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Name one factor that is maintained at a relatively constant level in the body by the following organs
i) Liver
ii) Skin
iii) Kidneys
Date posted:
January 17, 2017
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Homeostasis is defined as "the maintenance of a stable internal environment" in the body. What is meant by the expression "internal environment"?
Date posted:
January 17, 2017
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Explain why when using an electron microscope to study specimens
(a) The images formed are viewed either on a fluorescent screen or photographic plates.
(b) It is not possible to observe living materials
Date posted:
January 17, 2017
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Other than xylem tissue, name two strengthening tissues in plants.
Date posted:
January 17, 2017
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Name the main mineral elements obtained from insects by insectivoros plants
Date posted:
January 16, 2017
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Which factors within the seed that cause seed dormancy?
Date posted:
January 16, 2017
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Name the ground material of each of the following organelles:
a) Chloroplast
b) Nucleus
c) Mitochondrion
d) Plant cell vacuole
Date posted:
January 16, 2017
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Explain why only mutations in the genes of gametes can influence evolution.
Date posted:
January 16, 2017
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Name the type of evolution that produces analogous structures
Date posted:
January 16, 2017
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What are the important functions of fruits to the life cycle of plant?
Date posted:
January 16, 2017
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Addition of a dye to specimen during the preparation for viewing under the light microscope is called
Date posted:
January 16, 2017
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Name one living cell in the plant and in the animal body that, when mature, lacks a nucleus.
Date posted:
January 16, 2017
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What is the role of air in a germinating seed?
Date posted:
January 16, 2017
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Give two advantages of metamorphosis to the life of insects.
Date posted:
January 16, 2017
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Give the difference between homologous and analogous structures.
Date posted:
January 16, 2017
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Name two respiratory surfaces in a mature frog apart from the lungs.
Date posted:
January 16, 2017
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Give the effect of denitrifying bacteria in the soil.
Date posted:
January 16, 2017
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Name the part of plant where nitrogen fixation takes place.
Date posted:
January 16, 2017
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State two water-borne human diseases that are characterized by severe diarrhea.
Date posted:
January 16, 2017
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Name the habitat of a plant that:
i) Has stomata on the upper leaf surface only
ii) Has sunken stomatal pores
Date posted:
January 16, 2017
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State two factors which destroy the semi-permeability of the cell membrane.
Date posted:
January 16, 2017
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Name the organelle that performs each of the following functions in a cell
i) Controls movement of substance in and out of the cell
ii) Stores enzymes
Date posted:
January 16, 2017
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State one advantage of heterodonts over homodonts.
Date posted:
January 14, 2017
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State the; a) Material that strengthens the xylem tissue.
b) Tissue that is removed when the bark of a dicotyledonous plant is ringed.
Date posted:
January 14, 2017
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State the following responses;
i) Euglena migrates from a dark place towards light.
ii) Hairs and leaves of insectivorous plants close rapidly and trap insects when they land on the plants.
Date posted:
January 14, 2017
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State two theories advanced to support the origin of life
Date posted:
January 14, 2017
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State two biological significance of dormancy in seeds.
Date posted:
January 14, 2017
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What type of variation is exhibited by the ability to roll the tongue in humans?
Date posted:
January 14, 2017
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Explain how the following occur during chromosomal mutations;
i) Non - disjunction
ii) Deletion
Date posted:
January 14, 2017
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Which structure encloses the heart?
Date posted:
January 14, 2017