a) i) Boiling tube A;
Atmospheric air rushes in through tube R/. bubbles form in the lime water;
Lime water remains clear;
Boiling tube B;
Lime water rises in tube S
ii) Boiling tube A;
Lime water rises up the tube R;
b) Boiling tube B
Bubbles of air occur in the lime water
Lime water turns to white precipitate
c) Conclusion that can be drawn from the result
Exhaled air has more carbon (IV) oxide than inhaled air;
d) The purpose of boiling tube A
It is a control (for B); Experiment
sharon kalunda answered the question on September 16, 2019 at 11:16
-
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)
-
An experiment was carried out to determine the growth rates of bamboo and a variety of maize plants in two adjacent plots.The average height and...
(Solved)
An experiment was carried out to determine the growth rates of bamboo and a variety of maize plants in two adjacent plots.The average height and average dry weight of plants from the two populations were determined over a period of twenty weeks. The data is as shown in the table below.
(a) Between which two weeks did the greatest increase in weight occur in:
(i) Bamboo plants:
(ii) Maize plants:
(b) (i) Which of the two types of plants had a higher productivity by the end of the experiment?
(ii) Give a reason for your answer in (b) (i) above.
(c) Between weeks 14 and 18, the average height of the maize plants remained constant while average dry weight increased.Explain this observation.
(d) Suggest how the change in the average dry weight bamboo and maize plants would have been at week 22 if the experiment was continued.
(e) Why was it appropriate for this experiment to use:
(i) Dry weight instead of fresh weight.
(ii) Weight and height.
(f) Describe how the average height and weight of the plants were determined in this experiment.
(i) Average height.
(ii) Average dry weight.
(g) Give a reason why secondary thickening does not occur in bamboo and maize plants.
Date posted:
September 16, 2019
.
Answers (1)
-
During an ecology, students collected and marked 40 ants and then released them. After 2 days, the students captured another 100 ants, 40 of which...
(Solved)
During an ecology, students collected and marked 40 ants and then released them. After 2 days, the students captured another 100 ants, 40 of which had been marked previously.
(i) How many ants were there in the compound? Show your working.
(ii) Give two assumptions of this method in sampling animal population.
Date posted:
September 16, 2019
.
Answers (1)
-
Study the food web below representing a certain ecosystem and use it to answer the questions that follow.
(Solved)
Study the food web below representing a certain ecosystem and use it to answer the questions that follow.
(i) Write down a food chain in which the vulture is a tertiary consumer.
(ii) What would be the effect of introducing gazelles and termites into the ecosystem?
Date posted:
September 16, 2019
.
Answers (1)
-
The equation below represents a certain physiological process. Study it and answer the questions below.
(Solved)
The equation below represents a certain physiological process. Study it and answer the questions below.
(i) Name the above process.
(ii) Give two reasons for question (i) above.
(iii) Calculate the respiratory quotient of the compound that was as the substrate.
(iv) Identify the substrate being respired in the above equation.
(v) State one importance of this process to living organisms.
(vi) Name the organelle where the above process takes place in animal cells.
Date posted:
September 16, 2019
.
Answers (1)
-
A man with normal skin colour got married to a woman with normal skin colour. They gave birth to three children; one of them an...
(Solved)
A man with normal skin colour got married to a woman with normal skin colour. They gave birth to three children; one of them an albino.
(a) Identify the probable genotype of the parents using letter (A) for normal gene and (a) for defective gene.
Man:
Woman:
(b) Using a genetic cross; show the genotypes of the offspring.
(c) Give the phenotypic ratio of the offsprings.
Date posted:
September 16, 2019
.
Answers (1)
-
Use the graph below to answer the questions that follow.
(Solved)
Use the graph below to answer the questions that follow.
(a) Calculate the difference in nitrate concentration between the highest and lowest.
(b) How can increase in nitrate concentration in the river lead to death of fish?
(c) Suggest one possible sources of nitrate that lead to the pollution in a river.
Date posted:
September 16, 2019
.
Answers (1)
-
The diagram below shows a seed of a certain plant.
(Solved)
The diagram below shows a seed of a certain plant.
(a) Name the likely agent of dispersal.
(b) Give a reason for your answer.
Date posted:
September 16, 2019
.
Answers (1)
-
Name the source of hydrochloric acid in the mammalian heart.
(Solved)
Name the source of hydrochloric acid in the mammalian heart.
Date posted:
September 16, 2019
.
Answers (1)
-
Study the diagram and answer the questions that follow.
(Solved)
Study the diagram and answer the questions that follow.
(a) State the division the organism belongs.
(b) Name the part labelled K.
(c) What is the function of the part labelled M?
Date posted:
September 16, 2019
.
Answers (1)
-
The chemical equation below represents a physiological process that takes place in living organisms.
(Solved)
The chemical equation below represents a physiological process that takes place in living organisms.
Name:
(i) The process R:
(ii) Substance Q:
Date posted:
September 16, 2019
.
Answers (1)
-
Explain how the Iris muscle controls the size of pupil when exposed to bright light.
(Solved)
Explain how the Iris muscle controls the size of pupil when exposed to bright light.
Date posted:
September 16, 2019
.
Answers (1)