Explanation

(a) < ZXY = 225° - 135°

= 90°.

\(\therefore /ZY/ = 80^{2} + 60^{2}\)

= \(6400 + 3600 = 10000\)

\(/ZY/ = \sqrt{10000}\)

= 100 km.

(b) From \(\Delta\) XYZ,

\(\tan \theta = \frac{opp}{adj}\)

\(\tan \theta = \frac{80}{60} = 1.333\)

\(\theta = \tan^{-1} (1.333)\)

\(\theta = 53.13°\)

Bearing of Z from Y = \(360° - (45° + 53.13°)\)

= \(360° - 98.13°\)

= \(261.87° \approxeq 262°\) (3 significant figures)

Correct Answer: C. qualitative higher education

Correct Answer: C. \(\frac{5}{12}\)

Explanation

Let the girls pocket money be rep. by x. The amount spent on books = \(\frac{1}{4}of\hspace{1mm}x = \frac{x}{4}\)

The amount spent on dress \(=\frac{1}{3} of \hspace{1mm}x=\frac{x}{3}\)

?The fraction that remains = \(\frac{x}{1}-\left(\frac{x}{4}+\frac{x}{3}\right)\\

\frac{3x+4x}{12}; = \frac{12x-7x}{12} = \frac{5x}{12} = \frac{5}{12}\)

Correct Answer: A. durability

Correct Answer: B. horn

Correct Answer: C. Oba Kosoko

Correct Answer: C. radio waves

Correct Answer: A. taunt and ridicule the Jews

Correct Answer: B. 600cm³

Explanation

(a) The process of perceiving smell

• Chemical substances/odour carried in the air pass through the air/nasal cavity
• The molecules dissolve in the moist membrane of the nasal cavity
• Sensory cells are stimulated
• Impulses are formed
• which pass through the nerves ending to the olfactory nerves
• which pass into the cerebrum of the brain/brain
• The brain interprets the impulses
• And the sensation of smell is produced/smell is perceived

(b)Adaptive features of the egg of a domestic fowl;

Porous: shell; for gaseous exchange/provides shelter/ protects the embryo against mechanical damage/ desiccation

Shell membranes; allow gaseous exchange/for protection

Yolk; contains high level of proteins and fats/provides food for embryonic-growth

Egg white/albumen;consists of water to absorb shock/ proteins/food

Air space;provides surface for gaseous exchange Chalaza; holds the yolk/embryo in position.

(c)i. Autotrophs: Organisms that do not rely on other organisms for food/they manufacture their own food; from using simple inorganic compounds; can be chernosyn-thetic/photosynthetic

ii. Examples of unicellular autotrophs Clamydomonas; Euglena; chemosynthetic; bacteria/ sulphur, bacteria; blue-green; algae/Anabaena; Nostoc/ Oscillatoria; Chlorella diatoms; Nitrosomonas; Nitrobacteria

(d) Functions of WHO

1. provides grants for medical research
2. Improves public health/promotes environmental health
3. prevents the spread of diseases vaccination
4. provides vaccines/drugs in cases of emergencies
5. Informs/creates awareness/educates the public of any research findings/outbreak of diseases
6. Assists by sending medical personnel/logistical sup-port to countries upon request
7. Helps in the training of medical personnel
8. keeps health statistics
9. promotes nutritional/sanitary products.

(e) Examples of plants and animals that live in fresh water pond

Plants: Water arum; diatoms; Ceratophyllum/hornwort; utricularia/bladderwort. Arrowhead/sedge; Pistia; Salvinia/water fern; water lily; wolffish/duckweed any other correctly.

Animals: Cyclops; Daphnia/water flea; Hippopotamus; crocodile; water snake; tadpoles; pond skaters; zooplanktons; mosquito larvae; water bugs; water scorpions; leeches; water snails; catfish/Tilapia fishes etc.

(f) Differences between skin of a mammal and epidermis of leaf

(g) Type of competition on

(i) Plot A: intra specific/intra species competition

(ii) Plot B: interspecific/interspecies competition