NEET Zoology MCQs

Which of the following is wrong about Coelenterata?

They are aquatic and exclusively marine animals.

Which of the following are correctly matched with respect to their taxonomic classification?

House fly, butterfly, tsetse fly, silverfish-Insecta

One of the representatives of phylum Arthropoda is:

Silverfish

Which of the following attribute is false about Ctenophores

All germ layers are present

Which of the following is well marked in Ctenophores?

Bioluminiscence

Which of the following is true about digestion of Ctenophores?

Both 1 and 2

Which of the following is true about Ctenophores?

All of these

Which of the following developed for the first time in Annelids?

Both 2 and 3

Consider the following characters:

I. Air bladder

II. Operculum

III. Viviparity

The characters present in bony fishes include:

I and II only

Homeothermy is exhibited by:

Birds and Mammals

Which protein has been produced generating a transgenic sheep that is used for replacement therapy for individuals at risk from emphysema?

α-antitrypsin (ATT)

A genetically engineered micro-organism used successfully in bioremediation of oil spills is a species of:

Pseudomonas

Which kind of therapy was given in 1990 to a four-year-old girl with Adenosine Deaminase (ADA) deficiency ?

Gene therapy 

The two polypeptides of human insulin are linked together by

disulphide bridges

Which part of the tobacco plant is infected by Meloidegyne incognitia?

Root

Golden rice is a genetically modified crop plant where the incorporated gene is meant for

biosynthesis of

vitamin-A

In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to 

Alkaline pH of the insect gut

A single strand of nucleic acid tagged with a radioactive molecule is called

probe

The process of RNA interference has been used in the development of plants resistant to 

nematodes

Maximum number of existing transgenic animals is of 

mice

Introduction of  foreign genes for improving genotype is

genetic engineering

Restriction enzymes:

are endonucleases which cleave DNA at specific sites

A tumor inducing plasmid widely used in the production of transgenic plants is that of

Agrobacterium tumefaciens.

Electroporation procedure involves

making transient pores in the cell membrane to introduce gene constructs

cDNA probes are copied from the messenger RNA molecules with the help of

reverse transcriptase

Hirudin is

a protein produced from transgenic Brassica napus, which prevents blood clotting

The enzyme used in the polymerase chain reaction is a :

DNA dependent DNA polymerase

Identify a character that is not desirable in a cloning vector:

an inactive promoter

A cloning vector has two antibiotic resistance genes- for tetracycline and ampicillin. A foreign DNA was inserted into the tetracycline gene. Non-recombinants would survive on the medium containing :

both tetracycline and ampicillin

Elution is:

 cutting out of the separated band of DNA from the agarose gel and extracting them from the gel piece.

Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The

second sound is heard when

Semilunar valves close down after the blood flows into vessels from ventricles

Erythropoiesis starts in:-

liver

Blood pressure in the mammalian aorta is maximum during

systole ot the left ventricle

One of the factors required for the maturation of erythrocytes is 

vitamin - B₁₂

Vitamin-K is required for 

synthesis of prothrombin

The thick muscular projections on the walls of the ventricle are called

Columnae carneae

When type B agglutinogen is not present on the surface of RBC of a person, his plasma would contain ____ agglutinins.

Oxalates and citrates are used as anticoagulants in stored blood because they:

Chelate calcium ions

With respect to blood, the composition of lymph can be expressed as:

No RBc, Less or no Plateletes, Less proteins, Less calcium and phosphorus, Predominant corpuscles macrophages.

Histamine in blood is secreted by:

Basophils

The effect of CO₂ Concentration on dissocation of oxyhaemoglobin is called

Bohr’s effect

The effect of pH on dislocation of oxyhemoglobin is called

Root effect

Hb cannot take up O₂ beyond a saturation level of

97%

The red coloured, Fe Containing pigment present in the Erythrocytes is

Haemoglobin

Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at:

 Pons region of brain

The following statements refer to gas carriage by the blood. Choose the correct statement:

Haemoglobin is half saturated with oxygen when the PO₂ is about 30 mm Hg

Which of the following factors are favourable for the shifting of Oxyhaemoglobin dissociation Curve to the left side

All of these

The red coloured, Fe Containing pigment present in the Human Body is

Both A and B

How many heme group are present in Hb molecule

4

The binding of Hb with Carbon dioxide forms

Carbamino-haemoglobin

ACTH controls the secretion of:

Oxytocin helps in 

Lactation and Childbirth both

Which of the following are not steroid hormones but still do not act through second messenger system, are small, nonpolar and can be taken orally?

Which of the following glands secretes the hormone melatonin?

Which of the following regulates carbohydrate, protein and lipid metabolism in a manner opposite to that of insulin?

Glucocorticoids do not:

The development of secondary sexual characters in females is primarily controlled by:

Which hormone stimulates exocrine pancreas to secrete water and bicarbonate ions?

A hormone that has intracellular receptors would be 

A hormone that is antagonist to the parathyroid hormone is secreted from :

Select the correct match of the digested products in humans given in column I with their absorption site and mechanism in column II. 

            Column I                                   Column II

Glycine and glucose            Small intestine and active absorption

A young infant may be feeding entirely on mother's milk, which is white in colour but the stools, which the infant passes out is quite yellowish. What is this yellow colour due to ? 

Bile pigments passed through bile juice

A dental disease characterised by moltting of teeth is due to the presence of a certain chemical element in drinking water. Which of the following is that element? 

Fluorine

Anxiety and eating spicy food together in an otherwise normal human, may lead to  

indigestion

Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of 

epiglottis

Which one of the following is a protein deficiency disease?

Kwashiorkor

Rennin acts on

milk changing casein into calcium paracaseinate at 1-3 pH

In vertebrates lacteals are found in

ileum

Release of pancreatic juice is stimulated by 

Both 2 and ;3

The hormone that stimulates the stomach to secrete gastric juice is 

gastrin

Which of the following is not a major evolutionary trend seen in the evolution of horse?

Progressive increase in the number of toes

Identify the correct statement:

As the coacervates do not have lipid outer membranes and cannot reproduce, they alone could not have been the precursors of life.

Which one of the following is regarded as the direct ancestor of modern man? 

Cro-magnon man

Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?                                                                                

Overproduction, variations, constancy of population size, natural selection 

Industrial melanism is an example of 

directional selection due to smoke from industries

The homologous organs are those that show similarity in

origin

The occurrence of endemic species in South America and Australia is due to  

Continental separation

Genetic drift is change of 

gene frequency from one generation to next 

Thorn of Bougainvillea and tendril of Cucurbita are examples of  

homologous organs

Adaptive radiation refers to

evolution of different species from a common ancestor

Haemodialysis

A process of removal of urea

Which of the following nitrogenous wastes is least toxic?

1.Uric Acid

2.Urea

3.Creatinine

4.Ammonia

The amount of filtrate formed by kidneys is

125 mL/ minute

GFR is regulated by

JGA

The normal value of GFR is approximately

125 ml/min

What is used as an osmolyte in human beings to increase medullary interstitial osmolality during concentration of urine?

The blood from the glomerulus is carried away by:

Efferent arteriole

Vasa recta in cortical nephrons :

Is absent or highly reduced 

The proximal convoluted tubule is lined by the:

During concentration of urine by the human kidneys, NaCl is returned to the medullary interstitium by the:

Ascending limb of the vasa recta

Pathogens are not

   They are of four types- bacteria, fungi, viruses and protozoans

Typhoid is

Caused by a bacterium which infects small intestine by means of contaminated water and food and then migrates to other organs through blood

Which human worm infestation are we talking about?

I. In socio-economic impact on the human race, it is second only to Malaria.

II. The worm larva enters the human body by penetrating the skin

III. The worm requires snails as an intermediate host.

IV. In developing countries, it is a common cause of anaemia in children.

Bilharziasis

Malignant tertain malaria is caused by Plasmodium :

The pathogens responsible for causing elephantiasis are transmitted to a healthy person through:

Interferons are secreted by:

The type of immunity responsible for graft rejection by a recipient body is 

Which of the following is used in the production of the recombinant Hepatitits B vaccine?

The class of antibodies involved in the allergic reaction is:

The immune-deficiency becomes marked once the HIV starts destroying 

The substrate used for sperm metabolism is produced by the

seminal vesicle

The male sex accessory ducts do not include-

Ureter

Which of the following cell will undergo meiosis?

Spermatogonia

Epididymis is located in….of testis.

Posterior surface

Eyelashes in foetus are formed

By the end of 24 weeks

Separation of eye-lids of foetus is observed in

Both A and B

The structure of testis of a mammal can be identified by the presence of

Cells of Sertoli

In the vertebrates testes, for nourishment during spermiogenesis, the spermatids get attached to

Sertoli cells

In man the vas deferencs emerges from

Cauda epididymis

Follicular atresia is

Degeneration of folliciles 

The human skull has 22 bones with ..................cranial bones and ............................ facial bones

8,14

Which of the following has ATPase activity?

Head of myosin             

The ATPase activity of the myosin head is dependent on:

Calcium ions

Skeletal muscle bundles [fascicles] are held together by a common connective tissue layer called:

Fascia

The neurotransmitter released at the neuromuscular junction is:

Acetylcholine

During muscle contraction, the length of all the following gets reduced except:

A-Band

What is true about the white muscle fibers?

They depend on anaerobic process for energy

The human ribs are termed as bicephalic because:

They have two articulations surfaces on their dorsal end

The clavicle articulated with the:

Acromion of the scapula

Hypocalcemia may lead to:-

Stimulation of a muscle fibre by a motor neuron occurs at

the neuromuscular junction

Na⁺/K⁺ pump is associated with

active transport

Vitreous humor is found in vitreous chamber

Between lens and retina

Aqueous humor is

Thin watery fluid

Vitreous humor is

Transparent gel

Which one of the following statements is not correct?

photopigments

Retinal is a derivative of vitamin-C

When we move from dark to light, we fail to see for some time but soon visibility becomes normal. It is:

The brain stem does not include :

Which of the following is a major coordinating center for sensory and motor signaling for the cerebrum?

What is true of natural methods of contraception?

They are natural ways of avoiding chances of fertilization

What is the method called where the male withdraws his penis just before ejaculation?

Both (1) and (3)

Barrier methods are available for:

Both (a) and (b)

Condoms:

Prevent the ejaculated semen from entering the female reproductive tract

Condoms are barriers that cover:

Penis in male and cervix and vagina in female

Nirodh is a popular brand of:

Condom

A lady is diagnosed to have both her fallopian tubes blocked. What ART can help her to conceive a child?

IVF

Which of the following is an abortion pill?

RU486

What does RCH stand for?

Statutory ban on amniocentesis in India was necessary because:

Histamine in blood is released by

Basophils

Storage of fats is done by which type of cell in our body?

Loose connective tissue

The heart receives blood from the sinuses through

Ostia

Alary muscles play an important role in

Circulation of blood

The most abundant and widely distributed tissue in the bodies of complex animals is:

Connective

Large amoeboid cells, that are a part of our innate immune system, found in the areolar tissue are called as:

Macrophages

The cells that release heparin and histamines in the blood are:

Basophils

In cockroach, the formation of ootheca is by the secretions of:

Colleterial glands of female

Bipolar neurons are found in humans in:

Olfactory epithelium

What is incorrect regarding Periplaneta americana?

Hemolymph delivering oxygen to tissues