Sindh Zoology 2024 Model Paper — Solved MCQs

Question 1

An injury sustained by the hypothalamus is most likely to interrupt:

Accepted Answer

C. Regulation of body temperature — C) Regulation of body temperature:The hypothalamus regulates body temperature, hunger, thirst, and other basic bodily functions. Injury to the hypothalamus could disrupt body temperature regulation, leading to hypothermia or hyperthermia.

Question 2

Even after the brain of a frog has been crushed, it still responds to a pinch on the leg by drawing it away. This act is an example

Accepted Answer

D. Simple reflex — D) Simple reflex:A simple reflex is an automatic response to a stimulus, involving a direct connection between sensory and motor neurons. This is the best answer, as the frog's response to the pinch is a simple, automatic withdrawal of its leg, which can occur even without a functioning brain.

Question 3

In humans, Parkinson's disease is linked with the deficiency of:

Accepted Answer

D. Dopamine — D) Dopamine:Dopamine is a neurotransmitter playing a crucial role in motor control, motivation, and reward processing. Parkinson's disease is indeed linked to dopamine deficiency, specifically the degeneration of dopamine-producing neurons in the substantia nigra, leading to motor symptoms like tremors, rigidity, and bradykinesia.

Question 4

All of the following are hormones of the anterior pituitary except:

Accepted Answer

C. Parathyroid hormone (PTH) — PTH is not produced by the anterior pituitary gland. Instead, it is produced by the parathyroid glands, which are located adjacent to the thyroid gland. PTH helps regulate calcium and phosphate levels in the blood and is involved in bone metabolism.

Question 5

The following hormones are responsible for the "fight-or-flight" response:

Accepted Answer

A. Epinephrine and norepinephrine — A) Epinephrine and norepinephrine:Epinephrine (adrenaline) and norepinephrine (noradrenaline) are catecholamine hormones released by the adrenal glands in response to stress, stimulating the "fight-or-flight" response, increasing heart rate, blood pressure, and energy metabolism. They prepare the body for physical activity and emergency response.

Question 6

A characteristic of territorial behavior in animals:

Accepted Answer

C. Defending an area from intruders — C) Defending an area from intruders:Defending a specific area from other animals is a hallmark of territorial behavior, as individuals or groups mark and protect their territory from others to maintain access to resources, mating opportunities, and shelter.

Question 7

The following is an example of a learned behavior in animals:

Accepted Answer

D. D) Rat navigating a Maz — , the rat would explore the box feverishly, running this way and that. occasionally, it would accidentally press a lever, and a pellet of food would appear. At first, a rat would ignore the lever and continue to move about, but soon it learned to press A 'Skinner box'. ' lever to obtain food As the animal learns by chance i.e., trial so this type of learning has been lite11 named 'trial and error learning'.

Question 8

This is an example of innate behavior except :

Accepted Answer

A. A dog learning to sit on command — A) A dog learning to sit on command:This is NOT an example of innate behavior, as dogs are not born knowing how to respond to this command. Instead, it is a learned behavior through training and reinforcement.Correct answer: A) A dog learning to sit on command

Question 9

The correct sequence of cell stage in spermatogenesis is:

Accepted Answer

D. D) Spermatogonia - Spermatocytes - Spermatids - Spermatozoa — D) Spermatogonia - Spermatocytes - Spermatids - Spermatozoa:This sequence is correct! Spermatogonia are the undifferentiated cells, which develop into Spermatocytes, then mature into Spermatids, and finally become Spermatozoa (sperm cells).

Question 10

decreased level of this hormone causes menstruation

Accepted Answer

A. Progesterone — A) Progesterone:A decrease in progesterone levels causes menstruation, as progesterone prepares the uterus for pregnancy, and a drop in levels signals the uterus to shed its lining, leading to menstrual bleeding. This is a crucial step in the menstrual cycle.

Question 11

The period of rapid physical and sexual maturation during adolescence is called:

Accepted Answer

C. puberty — C) Puberty:Puberty is the period of rapid physical and sexual maturation during adolescence, typically occurring between ages 10-14 in girls and 12-16 in boys. It is characterized by the onset of sexual development, growth spurts, and hormonal changes.

Question 12

This disorder is characterized by the presence of an extra X chromosome in males, resulting in infertility anddevelopmental abnormalities

Accepted Answer

C. Klinefelter syndrome — C) Klinefelter syndrome:Klinefelter syndrome is a genetic disorder caused by an extra X chromosome in males (XXY), resulting in infertility, developmental abnormalities, and physical characteristics such as tall stature and breast enlargement. This is the correct answer.

Question 13

Aging is characterized by:

Accepted Answer

D. decrease in the metabolic activity — The correct answer is D) decrease in metabolic activity.Aging is characterized by a gradual decline in physiological functions, including a decrease in metabolic activity. This means that the body's ability to convert energy and nutrients into vital functions, growth, and repair slows down with age.

Question 14

The only treatment in case of uremia is:

Accepted Answer

D. Kidney transplant — D) Kidney transplant:A kidney transplant is a surgical procedure that replaces a diseased or damaged kidney with a healthy one, and is the only treatment that can cure uremia. It is the best option for those with end-stage kidney disease, offering a chance to regain normal kidney function and improve quality of life.

Question 15

Apart from the conventional use, Dialysis can also be used in scenarios of:

Accepted Answer

B. Acute poisoning — B) Acute poisoning:Dialysis can be used in cases of acute poisoning to remove toxins or drugs from the blood, helping to reverse the toxic effects. This is known as hemodialysis or hemodiafiltration.

Question 16

Immunosuppressant drugs are consumed with:

Accepted Answer

C. Kidney transplant — C) Kidney transplant: Immunosuppressant drugs are necessary after a kidney transplant to prevent the body's immune system from rejecting the transplanted kidney.

Question 17

This is correct for muscle contraction:

Accepted Answer

D. Sarcomere does not shorten — D) Sarcomere does not shorten: Muscle contraction results in the shortening of the sarcomere, the basic functional unit of muscle tissue.

Question 18

Each hip bone is formed by the fusion of three bones Pubis, Ilium and:

Accepted Answer

B. Ischium — B) Ischium: The ischium is one of the three bones that fuse to form the hip bone. It forms the lower and back part of the hip bone.The fusion of the pubis, ilium, and ischium forms the hip bone, also known as the os coxae or innominate bone.

Sindh Zoology 2024 Model Paper — Solved Past Paper with Answers

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