Correct Answer: A. Natural selection and population bottleneck.

Explanation

We see natural selection because those chickens that are entirely immune to the disease produce more offspring than those chickens who were infected but survive. The gene(s) that offers protection against contracting the disease is retained at a greater rate than the gene(s) that protects the chicken from dying of the disease. If the genetic diversity of the population is reduced generations later, this suggests that the chickens experienced a population bottleneck when the population number dropped to half of its original number.

Explanation

\(f(x) = px^{2} + qx + 2\)

\(f(-2) = p(-2)^{2} + q(-2) + 2 = 0\)

\(4p - 2q + 2 = 0\)

\(\implies 4p - 2q = -2 ... (1)\)

\(f(1) = p(1)^{2} + q(1) + 2 = 3\)

\(p + q + 2 = 3\)

\(\implies p + q = 1 ... (2)\)

From (2), \(q = 1 - p\). Substitute for q in (1).

\(4p - 2(1 - p) = -2 \implies 4p - 2 + 2p = -2\)

\(6p = 0 \implies p = 0\)

\(q = 1 - p = 1 - 0 = 1\)

\(\therefore f(x) = x + 2\)

\(f(-4) = -4 + 2 = -2\)

Correct Answer: C. pollution

Explanation

(a) Helium or Neon or Argon (i.e. all noble gases)

(b)(i) Hydrogen chloride gas

(ii) Ethyne of propyne or but-1-nye.

Explanation

(a) Computer graphics;

(i) Computer graphics are pictures and images/films created using computers. It refers to computer generated image data created with help from specialized graphical hardware and software.ORComputer Graphics is the creation of pictures/ímages/films with the help of a computerORComputer graphics is the creation, manipulation and storage of geometric objects (modeling) and their images (rendering)ORComputer graphics is an art of drawing pictures, lines, charts and other graphical images with the help of installed specialized programs on a computer/applications on a computer.ORComputer graphics are made up of number of pixels which are the smallest graphical picture or unit represented on the computer screen.ORComputer graphics refer to the representation and manipulation of image data by a computer screen.ORComputer graphics is the various technologies used to create and manipulate images in form of pixel drawn on the computer/methods for digitally synthesizing and manipulating visual content,

(ii)Specific application areas of graphics in advertising;(1) Animation/Motion pictures (2) Business card (3) Branding (4) Billboards (5) Flex creation (6) Posters (7) Modelling/Design (8) Digital marketing (9) Pitching for project (10) Print media ads (11) Tv commercials (12) Banner (13) Logo design (14) Letter-head (15) Presentation (16) Postcards (17) Info graphics (18) Brochure (19) Vehicle wraps (20) Signature and trade show display (21) Email marketing templates

(b)Computer graphic application tools;

(i) Interactive fill tool is used to create a fill dynamically by using markers in the drawing window and property bar to change the angle, midpoint and colour of an object/image.OR Interactive fill tool allows you to add the same fills to objects as the normal fill tool, but in an interactive way by setting the interactive properties. This is especially useful for fountain fills.ORInteractive fill tool is used to apply two colour effect on items.ORInteractive fill tool is used to apply fountain fills (gradients)

(ii) Texture fillis used to apply preset texture fills to objects in order to create the illusion of variety of textures such as water, clouds and stone.ORTexture fill is used to give an object natural appearanceORTexture fill is used to apply fractal fill.

(iii) Envelop toollets you shape an object by dragging the nodes or the points around the envelop.OR Envelop tool is used to change the shape of an object by applying and dragging the nodes of an envelop.OREnvelop tool allows the user to distort the shape of an object or group of objects.

(iv) Extrude toollets the user apply the illusion of depth to objects.ORExtrude tool is used to project surfaces from an object to give it a 3-dimensional shadow/appearanceORExtrude tool is used to a apply a 3D effect to objects in order to create the illusion of depth.ORExtrude tool is used to apply 3D modelling.ORExtrude tool is used to duplicate properties such as points, lines and polygon.

(c)Tools that are used to create a background that is faded from light blue to white;(i) Create background faded from light blue to white; (a) Interactive tool (b) Fountain fill tool (c) Transparency tool

(ii) Fill an object with two colours that blend form one to another; (a) Interactive tool (b) Fountain fill tool (c) Two colour pattern fill

Correct Answer: B. Ummi's admission and marriage

Correct Answer: A. internet connection

Correct Answer: D. Portugal

Correct Answer: C. Ahab might own his property

Correct Answer: C. More/than