You are provided with stirring rod, delivery tube, test tube, Irish potato, scalpel, measuring cylinder and solutions in the beakers labeled by letters N1, N2, N3, and N4. Follow the procedures as directed in (i)-(vii) to demonstrate the process of capillarity and osmosis experiments, and answer the questions that follow. (i) Dip a delivery tube in the beaker containing solution N1 and a stirring rod in the beaker containing solution N2 until it reaches 5 cm deep while holding them careful to ensure that they do not touch the bottom of the beakers for 5 minutes. (ii) Remove the delivery tube and stirring rod from the beakers containing solution N1 and N2 after 5 minutes and observe what is happening. (iii) Peel the Irish potato to remove the outer cover and chip it to make four (4) small bars of about 4 cm long and 3 mm thick. (iv) Place two bars in a test tube which is half filled with water. Boil for 2 minutes and allow it to cool. (v) Place one boiled bar and one unboiled bar into the beaker containing solution N3. (vi) Place one boiled bar and one unboiled bar into the beaker containing solution N4. (vii) After 30 minutes remove the bars from solutions N3 and N4. Try to bend each bar and touch to feel its texture.

1. What was your observation after 5 minutes when a delivering tube and stirring rod were deepened into solutions N1 and N2 in procedure (i)? (0 mk)
2. Account for observation made in procedure (i). (0 mk)
3. Which of the beakers N1 and N2 acted as a control of the capillarity experiment? Give reason to support your answer. (0 mk)
4. Which tissue found in plants can perform the same function as represented by delivery tube in this experiment? (0 mk)
5. How does the function of capillarity investigated in this experiment important for the survival of the plants? (0 mk)
6. Briefly explain the cause of each texture observation in (f) (i). (0 mk)
7. Briefly explain the cause of each texture observed in (g) (i). (0 mk)
8. Which of the bars in solutions N3 and N4 acted as a control of osmosis experiment? Give reason to support your answer. (0 mk)
9. Which of the solutions N3 and N4 had the higher concentration of solute molecules? (0 mk)

Upgrade to see model answers.

You are provided with specimens A, B, C and D, study them carefully and answer the following questions:

1. Why scientists prefer binomial nomenclature in naming the organisms A, B, C and D instead of common names? (0 mk)
2. Give two benefits of the specimen A to man. (0 mk)
3. Classify each of the specimens C and D to class level. (0 mk)
4. Why are the specimens C and D placed in the same phylum but different classes? (0 mk)
5. What are the two benefits that specimen B has in the ecosystem? (0 mk)

Upgrade to see model answers.