Explanation

(a) Sensory cells are specialised cells which receive a particular stimulus. Normally they convert stimuli into impulses and transmit such impulses or sensation to the brain or spinal cord or central nervous system.

(b) (i) The function of lens is that it reflects rays or makes fine adjustment to focus object on the retina

(ii) Vitreous humour reflects light rays onto the retina or helps maintain spherical shape of the eye

(iii) Optic nerve transmits sensory impulses to the brain or transmits sensory impulses from the brain

(c )(i) The four structures which protect the eye against injury are

(1) Eye lids

(2) Eye lashes

(3) Eye socket or bonying socket

(4) conjunctive.

The eye lid is closed to protect the eye from foreign particles or mechanical injury. During blinking it carries water from the tear glands to moisten or irrigate the eye with tear or water to keep it moist. Eye lashes also acts as a hood and protects the eye from glare or excessive light. It also shields the eye against sweat, water or dust. Conjunctiva provides protective shield to the inner most delicate structure and gets inflamed during infection instead of the entire eye. Eye socket houses or encloses the eye balls. It shields or gives protection from mechanical injury, e.g. from a blow.

(d) In a dark room, the iris contracts while the pupil dilates or opens widely to allow in more light. On sudden exposure to bright sun-light, the pupil which is still wide open allows in too much light which bleaches pigment in the rod cells and this causes the dazzling sensation experienced. The iris muscle gradually relaxes within a few seconds. The pupil constricts gradually to regulate the entry of the required amount of light for the vision to return to normal.

Correct Answer: D. the value of a commodity

Explanation

An ad valorem tax (Latin for according to value) is a tax whose amount is based on the value of a transaction or of property. It is typically imposed at the time of a transaction, as in the case of a sales tax or value-added tax (VAT)

Correct Answer: A. political patronage

Explanation

Political patronage is often defined as public office awarded in payment for political support.

Correct Answer: A. efficient management

Explanation

(a)

In the diagram above, area of \(\Delta PSR = \frac{1}{2} \times |PR| \times 6\)

\(36 = \frac{1}{2} \times |PR| \times 6\)

\(36 = 3 \times |PR|\)

\(|PR| = 12 cm\)

But |PQ| = |TS| = 8cm (opp. sides of a parallelogram)

Hence, |QR| = |PR| - |PQ| = 12 - 8 = 4cm.

(b)

In the diagram above, \(\beta = 60°\) (alternate angles)

\(\tan \beta = \frac{10.65}{|QB|}\)

\(|QB| = \frac{10.65}{\tan 60}\)

= \(\frac{10.65}{1.732} = 6.149m\)

|PO| = |QB| = 6.149m (opp. sides of a rectangle)

In \(\Delta POT, \tan 45 = \frac{|TO|}{6.149}\)

\(|TO| = \tan 45 \times 6.149 = 1 \times 6.149 = 6.149m\)

|OB| = |PQ| = 10.65m (opp sides of a rectangle)

\(h = |OB| - |OT| \)

= \(10.65 - 6.149\)

= \(4.501 m \approxeq 4.50m\) (3 sig. figs)

Hence, the height of the flagpole = 4.50m

Correct Answer: B. helium

Explanation

Let's break down what diatomic means and then look at each gas:

• Diatomic gas: A gas whose stable molecules consist of two atoms of the same element bonded together. Examples include H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂.

Now let's check the options:

• A. Nitrogen: Nitrogen gas exists as N₂ (two nitrogen atoms bonded). It is diatomic.

• B. Helium: Helium is a noble gas. Noble gases exist as single, unbonded atoms because they have a full outer electron shell and are very stable. So, helium gas is He (one helium atom). It is monatomic, not diatomic.

• C. Hydrogen: Hydrogen gas exists as H₂ (two hydrogen atoms bonded). It is diatomic.

• D. Fluorine: Fluorine gas exists as F₂ (two fluorine atoms bonded). It is diatomic.

The question asks which of the gases are diatomic *except*. This means we're looking for the gas that is *not* diatomic.

Therefore, the answer is B. helium.

Correct Answer: B. prophetic tradition

Correct Answer: D. Prothallus → spermatozoid → +egg cell → leafy plant → sporangium → spore

Correct Answer: B. N35,000

Correct Answer: A. 25