Xylem vessels:
- Are lignified or thickened to prevent collapsing,
- Have long and narrow lumen to facilitate capillarity
- Made of dead cells to ensure passage of water.
- No cross walls for continuous flow/column of water
- Have bordered pits for lateral movement of water
johnmulu answered the question on May 2, 2017 at 08:57
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The diagram below represents the pathways of water from the soil into the plant.
(Solved)
The diagram below represents the pathways of water from the soil into the plant.
a) Name the structures labeled K and L.
b) Name the process by which minerals salts enter into the plant.
Date posted:
May 2, 2017
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Answers (1)
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Name two structures used for gaseous exchange in plants.
(Solved)
Name two structures used for gaseous exchange in plants.
Date posted:
May 2, 2017
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Answers (1)
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The diagram below represents a transverse section of a young stem
(Solved)
The diagram below represents a transverse section of a young stem
a) Name the parts labeled A and B.
b) State the function of the parts labeled C, D and E
Date posted:
May 2, 2017
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Answers (1)
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Give three factors that determine the amount of energy a human being requires in a day
(Solved)
Give three factors that determine the amount of energy a human being requires in a day
Date posted:
May 2, 2017
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Answers (1)
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Describe the process of carbohydrate digestion in human beings
(Solved)
(a) How is a human stomach adapted to (i) Protein digestion? (ii) Churning?
b) What happens to the glucose synthesize during photosynthesis?
Date posted:
May 2, 2017
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Answers (1)
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a)Name the appropriate food substance from substance for each of the following enzymes (i)Ptyalin (ii) Pepsin
(Solved)
a)Name the appropriate food substance from substance for each of the following enzymes (i)Ptyalin (ii) Pepsin(b) State the causes and two symptoms of Beri-beri.
Date posted:
May 2, 2017
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Answers (1)
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State two ways in which the human intestinal villus is adapted to its function.
(Solved)
State two ways in which the human intestinal villus is adapted to its function.
Date posted:
May 2, 2017
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Answers (1)
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Name two nutrients that are absorbed without being digested by enzymes in humans.
(Solved)
Name two nutrients that are absorbed without being digested by enzymes in humans.
Date posted:
May 2, 2017
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Answers (1)
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The diagram below represents part of the human digestive system.
(Solved)
The diagram below represents part of the human digestive system.
a) Name the organs labelled L and M.
b) i) Name the substance produced by the organ labeled K
ii) State the function of the substance named in b (i) above
Date posted:
May 2, 2017
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Answers (1)
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State the functions of carbohydrates in the human body.
(Solved)
State the functions of carbohydrates in the human body.
Date posted:
May 1, 2017
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Answers (1)
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What is the role of bile salts in digestion in humans?
(Solved)
What is the role of bile salts in digestion in humans?
Date posted:
May 1, 2017
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Answers (1)
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The diagram below represents the lower jaw of a mammal
(Solved)
The diagram below represents the lower jaw of a mammal
a) Name the mode of nutrition of the mammal whose jaw is shown.
b) i) Name the toothless gap labeled K.
ii) State the function of the gap.
c) Name the substance that is responsible for hardening of teeth.
Date posted:
May 1, 2017
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Answers (1)
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Explain how the following factors determine the daily energy requirement in human:(a)Age(b)Occupation(c) Sex
(Solved)
Explain how the following factors determine the daily energy requirement in human:
(a)Age
(b)Occupation
(c) Sex
Date posted:
May 1, 2017
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Answers (1)
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State the function of iron in the human body.
(Solved)
State the function of iron in the human body.
Date posted:
May 1, 2017
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Answers (1)
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Explain how the carnassial teeth of a dog are adapted to their function.
(Solved)
Explain how the carnassial teeth of a dog are adapted to their function.
Date posted:
May 1, 2017
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Answers (1)
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a) The action of ptyalin stops at the stomach. Explain.(b) State a factor that denatures enzymes(c) Name the features that increase the surface area of small intestines
(Solved)
a) The action of ptyalin stops at the stomach. Explain.
b) State a factor that denatures enzymes
c) Name the features that increase the surface area of small intestines
Date posted:
May 1, 2017
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Answers (1)
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a) Name a fat soluble vitamin manufactured by the human body.(b) State two functions of potassium ions in the human body
(Solved)
a) Name a fat soluble vitamin manufactured by the human body.
b) State two functions of potassium ions in the human body
Date posted:
May 1, 2017
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Answers (1)
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The diagram below represents a section though a human tooth
(Solved)
The diagram below represents a section though a human tooth
a) i) Name the type of tooth shown.
ii) Give a reason for your answer in (a)(i) above.
b) State the functions of potassium ions in the human body.
Date posted:
May 1, 2017
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Answers (1)
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a) State three functions of bile juice in the digestion of food.
(b) How does substrate concentration affect the rate of enzyme action?
(Solved)
a) State three functions of bile juice in the digestion of food.
(b) How does substrate concentration affect the rate of enzyme action?
Date posted:
May 1, 2017
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Answers (1)
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a) Distinguish between the terms homodont and heterodont
b) What is the function of carnassial teeth?
(Solved)
a) Distinguish between the terms homodont and heterodont
b) What is the function of carnassial teeth?
Date posted:
May 1, 2017
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Answers (1)