-
- You are provided with a solution L. Using the reagents provided; determine the food compounds in L. Fill in the table below.
FOOD COMPOUND
PROCEDURE
OBSERVATION
CONCLUSION
- Place 10mls of solution L in a visking tubing. Tie both ends and place it in 50mls of distilled water contained in a beaker.leave the set up for 20 minutes and make observations.
- Observations. (1mark)
- Account for the observation in b (i) above. (2marks)
- Give the equivalent of a visking in the bodies of living organisms. (1mark)
- You are provided with a solution L. Using the reagents provided; determine the food compounds in L. Fill in the table below.
- Study the photomicrograph of the longitudinal section of a maize fruit below and answer the questions that follow.
-
- Name the parts labelled A, B, C and D. (4marks)
A
B
C
D - Give the role played by A and D. (2 marks)
A
D
- Name the parts labelled A, B, C and D. (4marks)
-
- Name the type of germination exhibited by maize grain. ( 1 mark)
- Place the organisms from where the photomicrograph was obtained into its
Kingdom
Division
Class (3marks) - State three characteristics of members of the class identified in b (ii) above (3marks
- Give one reason why the maize grain is classified as a fruit. (1mark)
-
- Study the organisms drawn below and answer the questions that follow.
- Use the dichotomous key below to identify the class the organisms belong to. (12 marks)
-
- Phylum Chordata ……………………………………………………… go to 2
- Phylum arthropoda ……………………………………………………. go to 3
-
- Has scales on the body ………………………………………………… go to 4
- Has no scales on the body …………………………………………..… Mammalia
-
- Has cephalothorax ……………………………………………….……. Arachnida
- Has no cephalothorax …………………………………………………. go to 5
-
- Has fins ………………………………………………………………… Pisces
- Has no fins ……………………………………………………………... go to 7
-
- Has three pairs of legs …………………………………………………. Insecta
- Has more than three pairs of legs ……………………………………… go to 6
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- Two pairs of legs per segment ………………………………………… Diplopoda
- One pairs of legs per segment …………………………………………. Chilopoda
-
- Has feathers ……………………………………………………………. Aves
- Has no feathers ………………………………………………………… go to 8
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- Has a tail ……………………………………………………………….. Reptilia
- Has no tail …………………………………………………………….. Amphibia
Specimen
Step followed
Identity
A
B
C
D
E
F
-
- If the actual length from the tip of the mouth to the tip of the tail of the specimen B is 100mm, calculate the magnification. (2marks)
- Use the dichotomous key below to identify the class the organisms belong to. (12 marks)
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