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(a) light causes the auxins to migrate to the lower side; leading to higher auxins concentration on the lower side than the upper side ;the cells on the lower side of the curvature grows and elongate faster than the those on the upper side; leading to straightening of hypocotyl.
(b)
-Turns green for photosynthesis prior to formation of the primary/first foliage leaves
- Protects the embryo from external mechanical damage during germination
- Storage of germination enzymes
maurice.mutuku answered the question on August 14, 2019 at 06:19
- The micrographs below is of a tissue showing mitosis. Examine it and answer the questions.(Solved)
The micrographs below is of a tissue showing mitosis. Examine it and answer the questions.
(a) i. Identify the tissue from which the micrographs were obtained
ii. Give a reason for your answer in a) i above
iii.Name the stages represented by R and T.
(b) State two significance of mitosis to an organism.
(c) Name two regions in higher plants where cells actively undergo mitosis.
Date posted: August 14, 2019. Answers (1)
- A red cow was mated with a white bull. All F1 offspring were neither red nor white.Such individuals are said to be roan.(Solved)
A red cow was mated with a white bull. All F1 offspring were neither red nor white.Such individuals are said to be roan.
(a) Using letter R to represent the gene for red colour and W for the gene for white colour. Work out the genotypes of the F1 offspring.
(b) If the F1 offspring were selfed, state the phenotypic and genotypic ratios of the F2 offspring.
(c) State two importance of using plants in genetics experiments.
Date posted: August 14, 2019. Answers (1)
- The diagram below illustrates the structure in the human eye.
(Solved)
The diagram below illustrates the structure in the human eye.
(i) State one way in which the part labelled c is suited to its functions.
(ii) State the functions of the cells in the part labelled D
(iii) State the changes that occur in part A to facilitate vision of a distance object.
Date posted: August 14, 2019. Answers (1)
- 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)