SECTION A
Answer all questions in this section
1. In what direction does translocation occur in plants?
2. Name two tissues that are likely to be removed when a stem is removed
3. Name the last blood vessel that will transport glucose to the heart if glucose solution is injected through the arm (b) which chamber of the heart receive the glucose solution.
4 Which part of the brain controls breathing? The Diagram below illustrates two homologous chromosomes during meiosis. Use it to answer question 5
5. Name those points labeled i (b)What is the Importance of those in evolution? (c) what is this stage of melosis called?
Study diagrams i and ii below and use them to answer question 6
6. (a) Identify the organism illustrated in diagrams i and ii
(b) State the levels of organization of i and ii
(c) State a reason for placing i and ii in that level of organization.
Study the diagram below and use it to answer question 7
7. (a) Name the parts labeled i to iv (b) What is the function of the part labeled I?
Study the diagram below and use it to answer questions 8 (a) and (b)
8. (a) What is the set-up used for? (b) Why is the leafy shoot cut under water when setting up the environment? (c) Name the instrument used for measuring water turbidity.
9. (a) Name three methods of preventing food spoilage. Study the diagram below and use it to answer question 10 (a) and (b).
10. (a) Name the parts labeled i to iv (b) State the functions of the parts labeled ii and iv (c) In which organ in the mammalian body is urea formed?
SECTION B
Answer all questions in this section
11. (a) You are provided with specimens A and B (a) (i). Cut a piece of Specimen A, put a drop of iodine on it then record your observation.
(ii) From your observation, what food nutrient does specimen A contain? (ii) Give reasons for your answers
(b) Put a drop of specimen B on the top right hand corner of your question paper using a glass rod. Spread the drop. Clean the glass rod to remove every trace of specimen B. Allow both drops of specimen B and water to dry
(i) Record your observation (ii) From your observation, what food nutrient does specimen B contain? (ii) Give reasons for your answers.
(c) Put 4cm\(^3\) of specimen B in a test tube and add 5cm\(^3\) of water.(i) Record your observation (ii) Shake the content thoroughly and leave it for 3 minutes to settle
Record your observation.
(d) (i) Add 2cm\(^3\) of NaOH to 5cm\(^3\) of specimen B in a clean test tube. Shake thoroughly and observe the mixture. Record your observation.
(ii) What substance in the alimentary canal plays the same role during digestion in mammals as NaOH in this experiment?
12. You are provided with specimens C and D (a) Identify specimen C and D: (i) State the part to which each of the specimens C and D (ii) State two differences specimens C and D.
(b) How can you propagate specimen C? (ii) Give one reason for your answer based on observable feature of specimen C
(c) Make a labeled diagram 10-12cm long of specimen C to show its external features.
13. (a) identify specimens E and F (b) Suggest the agents of pollination of specimen E (c) Give three reasons for your suggestion in (b)
In a tabular form, State three differences specimens E and F. (e) with a sharp blade or scalpel cut a longitudinal section of specimen E to produce two equal parts of specimen E. Make a labeled drawing 10 cm to 12 cm, of one half ofspecimen E
Explanation
SECTION A
1.From green leaves to other parts of the plant
2. Epidermis, cortex, cambium and phloem.
3. (a) Superior vena cava (b) Right auricle or right atrium
4. Medulla oblongata
5. (a) Chiasmata (b) Exchange of genetic materials which brings about variation (c) Late prophase
6. (a)- Chlamydomonas Il - Volvox (b) both cellular level of organization (c) They are both unicellular organisms
7. (a) -Sucker or cement gland lI - mouth, III coiled intestine IV- Anus tail fin, VI - tail muscle (b) For attachment of leaves
8. Demonstration of transpiration pull (B) To prevent air bubbles from entering and blocking the xylem vessels (c) Secchi disc
9. (i) Freezing/refrigeration (ii) Drying (ii) Salting
10. (a) 1- cortex, II- Renal artery - pelvis, IV- pyramid V - ureter, VI- medulla (b) transports to the bladder transports oxygenated blood containing urea from the aorta to the kidneys, V Carries urine from the kidney to the bladder for temporary storage (c) The liver.
SECTION B
11. specimen A -A piece of yam (a) (i) The cut surface of specimen A turned blue-black (i) Specimen A containing iodine solution usually turns blue-black when in contact with starch. (b) (i) Specimen B is oil. The piece of paper turned TRANSLUCENT (ii) Specimen B is oil/fat (iii) Paper will turn translucent when rubbed with oil/fat
(c)(i) two separate layers of liquids are formed in the test-tube. The water settled at the bottom layer while Specimen B on top (ii) After the content was shaken thoroughly and left for three minutes, it was observed that specimen B broke into tiny oil droplets and distributed all over the water, later, two separate layers were formed with :Specimen B on top and water below (d) (i) After 2 cm\(^3\) of Sodium hydroxide was added to 5cm\(^3\) of specimen B (oil) observation was as follows. Emulsification occurred (ii) Bile
12. (i) Specimen C Rhizome (Ginger) (ii) Specimen C belongs to stem specimen D Swollen taproot (Carrot) Specimen D - belongs to root.
|
Specimen C |
Specimen D |
|
Presence of terminal buds |
No terminal bud |
|
Presence of nodes and internodes |
Absence of nodes and internodes |
(b) (i) Specimen C - propagation is by stem-cutting i.e vegetative propagation (ii) Due to the presence of Terminal buds.
13. (a) Specimen E Flower of Flame of the Forest or Pride of Barbados. Specimen F- flower of grass or maize plant (b) Agents of pollination are bees, butterfly, any small bird (c) Reasons Presence of nectar, Presence of scent, brightly colored petals.
(d) Differences
|
Specimen E |
Specimen F |
|
Brightly colored petals |
Petals are dull |
|
Presence of scent |
No scent present |
|
Stigma is present |
Absence of stigma |
|
Presence of rough pollen grains |
Presence of smooth pollen grains |