Correct Answer: C. prevent ionization of water molecules

Explanation

(a) Name of pests

I Grasshopper

II Weevil

III Cotton stainer

(b)Life cycle of the pest labelled I (Grasshopper)

• The female lays eggs on the underside of leaves/ dig hole in the soil / decaying wood;
• The eggs hatch into nymphs;
• The nymphs move to farms and feed on cassava leaves or other shrubs till they become adults;
• The nymph moults five times before becoming adult grasshopper;
• It undergoes incomplete metamorphosis.

(c)Damages caused by the pest labelled III (Cotton stainer) on crops

• Transmits diseases;
• Causes leaf distortion;
• Pierces and sucks sap from crop tissues;
• Reduces the quality of bolls;
• Produces saliva which is toxic to crops;
• Wounds caused by the pest to plants leads to secondary infection.

(d)Ways of controlling the pest labelled IV (Bird)

• Use of avicides;
• Drumming or noise making on the farm;
• Use of cage traps;
• Use of scarecrow or bird scarers;
• Shooting with catapult/sling;
• Fencing/screening farms in greenhouse;
• Destruction of the birds’ nests

Correct Answer: D. Co-operatives

Correct Answer: D. it provides means for the variation of chromosome number from generation to generation

Correct Answer: C. Zechariah

Correct Answer: D) 16cm^3

Correct Answer: B. No other god could deliver like him

Correct Answer: D. -2 + 2\(\sqrt2\) m

Explanation

Perimeter of a triangle = sum of all sides

⇒ \(P = y + x + x = 2\)

⇒ \(y + 2x = 2\)

⇒ \(y= 2 - 2x\)-----(i)

Using Pythagoras theorem

\(y^2 = x^2 + x^2\)

⇒ \(y^2 = 2x^2\)

⇒ \(y = \sqrt2x^2\)

⇒ \(y = x\sqrt2\)-----(ii)

Equate \(y\)

⇒ \(2 - 2x = x\sqrt2\)

Square both sides

⇒ \((2 -2x) ^2 = (x\sqrt2)^2\)

⇒ \(4 - 8x + 4x^2 = 2x^2\)

⇒ \(4 - 8x + 4x^2 - 2x^2 = 0\)

⇒ \(2x^2 - 8x + 4 = 0\)

⇒ \(x = \frac{-(-8)\pm\sqrt(-8)^2 - 4\times2\times4}{2\times2}\)

⇒ \(x = \frac{8\pm\sqrt32}{4}\)

⇒ \(x = \frac{8\pm4\sqrt2}{4}\)

⇒ \(x = 2\pm\sqrt2\)

⇒ \(x = 2 + \sqrt2\) or \(2 - \sqrt2\)

∴ \(x = 2 - \sqrt2\) (for \(x\) has to be less than its perimeter)

∴ \(y = 2 - 2x = 2 - 2(2 - \sqrt2) = -2 + 2 \sqrt2\)

∴ The length of the longer side = -2 + 2\(\sqrt2\)m

Correct Answer: B. extended in meaning

Correct Answer: C) Bowman's capsule

Explanation

In our bodies, the kidney has an important role in removing waste products and excess fluids from the blood. One of the processes that occur in the kidney is ultrafiltration. This process happens in a structure called the Bowman's capsule, which is located at the beginning of the functional unit of the kidney, called the nephron. During ultrafiltration, blood from the renal artery enters the glomerulus, a network of small blood vessels in the Bowman's capsule. The glomerulus acts as a filter, allowing small molecules like water, glucose, and salts to pass through, while retaining larger molecules like proteins and blood cells in the bloodstream. The filtered fluid, called the filtrate, then moves from the Bowman's capsule into the rest of the nephron for further processing and reabsorption. From the given options, the correct answer to the question is option C, Bowman's capsule. The loop of Henle is another structure in the nephron that is involved in the reabsorption of water and electrolytes, but not in ultrafiltration. The renal vein is a blood vessel that carries filtered blood away from the kidney. The pelvis and pyramid are structures in the kidney that are involved in the transport of urine.