NEET Test 172

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NEET Test 172

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Weekly Quiz Competition

Question 1
4 / -1

Addition of iodine in the diet is necessary for treating:

A
To treat hyperthyroidism

B
To treat hypothyroidism

C
To regulate the 24 -hour (diurnal) rhythm of our body

D
To reduce the loss of water through urine (diuresis)

Solution

The thyroid hormone is responsible for metabolism and metamorphosis. lodine is an element of the thyroid hormone, the deficiency of which leads to hypothyroidism. This happens because iodine is needed for the production of the hormone thyroxine. Hypothyroidism during pregnancy causes defective development and maturation of the growing baby leading to stunted growth (cretinism), mental retardation, low intelligence quotient, abnormal skin, deaf-mutism, etc. In adult women, hypothyroidism may cause menstrual cycle to become irregular.
Question 2
4 / -1

Which among the following statements are correct?

A
All the biological names have their origin in Latin.

B
The first word in a biological name represents the species and the next represents genus.

C
Canis lupus familaris is the binomial nomenclature of a dog.

D
Panthera Tigress is the binomial nomenclature of a tiger.

Solution

'The first word in a biological name represents the species and the next represents genus.' is the correct statement.

Biological names need not have their origin in Latin but need to be Latinized or to be derived from Latin irrespective of the origin. Also in binomial nomenclature the generic epithet should start with a capital letter followed by the specific epithet starting with a small letter.
Question 3
4 / -1

Which of the following statements regarding contraception is false?

A
Female condoms are generally made up of nitrile, latex, or polyurethane.

B
The Pearl Index measures the efficacy of contraception.

C
Contraceptive sponges integrate a barrier with a spermicide.

D
Combined oral contraceptive pills contain natural estrogens and progestins.

Solution

Contraception aims to prevent pregnancy. A woman can get pregnant if a man's sperm reaches one of her eggs. Contraception tries to stop this from happening by keeping the egg and sperm apart, stopping egg production. Oral contraceptives (birth control pills) are used to prevent pregnancy.

Estrogen and progestin are two female sex hormones. Combinations of estrogen and progestin work by preventing ovulation (the release of eggs from the ovaries).
Question 4
4 / -1

Long filamentous threads protruding at the end of a young cob of maize are:

A
anthers

B
styles

C
ovaries

D
hairs

Solution

In cob of maize, each ovary has a long silky (hairy) style, called as corn silk. Collectively these styles protrude at the end of a young cob. The grains are formed on the cob which remain covered by the leafy bracts. It provides a female flower surface to which pollen grains adhere. The corn silk tip is the stigma.

Maize cobs are a by-product of the maize crop, consisting of the central fibrous rachis of the female inflorescence( the maize ear).
Question 5
4 / -1

Vegetative propagation in Pistia occurs by:

A
Offset

B
Runner

C
Sucker

D
Stolon

Solution

In Pistia (water lettuce) vegetative propagation occurs by offset where one intemode long runners grows horizontally along the soil surface and gives rise to new plants either from axillary or terminal buds.
Question 6
4 / -1

In alveoli of the lungs, the air at the site of gas exchange is separated from the blood by:

A
Alveolar epithelium only

B
Alveolar epithelium and capillary endothelium

C
Alveolar epithelium capillary endothelium and tunica adventitia

D
Alveolar epithelium capillary endothelium a thin layer of tunica media and tunica adventitia

Solution

Alveoli are the site of the respiratory exchange of gases. Oxygen from the alveolar air diffuses through the alveolar epithelium and the capillary endothelium into the capillary blood and carbon dioxide diffuses in the opposite direction.
Question 7
4 / -1

In a common base mode if the collector and base current are 1.95 mA and 0.5 mA, then the emitter current will be:

A
2.0 mA

B
1.90 mA

C
2.45 mA

D
0.05 mA

Solution
Question 8
4 / -1

Analyze the picture given below and fill the labeling (a), (b) and (c).

A

B

C

D

Solution

The frontal lobe of the cerebrum controls all the voluntary activities of the body. It is the seat of memory, will, intelligence, reasoning, learning, behavior and movement. The temporal lobe is responsible for sight and the brain stem controls the breathing and respiration, regulates the heartbeat and maintains the temperature.
Question 9
4 / -1

Which of the following insectivorous plants is a rootless angiosperm?

A
Aldrovanda

B
Dionaea

C
Utricularia

D
Drosera

Solution

Utricularia, commonly and collectively called the bladderworts, is a genus of carnivorous plants consisting of approximately 233 species. They occur in fresh water and wet soil as terrestrial or aquatic species across every continent except Antarctica
Question 10
4 / -1

In the sodium fusion test of organic compounds (Lassaigne`s test), the nitrogen of the organic compound is converted into

A
Sodamide

B
Sodium cyanide

C
Sodium nitrite

D
Sodium nitrate

Solution

The sodium fusion test is also known as Lassaigne’s Test popularly as it was developed by J. L. Lassaigne.

Nitrogen, Sulphur, and halogens present in organic compounds are detected by Lassaigne’s test.

The principle is that, in doing so, Na converts all the elements present into ionic form. A variety of techniques has been described.