(a) Cell membrane.
(b)- Enclose or protect cell contents.
-Allow selective passage of substances in and out of the cell.
(c) i) Centriole.
ii) Formation of cilia and flagella/formation of spindle fibres.
sharon kalunda answered the question on September 16, 2019 at 12:38
-
Some form three students took a germinating maize grain and placed it in a starch paste in a petri dish and put the Petri dish...
(Solved)
Some form three students took a germinating maize grain and placed it in a starch paste in a petri dish and put the Petri dish in a water bath maintained at 30oC. After 48 hours the starch paste was irrigated with iodine solution .The area around the maize grain changed to the colour of iodine solution while the rest turned blue –black.
(a) Account for the observation
(b) Why was the Petri dish put in a water bath maintained at 30oC?
Date posted:
September 16, 2019
.
Answers (1)
-
The diagram below represents a simple endocrine feedback mechanism in a human male.
(Solved)
The diagram below represents a simple endocrine feedback mechanism in a human male.
(a) Name the hormone labeled X
(b) State two differences that may be observed between a normal male and one who is incapable of producing hormone labeled Y
Date posted:
September 16, 2019
.
Answers (1)
-
What are the functions of the odontoid process found on the axis bone of the cervical vertebra?
(Solved)
What are the functions of the odontoid process found on the axis bone of the cervical vertebra?
Date posted:
September 16, 2019
.
Answers (1)
-
Active yeast cells were added to a dilute sugar solution in a container. The mixture was kept in a warm room. After a few hours...
(Solved)
Active yeast cells were added to a dilute sugar solution in a container. The mixture was kept in a warm room. After a few hours bubbles of gas were observed escaping from the mixture.
(a) Write an equation to represent the chemical reaction above.
(b) What is the economic importance of this type of chemical reaction in industry?
Date posted:
September 16, 2019
.
Answers (1)
-
In which part of the spinal cord is the cell body of the motor neurone found?.
(Solved)
In which part of the spinal cord is the cell body of the motor neurone found?.
Date posted:
September 16, 2019
.
Answers (1)
-
State the role of the swim bladder in a fish.
(Solved)
State the role of the swim bladder in a fish.
Date posted:
September 16, 2019
.
Answers (1)
-
Name the division of the Kingdom plantae with the following spore producing bodies.
(i) Sori
(ii) Capsule
(Solved)
Name the division of the Kingdom plantae with the following spore producing bodies.
(i) Sori
(ii) Capsule
Date posted:
September 16, 2019
.
Answers (1)
-
A small amount of chemical M was put on one side of maize celeoptiles. After some days, it was noted that the celeoptiles curved away...
(Solved)
A small amount of chemical M was put on one side of maize celeoptiles. After some days, it was noted that the celeoptiles curved away from the side to which the chemical was applied.
(a) Suggest the possible identity of chemical substance M
(b) Explain how this chemical might have caused the celeoptiles to curve.
Date posted:
September 16, 2019
.
Answers (1)
-
In a blood test, a few drops of anti-B serum were added to two samples of blood. It was noted that agglutination occurred.What were the...
(Solved)
In a blood test, a few drops of anti-B serum were added to two samples of blood. It was noted that agglutination occurred.What were the possible blood groups of the two blood samples?
Date posted:
September 16, 2019
.
Answers (1)
-
Industrial wastes may contain metabolic pollutants. State how such pollutants may indirectly reach and accumulate in the human body if the wastes were dumped into...
(Solved)
Industrial wastes may contain metabolic pollutants. State how such pollutants may indirectly reach and accumulate in the human body if the wastes were dumped into rivers.
Date posted:
September 16, 2019
.
Answers (1)
-
The apparatus whose diagram is given below can be used to demonstrate results of a physiological process that occurs in a mammal. To use the...
(Solved)
The apparatus whose diagram is given below can be used to demonstrate results of a physiological process that occurs in a mammal. To use the apparatus, the experiment places his mouth at the point marked X and breaths in and out gently.
a. State the observations in the boiling tube when the experimenter
i) Breaths in:
Boiling tube, A
Boiling tube, B
b) Breaths out:
Boiling tube, A
Boiling tube, B
c. What conclusions can you draw from the results of this experiment
d. What is the purpose of the boiling tube A?
Date posted:
September 16, 2019
.
Answers (1)
-
A patient whose blood group is A died shortly after receiving blood from a person of blood group B. Explain the possible cause of the...
(Solved)
A patient whose blood group is A died shortly after receiving blood from a person of blood group B. Explain the possible cause of the death of the patient.
Date posted:
September 16, 2019
.
Answers (1)
-
Construct a step in a dichotomous key using two animals one with two pairs of legs and the other with four pairs of legs.
(Solved)
Construct a step in a dichotomous key using two animals one with two pairs of legs and the other with four pairs of legs.
Date posted:
September 16, 2019
.
Answers (1)
-
The diagram below shows the difference in growth response to varying hormone concentration by root and shoot
(Solved)
The diagram below shows the difference in growth response to varying hormone concentration by root and shoot
What is the effect of increasing auxin concentration on:
i) Roots
ii) Shoot
Date posted:
September 16, 2019
.
Answers (1)
-
State two ways in which human body is naturally protected against harmful bacteria.
(Solved)
State two ways in which human body is naturally protected against harmful bacteria.
Date posted:
September 16, 2019
.
Answers (1)
-
Complete the table below on mineral nutrition in plants.
(Solved)
Complete the table below on mineral nutrition in plants.
Date posted:
September 16, 2019
.
Answers (1)
-
State one major importance of convergent evolution to living organisms.
(Solved)
State one major importance of convergent evolution to living organisms.
Date posted:
September 16, 2019
.
Answers (1)
-
Figure 1 represents a bat wing. Figure 2 a whale paddle and figure 3 an insect wing. Study the diagrams and answer the questions that...
(Solved)
Figure 1 represents a bat wing. Figure 2 a whale paddle and figure 3 an insect wing. Study the diagrams and answer the questions that follow.
(i) In figure 1, identify bones: H and E
(ii) Name the type of joint formed by bones H and E.
(iii) Identify the type of structures shown above and the type of evolution.
Structures:
Type of evolution:
Date posted:
September 16, 2019
.
Answers (1)
-
The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(Solved)
The figure below shows feet of various birds. Study the diagram and answer the questions that follow.
(a) Giving a reason, state the type of food eaten by Bird E.
Food eaten:
Reason:
(b) Name the habitat of bird D and give a reason for your answer.
Habitat:
Reason:
(c) Identify the type of structures shown by the feet above and give a reason for your answer.
Type of structure:
Reason:
(d) State the type of evolution shown by the structures.
Date posted:
September 16, 2019
.
Answers (1)
-
You are provided with plant specimens below.
(Solved)
You are provided with plant specimens below.
A) Construct a dichotomous key using the features given below in order.
(i) Leaf type
(ii) Leaf venation
(iii) Leaf colour
(iv) Leaf margin
(v) Number of leaflets
(vi) Attachment of leaflets
1) (a) Leaf simple ……………………………………………. go to 2
(b) …………………………………………………………………………….
2) (a) ……………………………………………………………………………
(b) Leaf with network venation …………………………… go to 4
3) (a) ……………………………………………………………………………
(b)…………………………………………………………………………….
4) (a) ……………………………………………………………………………
(b)…………………………………………………………………………….
5) (a) ……………………………………………………………………………
(b)…………………………………………………………………………….
6) (a) ……………………………………………………………………………
(b)…………………………………………………………………………….
B) Using the steps followed, identify the plant specimens provided.
Date posted:
September 16, 2019
.
Answers (1)