Kpk Biology 2016 — Solved MCQs

Question 1

Ozone layer is situated in:

Accepted Answer

B. Atmosphere — The atmosphere is the layer of gases surrounding Earth. The ozone layer is situated within the atmosphere, specifically in the stratosphere.

Question 2

Ancher culture is also called .......... culture.

Accepted Answer

B. Pollen — Anther culture is also referred to as Pollen Culture. This technique involves the in vitro culture of pollen grains to produce haploid plants. It's often used in plant breeding and genetic research.

Question 3

Succession which start on a dry land is:

Accepted Answer

B. Psammosere — This refers to succession starting on sand dunes or other sandy areas.

Question 4

Innate behavior is all but:

Accepted Answer

A. Flexible — Innate behaviors are often considered inflexible because they are instinctual and not learned. They are typically predictable responses to specific stimuli, rather than adaptable behaviors.

Question 5

An erythroblast is the immediate precursor of a normal:

Accepted Answer

D. Erythroblast — Erythroblasts are the immediate precursor cells of red blood cells (erythrocytes). They are produced in the bone marrow through a process called erythropoiesis. Erythroblasts mature and undergo several stages of development to become mature red blood cells, which transport oxygen from the lungs to the body's tissues and remove carbon dioxide from the body's tissues to the lungs for exhalation.

Question 6

Acrosome contains ........ enzyme that enables the sperm to penetrate and enter in egg.

Accepted Answer

C. Hyaluronidase — This is the correct enzyme. Hyaluronidase is an enzyme present in the acrosome of sperm cells. It helps the sperm to penetrate through the protective layers surrounding the egg by breaking down hyaluronic acid, which is a component of those layers.

Question 7

Nicotine is an alkaloid mainly found in ........ leaves, also found in toher Plants of family Solanaceas.

Accepted Answer

C. Tobacco — Nicotine is primarily found in tobacco leaves. It's the main psychoactive ingredient in tobacco products like cigarettes, cigars, and chewing tobacco.

Question 8

Blunt ends are produce by Restriction enzymes:

Accepted Answer

D. Sma 1 — SmaI is a type II restriction enzyme that recognizes the sequence CCCGGG and cuts between the two C's and two G's, producing "blunt" ends without any overhangs.

Question 9

The cells of bone that help to eat away old bone is:

Accepted Answer

B. Osteoclasts — Osteoclasts are cells responsible for bone resorption, meaning they break down and absorb old bone tissue. They are derived from the same cells as macrophages and are essential for bone remodeling and the maintenance of calcium levels in the body.

Question 10

Inheritance of skin colour in man is controlled by eight pairs of genes which are:

Accepted Answer

D. Multiple genes — Polygenic inheritance occurs when a trait is controlled by multiple genes, each with small additive effects. Skin color is a classic example of polygenic inheritance, where multiple genes contribute to the overall phenotype. Each gene may have multiple alleles, and the combination of alleles from these multiple genes determines the range of skin colors observed in a population.

Question 11

Sprain is an injury of the:

Accepted Answer

A. Ligament — Sprain is related to the mild to severe grade of stretching or tearing of a ligament that holds a joint's bones together.

Question 12

Standard temperature for Primer annealing in PCR:

Accepted Answer

C. 72o C — The temperature is raised up to 72°C be which is the optimal temperature for DNA polymerase to extend the primer and synthesize a new complementary strand of DNA.

Question 13

Hyperpolarization is caused due to:

Accepted Answer

A. Efflux of K+ — Hyperpolarization can occur when there is an efflux (outward movement) of positively charged ions such as potassium (K+) from the cell. This efflux leads to an increase in the negative charge inside the cell, causing hyperpolarization.

Question 14

The bone disorder that lead to loss of normal spinal function and structure is:

Accepted Answer

D. Spondylosis — Spondylosis, also known as spinal osteoarthritis, is a degenerative disorder that affects the spine, particularly the intervertebral discs and the facet joints. Over time, it can lead to the loss of normal spinal function and structure due to the breakdown of the discs and the development of bone spurs. This can result in symptoms such as stiffness, pain, and reduced mobility.

Question 15

Kidney health is described in terms of:

Accepted Answer

C. Rate of filtration — This is a key indicator of kidney health. The rate of filtration refers to the rate at which blood is filtered by the kidneys to remove waste products and excess substances while retaining essential components. It's often assessed using measures like GFR, which indicates how well the kidneys are filtering waste from the blood.

Question 16

Learning behaviour is all except:

Accepted Answer

A. heritable — This means the behavior is passed down genetically. It's not determined by an organism's genes but rather by its environment and experiences. Learning behavior involves extrinsic influences, progresses over time, can sometimes lead to stereotypic behaviors under certain conditions but are non heritable.

Question 17

Embryo implants in the ....... of the uterus.

Accepted Answer

C. Endometrium — Progesterone promotes the growth and development of blood vessels and glands in the endometrium, making it a suitable environment for a fertilized egg to implant and develop into an embryo.

Question 18

The diameter of myofibrils is about:

Accepted Answer

D. 1-2 mm — When viewed in high magnification, each muscle fibre is seen to contain a large number of myofibrils 1-2 mm in diameter that run in parallel fashion and extend entire length of the cell.

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