1.State two Structural differences between the nymph of cockroach and an adult cockroach.
2. List three characteristic features of cross-pollinated flowers.
3. Give a reason why the testes in most mammals are located outside the body cavity
4. State the structure used by each of the following organism for movement: (a) Ameba (b) Euglena (c) Paramecium.
5. List three types of stimuli detected by the sensory nerve endings on the skin.
6. Explain the function of the ciliary muscles of the eye.
7. How many “daughter” cells are produced in (a) meiosis (b) mitosis?
8. The graphs show the limit of tolerance of some species of fish I, Il and lll to water temperature. (a) From the graphs, what can you deduce about the geographical range of species i and ili? (b) What is the optimal temperature for growth of species I, Il and IIl?
9. Name three abiotic factors which plants growing close to each other may compete for?
10. Name four excretory products of plants.
11. (a) (i) identify specimens A, B,C and D without reasons. (ii) To which class of animals do specimens B and C belong? (ii) State the excretory structures possessed by each of specimens B and D. (b) State two external features used by specimen C for gaseous exchange. (c) Mention (i) three structural similarities (i) two structural differences between specimens B and C (d) Make a labeled drawing 8-10 cm long of the ventral view of specimen A.
12. (a) identify specimen E without reasons. (b) Make a labeled drawing 8-10cm long of the cut surface of specimen E.
13.(a) identity specimens F, GH, I, J and K without reasons. (b) Copy and complete the table below into your answer booklet
Put a tick ( ✓ ) where appropriate
| SPECIMEN | ANNUAL | PERENNIAL | CASH CROP | FOOD CROP |
| F | ||||
| G | ||||
| H | ||||
| I | ||||
| J | ||||
| K |
Explanation
1. The structural differences between the nymph of cockroach and an adult cockroach are:
|
Adult Cockroach |
Nymph |
|
Winged/Wings present |
Wingless/presence of wind buds |
|
More prominent anal styles |
Less prominent anal style |
|
Prominent egg pouch |
Less prominent egg pouch |
|
Bigger /named body part |
Smaller /Corresponding named body part. |
|
More prominent cerci |
Less prominent cerci |
|
Long antenna |
short antennae |
2. Characteristic features of cross- pollinated flowers are: Protandry/stamen/androecium ripening before the gynoecium/pistil, Protogyny /pistil/ gynoecium ripening before the stamen/ androecium, Unisexual flower, Self sterility, brightly colored, Scented, presence of nectar - sticky/rough/spiny pollen grains
sticky stigma - light pollen grains
3. Testes in most mammals are located outside the body cavity to ensure that the testes can remain at a temperature lower than the normal body temperature as the body temperature is too high for sperm formation. The temperature of the scrotal sac is more conducive for sperm production.
4 (a) Ameba uses pseudopodium /pseudopodia/false foot/ false feet for movement. (b) Euglena uses flagellum- flagella for movement, (c) Paramecium uses cilia /cilium for movement.
5. The types of stimuli detected by the sensory nerve endings on the skin are: touch/tactile,pressure, temperature, pain.
6. Functions of the ciliary muscles of the eye are to alter the shape of the lens, so as to control its focussing power accommodation
7. (a) Four "daughter cells" are produced in meiosis and (b) Two daughter cells for mitosis.
8. (a) Species is adapted to cold conditions/ temperate /cold regions with a temperature of O°C 11°C and therefore, its distribution will not be wide geographically, Species lll is adapted to 10°C- 40°C, hence a wide range of distribution. It is likely to be found in warm temperature of hot tropical regions (b) Optimal temperature for growth of Species I is 4/5°/6° C. (4°-6°C); Optimal temperature for growth of Species ll is 14°/ 15°/ 16°C. (14°- 16°C), Optimal temperature for growth of Species lll is 22°/ 23°/24/ 25° C (22°-25°C)
9. Abiotic factors which plants growing close to each other may compete for are: nutrients, mineral salts, light, sunlight, sunshine, solar energy, water, moisture, space. 10. Four excretory products of plants are: CO2/carbon IV oxide /carbon dioxide O\(_2\) / oxygen, Alkaloids (e.g. cocaine/ morphine/quinine/etc), Resins: e.g - gums, latex, mucilage, tannins, ammonia, water/water vapor.
11. (a) (i) Specimen A= Pelvic girdle, osinnomination, half pelvic girdle; Specimen B = small mammal, e.g. rat, rabbit, guinea pig, mice, squirrel etc. Specimen C= Toad, frog. Specimen D =Leaf of a dicotyledonous plant, e.g.mango, orange leaf.
|
Specimen B |
Mammal /mammalia |
|
Specimen C |
Ampibia /amphibian |
|
Specimen B |
Kidney/skin/lung |
|
Specimen D |
Stoma/Stomata /stomates |
(Some of the external features used by specimen C for gaseous exchange are: skin, (external), nostril/nares- buccal cavity/mouth
(C) Similarities between specimen B and C: (1) 2 pairs of limbs (2) a pair of eyes (3) a pair of hearing organs/ears (4) nostrils/nares for external respiration/ gaseous exchange (5) both have anterior opening (mouth) and posterior opening (anus) (6) Limbs end up in digits
(ii) Structural differences between Specimens B and C
|
Mammal (B) |
Toad (c) |
|
Pinna present |
Pinna absent |
|
Hair present |
Hair absent |
|
Tail present |
Tail absent |
|
Body not watery |
Body watery |
|
Digits end in claws |
Digits without claws |
|
Toes not webbed |
Webbed toes |
|
Nictitating membrane absent in the eye |
Nictitating, membrane present in the eye |
|
Whiskers present |
Whiskers absent |
|
No bulging eyes |
Bulging eyes present |
|
Neck present |
Neck absent or no distinct neck |
|
Limbs with five digits |
Limbs with four digits |
|
Poison gland absent |
Poison gland present. |
12. a . Specimen E = Vertical section of ( bird's ) egg or longitudinal section of ( bird's ) egg
13. (a) F = Maize/Corn (grain); G = Onion /onion bulb/bulb; H Ginger/rhizome; I = Cowpea / bean/ bean seed Cocoyam /corm/potato (stem) tuber: K= Oil palm seed/kernel or coconut seed/endosperm.
(b)
|
Specimen |
Annuals | Perennial | Cash Crop |
Food Crop |
|
F = Maize |
✓ |
✓ |
||
|
G = Onion |
✓ |
✓ |
||
|
H = Ginger |
✓ | ✓ |
✓ |
|
| I = Cowpea | ✓ |
✓ |
||
| J = Cocoyam | ✓ |
✓ |
||
| K = Oilpalm / Coconut | ✓ | ✓ |
✓ |
(d) Difference between specimens F and l
|
F(Maize grain) |
I (Cowpea) |
|
- Remains of style present/two scars |
present |
|
Pericarp present |
Pericarp absent |
|
Testa and pericarp fused |
Only testa present |
|
Only one cotyledon present |
Two cotyledons present |
|
Endosperm present |
Endosperm absent |