Ich2106:Biochemistry I Question Paper
Ich2106:Biochemistry I
Course:Bachelor Of Science In Public Health
Institution: Meru University Of Science And Technology question papers
Exam Year:2010
QUESTION ONE (30 MARKS)
a) Differentiate between the following terms; (10 Marks) i. Sporophyte; gametophyte ii. Protoplasm; cytoplasm iii. Rhizome; rhizoid iv. Isotonic; hypotonic v. Parenchyma; sclerenchyma b) The cell theory was proposed after the rejection of an earlier theory about living things; i. What was the earlier theory? (1 Mark) ii. What are the postulates of the latter theory? (3 Marks) c) Describe the structure and function of i. Chloroplast (2 Marks) ii. Mitochondrion (2 Marks) d) i) Using a suitable diagram, illustrate the anatomy of a dicot root. (2 Marks) ii) Apart from d(i) above, give three other distincitive features of dicots. (3 Marks) e) Describe various forms of leaf arrangement on the stem. (3 Marks) f) Botanical knowledge can contribute to addressing food security. Explain how. (4 Marks)
QUESTION TWO (20 MARKS)
a) Expound on the critical functions of water in plants. (8 Marks) b) i) Describe the factors affecting transpiration in plants. (6 Marks)
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ii) Transpiration has been described as a “necessary evil”. Explain why and describe which plant adaptations contribute to reduction of transpiration. (6 Marks)
QUESTION THREE (20 MARKS)
a) The 5 – kingdom system proposed by Whittaker (1969) has been widely accepted for classification of living things as opposed to the 2-kingdom system earlier. Discuss why. (10 Marks) b) Describe leaf morphological variations as “diagnostic” taxonomic characters. (10 Marks)
QUESTION FOUR (20 MARKS)
a) Summarise using a suitable graph the growth phases exhibited by annual plants. (9 Marks) b) Describe various methods one can experimentally use to measure growth. (5 Marks) c) Describe the correct way to go about collecting and preserving herbarium plant specimens. (6 Marks)
QUESTION FIVE (20 MARKS)
a) With the aid of a suitable diagram, classify the 16 essential plant nutrients. (10 Marks) b) Describe the role and deficiency symptoms associated with the following elements. i. Nitrogen (4 Marks) ii. Calcium (3 Marks) iii. Zinc (3 Marks)
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