(i)
-transparent to allow light into the eye
-curved to refract light to the eye
(ii) Rods for vision in dim light/low light intensity; cones for vision in high light intensity
(iii) Ciliary muscles relax; suspensory ligaments become tight and pull the lens; the lens become thinner and less refractive; light from a distant object is less refracted so the image is formed in the retina.
maurice.mutuku answered the question on August 14, 2019 at 05:22
-
A number of industries in Nairobi and Machakos counties have recently been found to direct their effluents into Nairobi River and Athi River respectively. State...
(Solved)
A number of industries in Nairobi and Machakos counties have recently been found to direct their effluents into Nairobi River and Athi River respectively. State two effects of each of the following substances present in the industrial effluents.
(a) Lead.
(b) Oils.
Date posted:
August 13, 2019
.
Answers (1)
-
Describe the changes that occur in the eye when a person enters a poorly lit room.
(Solved)
Describe the changes that occur in the eye when a person enters a poorly lit room.
Date posted:
August 13, 2019
.
Answers (1)
-
The diagram below shows a mammalian bone. Use it to answer questions that follow.
(Solved)
The diagram below shows a mammalian bone. Use it to answer questions that follow.
(a) With a reason, identify the bone.
Identity:
Reason:
(b) Identify each of the parts labelled:
A:
B:
(c) State the function of the part labelled C.
Date posted:
August 13, 2019
.
Answers (1)
-
Below is a diagram of organism of a particular kingdom.
(Solved)
Below is a diagram of organism of a particular kingdom.
(a) Identify the kingdom to which it belongs.
(b) Name the parts labelled:
A:
B:
(c) Other than absorption of food state one main role of structure labelled C.
Date posted:
August 13, 2019
.
Answers (1)
-
In an experiment, some germinating seeds were placed in a large air tight flask and left for 3 days.
(Solved)
In an experiment, some germinating seeds were placed in a large air tight flask and left for 3 days. What are the expected changes in composition of air inside the flask?
Date posted:
August 13, 2019
.
Answers (1)
-
Cylinders of potato tissue were immersed in sucrose solutions differing in their solute potential 24 hours and the percentage change in length determined.The results are...
(Solved)
Cylinders of potato tissue were immersed in sucrose solutions differing in their solute potential 24 hours and the percentage change in length determined.The results are shown in the graph below.
(a) With reference to water potential, explain the change in length that occurred when the cylinder potato was immersed in a sucrose solution of solute potential – 600 kPa.
(b) Using the information in the graph, determine the water potential of the potato tissue. Explain your reasoning.
Date posted:
August 13, 2019
.
Answers (1)
-
Explain why acquired characteristics are not heritable.
(Solved)
Explain why acquired characteristics are not heritable.
Date posted:
August 13, 2019
.
Answers (1)
-
State the biological significance of each of the following in the digestive system.
(Solved)
State the biological significance of each of the following in the digestive system.
(i) Emulsification of lipids.
(ii) Thin epithelium of the ileum.
Date posted:
August 13, 2019
.
Answers (1)
-
The diagram below shows part of the mammalian female reproductive system.
(Solved)
The diagram below shows part of the mammalian female reproductive system.
(a) Name the part labelled B.
(b) State the function of part labelled B.
(c) State adaptations of the part labeled A.
Date posted:
August 13, 2019
.
Answers (1)
-
Explain why specimens must be mounted in a vacuum in electron microscope.
(Solved)
Explain why specimens must be mounted in a vacuum in electron microscope.
Date posted:
August 13, 2019
.
Answers (1)
-
Give reasons why an electron microscope cannot be used to view live specimens.
(Solved)
Give reasons why an electron microscope cannot be used to view live specimens.
Date posted:
August 13, 2019
.
Answers (1)
-
The diagram below shows a gaseous exchange structure in the stems of angiosperms.
(Solved)
The diagram below shows a gaseous exchange structure in the stems of angiosperms.
Name;
(a) Part labelled A.
(b) The apparatus labelled X.
(c) Substances represented by arrows B and C.
Date posted:
August 13, 2019
.
Answers (1)
-
Explain why glucose and proteins are absent in the urine of a healthy person.
(Solved)
Explain why glucose and proteins are absent in the urine of a healthy person.
Date posted:
August 13, 2019
.
Answers (1)
-
Complete the table below.
(Solved)
Complete the table below.
Date posted:
August 13, 2019
.
Answers (1)
-
In actively photosynthesizing cells the sugars formed are quickly converted to starch. What is the
biological advantage of this?
(Solved)
In actively photosynthesizing cells the sugars formed are quickly converted to starch. What is the
biological advantage of this?
Date posted:
August 13, 2019
.
Answers (1)
-
State the role of the following during photosynthesis:(i) Carbon (IV) oxide.(ii) Light energy from the sun.
(Solved)
State the role of the following during photosynthesis:
- Carbon (IV) oxide.
Date posted:
August 13, 2019
.
Answers (1)
-
What is the function of Eyebrows?
(Solved)
What is the function of Eyebrows?
Date posted:
August 13, 2019
.
Answers (1)
-
A person fell from the third floor of a building and had part of his brain damaged. Name the part of the brain damaged if...
(Solved)
A person fell from the third floor of a building and had part of his brain damaged. Name the part of the brain damaged if the person suffers from the following.
(i) Loss of speech
(ii) Inability to regulate body temperature.
(iii) Lack of body balance.
Date posted:
August 13, 2019
.
Answers (1)
-
Name the branch of biology that:
(a) Deals with phylogenetic relationship between organisms.
(b) Deals with disputed parentage.
(c) Would be useful to a beekeeper.
(Solved)
Name the branch of biology that:
(a) Deals with phylogenetic relationship between organisms.
(b) Deals with disputed parentage.
(c) Would be useful to a beekeeper.
Date posted:
August 13, 2019
.
Answers (1)
-
The diagrams below shows leaves obtained from plant A and C grown in the same habitat.
(Solved)
The diagrams below shows leaves obtained from plant A and C grown in the same habitat.
Identify the leaf that will lose the least amount of water. Justify your answer.
Date posted:
August 13, 2019
.
Answers (1)