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a) (i) The level of caustic potash in retort flask rises ;
(ii)Oxygen has been used up by germinating peas ‘The caustic potash raises to occupy the spaces ;
(b) No observable change ;
sharon kalunda answered the question on May 24, 2019 at 09:20
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Date posted: May 24, 2019. Answers (1)
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a) Name the type of joint shown in the diagram.
b) Name the parts labelled...(Solved)
The diagram below represents one of the joints in the mammalian skeleton.
a) Name the type of joint shown in the diagram.
b) Name the parts labelled Z and U
c) Name two parts at the body where this type of joint is found.
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Date posted: May 24, 2019. Answers (1)
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b) State the functions of the parts labelled A and C
c) Name the...(Solved)
The diagram below represent a seedling.
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b) State the functions of the parts labelled A and C
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e) What is the importance of optimum temperature in seed germination ?
Date posted: May 24, 2019. Answers (1)
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a) Name the parts labelled A and C on the diagram.
b) State the functions...(Solved)
The diagram below represents a transverse section of a young stem.
a) Name the parts labelled A and C on the diagram.
b) State the functions of the parts labelled B, D and E
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Date posted: May 24, 2019. Answers (1)
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Date posted: May 24, 2019. Answers (1)
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ii) State the significance of the...(Solved)
The diagram below is a cross section through a part of human ileum.
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c) Give the functions of the part labelled B and C.
Date posted: May 24, 2019. Answers (1)
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Date posted: May 24, 2019. Answers (1)
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Date posted: May 24, 2019. Answers (1)
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seeds was placed at...(Solved)
In an experiment, 900 viable seeds of a certain plant species were divided into groups of 100 seeds each. Each group of
seeds was placed at different temperatures but same conditions of air and moisture. The percent germination was
determined after 10 days. The table below shows percent germination at the various temperatures.
a) Using a suitable scale, draw a graph of percent germination against temperature.
b) Account for percent germination at :
i) 50°
ii) 30°C
iii) 40°C
c) Explain the role played by each of the following factors in the germination of seeds.
i) Water.
ii) Air.
Date posted: May 24, 2019. Answers (1)
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State TWO features of the endodermis.
Date posted: May 24, 2019. Answers (1)
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i) Name the structure labelled A.
ii) State TWO substances transported in the phloem....(Solved)
The diagram below represents phloem tissue from the stem of a plant.
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ii) State TWO substances transported in the phloem.
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Date posted: May 24, 2019. Answers (1)
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The petri dishes were...(Solved)
Three sterilized petri dishes I, II and III were half filled with sterilized nutrient agar jelly and then treated as shown below.
The petri dishes were then kept in an oven at 36°C. After 2 days the three petri dishes were flooded with iodine solution.
a) Yellow spots were noted in set up I and II while set up III turned blue black.
i) What was the importance of sterilization in the experiment?
ii) Mention TWO ways by which sterilization could have been achieved.
b) Explain the results obtained in each of the three petri dishes after 2 days.
Date posted: May 24, 2019. Answers (1)
- 50cm³ of 10% glucose solution was boiled and allowed to cool. The solution was then poured into a vacuum flask and about
5cm³ of groundnut oil...(Solved)
50cm³ of 10% glucose solution was boiled and allowed to cool. The solution was then poured into a vacuum flask and about
5cm³ of groundnut oil added to it. 10% yeast solution was introduced into the glucose solution using a pipette. A
thermometer was placed in the flask and supported with a cotton wool plug. A second flask was set up as above, but
containing cooled boiled water instead of 10% glucose solution. The temperature of each flask was recorded at the
beginning and thereafter at hourly intervals for several hours.
a) Why was a vacuum flask used in this experiment?
b) What was the purpose of the second flask?
c) Write a word equation to summarize the reaction that took place in the first flask.
d) Why was groundnut oil added to the flask?
e) Why was it necessary to boil the glucose and the water before they were poured into the flask?
Date posted: May 24, 2019. Answers (1)