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(a) Xylem vessels are hollow (lack cross walls) , hence more efficient in transporting water than tracheids which have trapped ends with perforation;
(b) Xylem vessels are dead due to heavy lignification on their walls hence provision of support to the plant as well preventing collapse
marto answered the question on October 4, 2019 at 09:42
- The diagrams below show stages in the process of feeding shown by amoeba(Solved)
The diagrams below show stages in the process of feeding shown by amoeba
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(d) Name the type of cell in human beings that exhibit this process
Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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The diagram shows a section through a plant organ.
(a)
(i) Name the class of the plant from which the section was obtained belong.
(ii) Give a reason for your answer in (a)(i) above
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Date posted: October 4, 2019. Answers (1)
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The diagram below shows a part of a circulatory system. The arrows indicate the direction of the flow of blood.
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Date posted: October 4, 2019. Answers (1)
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The diagrams below show two conducting elements of the xylem tissue.
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Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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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?
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Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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Study the dental formula of an organism below.
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Date posted: October 4, 2019. Answers (1)
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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.
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Date posted: October 4, 2019. Answers (1)
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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)
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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)
- 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...(Solved)
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?
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c) Name other organisms which also cause food spoilage.
d) State their economic importance to nature.
Date posted: October 4, 2019. Answers (1)
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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
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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)
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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)
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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)