Sindh Zoology 2022 — Solved MCQs

Question 1

It is not way of obtaining heat by organism:

Accepted Answer

D. Sweating — The answer of this question will be Option D, that is, sweating. By sweating, organisms does not obtain heat rather it helps to loss heat. When the temperature is very high, then our body starts sweating so as to keep our body cool and loss the excess heat from the body.

Question 2

The exoskeleton in cockroach is made up of:

Accepted Answer

C. Chitin — The body is covered with a hard outer skeleton called exoskeleton made up of chitin that provides shape to the body of cockroaches.

Question 3

Parthenogenesis requires:

Accepted Answer

A. One parent — Parthenogenesis, a reproductive strategy that involves development of a female (rarely a male) gamete (sex cell) without fertilization. It occurs commonly among lower plants and invertebrate animals (particularly rotifers, aphids, ants, wasps, and bees) and rarely among higher vertebrates.

Question 4

Contraction time in human eye muscle is:

Accepted Answer

C. 0.01 second — Fastest-reacting muscle in the body is the Orbicularis oculi: the muscle that encircles the eye and closes the eyelid. It contracts in less than 0.01 second.

Question 5

Cytoplasmic localization is consequence of:

Accepted Answer

C. Cleavage — After third cleavage , the rest of the cleavages are irregular and completely delimited cells are formed all over the germinal disc which is termed as blastoderm. This outcome of cleavage called cytoplasmic localization helps seal the developmental fate of each cell's descendants.

Question 6

The approximate number of human genes is:

Accepted Answer

C. 20,000 to 25,000 — An international research effort called the Human Genome Project, which worked to determine the sequence of the human genome and identify the genes that it contains, estimated that humans have between 20,000 and 25,000 genes.

Question 7

Number of tail vertebrae in Archaeopteryx were:

Accepted Answer

C. 23 — Almost all of the 23 vertebrae found in the tail of Archaeopteryx can be identified in modern birds, although reduced in size with some added to either the sacrum or to the pygostyle.

Question 8

Night blindness is due to the deficiency of:

Accepted Answer

C. Vitamin A — Night blindness is one of the first signs of vitamin A deficiency. In its more severe forms, vitamin A deficiency contributes to blindness by making the cornea very dry, thus damaging the retina and cornea.

Question 9

These animals retain urea in their body to maintain hypertonic osmotic pressure

Accepted Answer

A. Mackerel Fish — Since fishes retain urea for osmoregulation and Mackerel Fish is marine so this is correct option.

Question 10

It is a bone of pectoral girdle:

Accepted Answer

B. Scapula — To sum up, the pectoral girdle is made up of two bones, scapula and clavicle. It connects the upper limb to the trunk. The Pectoral girdle is only connected by ligaments to the vertebral column so there is more range of movement compared to the pelvic girdle.

Question 11

Deficiency of this neurotransmitter causes Parkinson's disease:

Accepted Answer

B. Dopamine — Dopamine deficiency means having a low level of dopamine. Low dopamine levels are linked with certain health conditions like Parkinson's disease or depression. It may also make you more susceptible to taking risks or developing addictions.

Question 12

The end of fertility in human female is called

Accepted Answer

B. Menopause — On average, a woman hits menopause between the ages of late 40s to early 50s. However, ovulation can stop before this 12 months phase as well, or can happen very irregularly for a few months leading up to these 12 months. There is a period of time before officially hitting menopause, called “perimenopause”.

Question 13

The sympathetic nervous system in humans consists of:

Accepted Answer

A. Thoracic and Lumber Region — The sympathetic nervous system extends from the thoracic to lumbar vertebrae and has connections with the thoracic, abdominal, and pelvic plexuses

Question 14

It is a multifactorial defect

Accepted Answer

A. Asthma — Rather, asthma is a polygenic, multifactorial disorder, which means that many factors contribute to its development. These factors are both genetic and environmental; accordingly, the combined action of several genes interacting with one another and with environmental factors causes the condition

Question 15

These are postulates of Lamarck's theory of evolution except:

Accepted Answer

A. Natural selection — This is the postulate of Darwin theory of natural selection.

Question 16

This hormone requires a second messenger.

Accepted Answer

C. Insulin — Lately two molecules have been proposed as second messengers transducing the insulin signal into the target cell. One is a phospho-oligosaccharide/inositolphosphoglycan and the other is diacylglycerol, both deriving from the same plasma membrane glycolipid, which is hydrolysed in response to insulin treatment.

Question 17

The study, of abnormal development is called

Accepted Answer

A. Teratology — Teratology is the branch of biology, which deals with these abnormal developments and causes for such developments.

Question 18

Sound higher than the tolerable level is

Accepted Answer

A. 85 decibels — Levels and sources of damaging noise include: 85 – 100 decibels: For example, a hair dryer, blender, power lawn mower, forklift, or subway train. 100 – 120 decibels: For example, a bulldozer, impact wrench, or motorcycle. 120 – 140 decibels: Such as, a rock concert, auto racing, or a hammer pounding a nail.

Question 19

Death of cell due to injury is called:

Accepted Answer

B. Necrosis — Necrosis is the death of body tissue. It occurs when too little blood flows to the tissue. This can be from injury, radiation, or chemicals. Necrosis cannot be reversed.

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