Get premium membership and access questions with answers, video lessons as well as revision papers.
Process is passive; particles / air molecule move along a diffusion gradient / concentration gradient.
maurice.mutuku answered the question on November 12, 2019 at 12:22
- State two precautionary measures which should be taken in preventing the spread of HIV.(Solved)
State two precautionary measures which should be taken in preventing the spread of HIV.
Date posted: November 12, 2019. Answers (1)
- The figure below shows change in dry mass of germinating bean seeds with time.(Solved)
The figure below shows change in dry mass of germinating bean seeds with time.
Account for the;
(i) Decline in dry mass between A and B.
(ii) Rapid increase in dry mass between C and D.
Date posted: November 12, 2019. Answers (1)
- The diagram below represents a cell organelle as seen under electron microscope.(Solved)
The diagram below represents a cell organelle as seen under electron microscope.
(i) Identify the organelle.
(ii) State the function of the organelle named in (i) above in the cell.
(iii) State one visible adaptation that makes it suitable to perform its function.
(iv) Name one cell that has a large number of the organelle named in (i) above.
Date posted: November 12, 2019. Answers (1)
- State the structural differences between the xylem and phloem.(Solved)
State the structural differences between the xylem and phloem.
Date posted: November 12, 2019. Answers (1)
- The diagram below represents a kidney nephron.(Solved)
The diagram below represents a kidney nephron.
(a) Name the parts labeled G, and H.
(b) Name the process that takes place in the glomerulus.
(c) Name the substances that are reabsorbed into the blood at the part labeled J.
(d) A patient was found to pass out large volumes of dilute urine.
(i) State the disease from which the patient was suffering from.
(ii) What is the cause of the disease stated in (d) (i) above?
(e) Name substance K.
Date posted: November 7, 2019. Answers (1)
- Work out the chance that a son of a normal man and a woman who is a carrier for haemophilia will be a haemophiliac. Let...(Solved)
Work out the chance that a son of a normal man and a woman who is a carrier for haemophilia will be a haemophiliac. Let the gene for normal blood clotting be H.
Date posted: November 7, 2019. Answers (1)
- The diagram below represents a germinating seedling.(Solved)
The diagram below represents a germinating seedling.
(i) State the type of germination shown in the diagram.
(ii) Name the part labeled E.
(iii) What is the function of the endosperm labeled F?
Date posted: November 7, 2019. Answers (1)
- The diagram below represents a human digestive system.(Solved)
The diagram below represents a human digestive system.
(a) Name the muscles found in the part labeled A.
(b) Name and explain the role of the juice contained in the sac labeled B.
(c) Explain two adaptations of the part labeled D to its function.
Date posted: November 7, 2019. Answers (1)
- Study the bio-chemical reactions given below.
a)Identify the process marked I and II
b)Explain how the process marked II can be carried out in a laboratory.(Solved)
Study the bio-chemical reactions given below.
a)Identify the process marked I and II
b)Explain how the process marked II can be carried out in a laboratory.
Date posted: October 31, 2019. Answers (1)
- Explain why there are only a few days in each menstrual cycle when fertilization can occur.(Solved)
Explain why there are only a few days in each menstrual cycle when fertilization can occur.
Date posted: October 31, 2019. Answers (1)
- Give two reasons for screening blood before transfusion.(Solved)
Give two reasons for screening blood before transfusion.
Date posted: October 31, 2019. Answers (1)
- A person who is blood group AB has an advantage over a person who is blood group O. Explain.(Solved)
A person who is blood group AB has an advantage over a person who is blood group O. Explain.
Date posted: October 31, 2019. Answers (1)
- The diagram below represents a longitudinal section of a bean study it and answer the questions that follow:
a) Identify the parts labeled A to D.
b)...(Solved)
The diagram below represents a longitudinal section of a bean study it and answer the questions that follow:
a) Identify the parts labeled A to D.
b) Give the role of the plant labeled D.
c) What type of germination would the seed shown above undergo?
Date posted: October 31, 2019. Answers (1)
- The letters ‘N’ and n represents the dominant and recessive genes for hemophilia respectively.
Write down the genotype of the following
a)Homozygous dominant
b)Homozygous recessive
c)Heterozygote(Solved)
The letters ‘N’ and n represents the dominant and recessive genes for hemophilia respectively.
Write down the genotype of the following
a)Homozygous dominant
b)Homozygous recessive
c)Heterozygote
Date posted: October 30, 2019. Answers (1)
- During research on different types of plants students found a plant that looked like the one shown below
a)Identify the plant.
b) Name the parts labeled A,...(Solved)
During research on different types of plants students found a plant that looked like the one shown below
a)Identify the plant.
b) Name the parts labeled A, B, C and D.
c)State the division to which the plant belongs.
Date posted: October 30, 2019. Answers (1)
- The diagram below represents a synapse
a) Indicate the direction of the impulse on the diagram
b) State two significances of a synapse in the body (Solved)
The diagram below represents a synapse
a) Indicate the direction of the impulse on the diagram
b) State two significances of a synapse in the body
Date posted: October 30, 2019. Answers (1)
- The diagram below represents a certain organism collected by a student on his way to school
a) State the class to which the organism belongs
b) Give...(Solved)
The diagram below represents a certain organism collected by a student on his way to school
a) State the class to which the organism belongs
b) Give two reasons for your answer (a) above
Date posted: October 30, 2019. Answers (1)
- The diagram below represents a section or portion of a certain nucleic acid.(Solved)
The diagram below represents a section or portion of a certain nucleic acid.
With a reason, identify the types of nucleic acid whose portion is shown above
Identity
Reason
Date posted: October 9, 2019. Answers (1)
- The table below shows the percentage composition by volume of inhaled and exhaled air.(Solved)
The table below shows the percentage composition by volume of inhaled and exhaled air.
(a) By what percentage is carbon (iv) oxide concentration in inhaled air higher than exhaled air.
(b) Explain the differences in the composition of the gases between inhaled and exhaled air.
Date posted: October 9, 2019. Answers (1)
- In a blood test, a few drops of anti- serum were added to two samples of blood. It was observed that agglutination occurred. What were...(Solved)
In a blood test, a few drops of anti- serum were added to two samples of blood. It was observed that agglutination occurred. What were the possible blood groups of the two blood samples?
Date posted: October 9, 2019. Answers (1)