a. The power of making an image larger
Magnification is the ratio of the image size to the object size. Magnification (M) = height of the image / height of the object. When the ratio is greater than one we say the image is magnified and when less than one we say it is diminished.
Also magnification = image distance from the mirror / object distance from the mirror.
b. cutting very thin sections.
thin sections allow light to pass through making it easy to observe the tissue
Use a sharp razor blade during the cutting
sharp blade does not damage, deform, destroy or distort the surface of cell or tissue it makes thin sections
Placing sections in water to maintain turgidity hence maintain shape of cell it prevents drying of the section
Staining the sections with iodine before observing
To make chloroplasts, starch containing structures, granules or plastids distinct.
simiyu kelly answered the question on September 15, 2017 at 09:20
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1. (a) what is classification? (b) List the external features used to classify plants (c) List the external features used to classify animals...
(Solved)
a. What is classification?
b. List the external features used to classify plants
c. List the external features used to classify animals
d. Give the reasons why classification is important
e. Name the taxonomic units of classification in descending order
Date posted:
September 15, 2017
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Answers (1)
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Describe how herbaceous plants obtain their support?
(Solved)
Describe how herbaceous plants obtain their support?
Date posted:
September 13, 2017
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Answers (1)
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State the economic importance of the following excretory products in plants (i)Nicotine (ii)Quinine
(Solved)
State the economic importance of the following excretory products in plants
i)Nicotine
ii)Quinine
Date posted:
September 13, 2017
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Answers (1)
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Name the causative agent of whooping cough
(Solved)
Name the causative agent of whooping cough
Date posted:
September 13, 2017
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Answers (1)
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The equation below represents a metabolic reaction that occurs in the mammalian liver
Amino acids -------> Organic compounds + urea
(Solved)
The equation below represents a metabolic reaction that occurs in the mammalian liver
Amino acids ------->Organic compounds + urea
(a) Name the process
(b) What is the course of amino acids in the process?
(c) What is the difference between essential and non-essential amino acids?
Date posted:
September 13, 2017
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Answers (1)
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Why do guard cells lie in close association with epidermal cells?
(Solved)
Why do guard cells lie in close association with epidermal cells?
Date posted:
September 13, 2017
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Answers (1)
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State two adaptations of tracheal system in insect to its functions
(Solved)
State two adaptations of tracheal system in insect to its functions
Date posted:
September 12, 2017
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Answers (1)
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Name the blood vessel that transports blood from small intestine to the liver
(Solved)
What is the name given to the blood vessel that transports blood from small intestine to the liver?
Date posted:
September 5, 2017
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Answers (1)
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The diagram below represents bones at a joint found in the hind limb of a mammal.
(Solved)
The diagram below represents bones at a joint found in the hind limb of a mammal.
(a) Name the bones labeled X, Y and Z
(b) (i) Name the substance found in the place labeled W.
(ii) State the function of the substance named in (b) (i) above.
(c) Name the structure that joins the bones together at the joint.
(d) State the differences between ball and socket joint and the one illustrated in the diagram above.
(e) Name the structure at the elbow that performs the same function as the same function as the patella.
Date posted:
May 26, 2017
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Answers (1)
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The diagram below represents a mammalian pelvic girdle.
(Solved)
The diagram below represents a mammalian pelvic girdle.
(a) State the function of obturator foramen.
(b)(i) Name the bone that articulates with the pelvic girdle at acetabulum.
(ii) Name the type of joint formed by the acetabulum and the bone named in (c) above
(c) Name a bone formed by the fusion of caudal vertebrae in human beings.
Date posted:
May 26, 2017
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Answers (1)
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The diagram below illustrates the arrangement of bones and muscles in the human arm.
(Solved)
The diagram below illustrates the arrangement of bones and muscles in the human arm.
(i) Name the bones labelled K and L.
(ii) Explain how the upwards movement of the lower arm is brought about by the bones and muscles shown in the diagram above.
Date posted:
May 26, 2017
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Answers (1)
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State the difference between ball and socket and hinge joint
(Solved)
State the difference between ball and socket and hinge joint
Date posted:
May 25, 2017
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Answers (1)
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Name three types of skeletons found in multicellular animals.
(Solved)
Name three types of skeletons found in multicellular animals.
Date posted:
May 25, 2017
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Answers (1)
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State three structural differences between biceps and muscles of the gut.
(Solved)
State three structural differences between biceps and muscles of the gut.
Date posted:
May 24, 2017
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Answers (1)
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State three ways in which support is brought about in a leaf.
(Solved)
State three ways in which support is brought about in a leaf.
Date posted:
May 24, 2017
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Answers (1)
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State three ways by which plants compensate for lack of ability to move from one place to another.
(Solved)
State three ways by which plants compensate for lack of ability to move from one place to another.
Date posted:
May 24, 2017
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Answers (1)
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What makes young herbaceous plant remain upright?
(Solved)
What makes young herbaceous plant remain upright?
Date posted:
May 24, 2017
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Answers (1)
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State the importance of tactic response among some members of kingdom protista.
(Solved)
State the importance of tactic response among some members of kingdom protista.
Date posted:
May 24, 2017
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Answers (1)
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The diagram below represents the transverse section of the spinal cord.
(Solved)
The diagram below represents the transverse section of the spinal cord.
(a) Name the part labelled H.
(b) State two functions of the fluid found in the parts labelled J.
(c) Give a reason for the colour of white matter.
Date posted:
May 24, 2017
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Answers (1)
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The diagram illustrates a nerve cell.
(Solved)
The diagram illustrates a nerve cell.
(a) Name the type of nerve cell illustrated.
(b) Give a reason for your answer in (a) above
(c) Identify the part labelled J
Date posted:
May 24, 2017
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Answers (1)