of bubbles per minute. The temperature was kept constant.
a) On a graph paper provided, draw a graph for each of the light intensities. All the three graphs should be plotted on the same axis (rate of photosynthesis on vertical axis and carbon (IV) oxide concentration on horizontal axis
b) What is the effect of an increase in carbon (IV) oxide concentrations and light intensities
c) Briefly explain how aquatic green plants meet light intensities and carbon (IV) oxide
requirement
d) Using the data provided in the table state two factors required by the green plants for food
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Date posted: October 4, 2019. Answers (1)
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A student was culturing E. coli (a bacterium) in a Petri-dish. He placed the Petri-dish in an incubator at 30oC.He removed it from the incubator the following day and found that five colonies of bacteria had grown. He decided to return it into the incubator to give it more time. When he removed it fourteen days later, he could not observe any colony.
a) Why was there no colony on the fourteenth day?
b) Explain how bacteria cause spoilage of stored food in warm moist conditions.
c) Name other organisms which also cause food spoilage.
d) State their economic importance to nature.
Date posted: October 4, 2019. Answers (1)
- Form one students from Inungo school arranged their apparatus as shown below, to investigate a certain phenomenon. The set up was placed in light.(Solved)
Form one students from Inungo school arranged their apparatus as shown below, to investigate a certain phenomenon. The set up was placed in light.
(a) State the likely aim of the set up
(b) State the role of the syringe in the set-up above
(c)
(i) Name gas X
(ii) Write an equation to show how gas X was formed in the set-up
(d) State three factors that increase the rate of enzyme activity
(e) Give a reason why the test tube is immersed in a beaker of water
Date posted: October 4, 2019. Answers (1)
- Describe how mammalian small intestine is adapted to its function.(Solved)
Describe how mammalian small intestine is adapted to its function.
Date posted: October 4, 2019. Answers (1)
- The diagram below shows the effect of varying light intensity on the exchange of carbon IV oxide between the leaves of a green plant and...(Solved)
The diagram below shows the effect of varying light intensity on the exchange of carbon IV oxide between the leaves of a green plant and the atmosphere.
a) What is the name given to the point marked x?
b)
i) With reference to carbon IV oxide exchange state what happens at point x.
ii) Explain how the effect observed at point x occurs.
c) Explain why there is a net uptake of carbon IV oxide at light intensity above x.
d) What would happen to the plant if light intensity falling on it were maintained at x throughout?
e) What can you say about the exchange of oxygen between the plant and the surrounding air at intensities below x?
Date posted: October 4, 2019. Answers (1)
- The chart below shows the relationship between concentration of CO2 around the plant and the rate of photosynthesis.(Solved)
The chart below shows the relationship between concentration of CO2 around the plant and the rate of photosynthesis.
(a) Account for the rate of photosynthesis between D-E
(b) Account for the rate of photosynthesis between F-G
(c) Briefly describe the reactions during the light stage of photosynthesis
Date posted: October 4, 2019. Answers (1)
- The diagram below represents a longitudinal section through the ileum wall.(Solved)
The diagram below represents a longitudinal section through the ileum wall.
a) Identify the structure labeled A and B
b) State one function of A and B
c) State two functions of the ileum
d) Explain the role of the liver in digestion
e) State the endocrine role of the pancreas in a mammal
Date posted: October 4, 2019. Answers (1)
- The figure below is a diagram of the anterior portion of the tapeworm. Taenia solium.(Solved)
The figure below is a diagram of the anterior portion of the tapeworm. Taenia solium.
(a) Name the parts labeled A, B, and C
(b) What is the intermediate host of Taenia Solium?
Date posted: October 4, 2019. Answers (1)
- The figure shows the effect of temperature on an enzyme catalyzed reaction.(Solved)
The figure shows the effect of temperature on an enzyme catalyzed reaction.
(a) Explain what happens between A and B
(b) What is X?
Date posted: October 4, 2019. Answers (1)
- The diagram below shows a leaf of a growing plant partly covered with aluminium foil.
The plant was placed in the sun from morning to midday...(Solved)
The diagram below shows a leaf of a growing plant partly covered with aluminium foil.
The plant was placed in the sun from morning to midday and then tested for starch.
(a) What was the aim of the experiment?
(b) State the observation made when the leaf was tested for starch.
Date posted: October 4, 2019. Answers (1)
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Name two products of light reaction used in the dark reaction.
Date posted: October 4, 2019. Answers (1)
- (a) State two difference between monosaccharide and polysaccharides.
(b) Name the bond found in proteins(Solved)
(a) State two difference between monosaccharide and polysaccharides.
(b) Name the bond found in proteins
Date posted: October 4, 2019. Answers (1)