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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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- What is meant by tail power ?(Solved)
What is meant by tail power ?
Date posted: September 18, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- The photograph below is two varieties of peppered moth Biston betularia resting on the bark of a tree.(Solved)
The photograph below is two varieties of peppered moth Biston betularia resting on the bark of a tree.
Explain using the photograph how natural selection will determine the survival of each variety.
Date posted: September 18, 2019. Answers (1)
- Study the flow diagram showing the role of the pancreas in controlling blood glucose concentration;(Solved)
Study the flow diagram showing the role of the pancreas in controlling blood glucose concentration;
i) Name the endocrine tissue labelled A.
ii) Name the hormone B produced by a cells.
iii) Name the hormone C produced by the B cells.
iv) Name the process represented by the dotted lines.
v) Briefly describe how hormone B brings about a rise in blood glucose concentration when it reaches
the liner.
Date posted: September 18, 2019. Answers (1)
- The photograph labeled K is an intact mammalian heart while photograph K1 and K2are sections of a mammalian heart .Examine them(Solved)
The photograph labeled K is an intact mammalian heart while photograph K1 and K2are sections of a mammalian heart .Examine them
The vessels labeled A and B drains blood in a chamber that leads to another chamber labeled J. The blood vessel labeled 3 drains blood into the chamber labeled L. When water is pumped under low pressure through vessel 3, it flows out through the vessel labeled 4. When water is pumped under low pressure through vessels A and B it flows out through the vessel labeled 2.
i. Name the chambers labeled Land J
ii. Name the blood vessels 2,3 and 4.
iii. Observe the walls of chamber J and those of chamber N in the sections of the heart. Account for the difference in the thickness of the walls.
iv. Name the structure labeled H and state its role.
Date posted: September 18, 2019. Answers (1)
- The photographs below show specimens of different types of fruits. Examine them.(Solved)
The photographs below show specimens of different types of fruits. Examine them.
a) State the differences between specimens P and R
b) State the types of gynoecium and placentation of specimens P,S and V.
Specimen P:Gynoecium
Placentation
Specimen S Gynoecium
Placentation.
Specimen V Gynoecium.
Placentation
Name the mode of dispersal for each specimen and the features that adapt the specimen its mode of dispersal.
Date posted: September 18, 2019. Answers (1)
- Students carried an experiment and arranged their apparatus as shown below, to investigate a certain phenomenon.The set up was placed in light.(Solved)
Students carried an experiment and 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: September 18, 2019. Answers (1)
- What is Ecdysis?(Solved)
What is Ecdysis?
Date posted: September 18, 2019. Answers (1)
- Examine the diagram shown below and answer questions that follow.(Solved)
Examine the diagram shown below and answer questions that follow.
(i) What does the diagram represent?
(ii) Name parts labeled.
A
B
E
Date posted: September 18, 2019. Answers (1)
- A person met a lion as he walked along a forest path.
(i) Name the hormone that was secreted in his bloodstream and state its source....(Solved)
A person met a lion as he walked along a forest path.
(i) Name the hormone that was secreted in his bloodstream and state its source.
(ii) What is the effect of the hormone in his:
(a) Circulatory system.
(b) Respiratory system.
Date posted: September 18, 2019. Answers (1)
- Where is the hormone thyroxin produced?(Solved)
Where is the hormone thyroxin produced?
Date posted: September 18, 2019. Answers (1)