Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Fat, prior to its oxidation associate with

  • cyclic AMP

  • Co- A

  • GMP

  • ATP


B.

Co- A

The respiratory decomposition of fatty acids is known as beta oxidation, which occurs in liver and adipose tissue. Activation of fatty acids takes place, then dehydrogenation of activated fatty acid takes place. It is followed by hydration. The β-hydroxyl acyl derivative is converted to β-keto derivative, which then reacts with Co-A. And it leads to oxidation.


12.

X- rays are used in 

  • ECG

  • EEG

  • CT- scan

  • Endoscopy


C.

CT- scan

X-rays are used in CT-scan (computed tomographic scanning). It uses X-rays but employs a computer for reconstructing the image instead of directly recording it on a photographic film. This technique is used in the diagnosis of diseases of brain, spinal cord, chest, etc. It is also useful in detecting tumors.

ECG or Electrocardiogram is a medical test that detects cardiac (heart) abnormalities by measuring the electrical activity generated by the heart as it contracts.

EEg or Electroencephalogram is a non- invasive test that records electrical patterns in your brain. It is used to help diagnose conditions such as seizures, epilepsy, head injuries, dizziness etc.

Endoscopy helps in identifying inflammation, ulcers and tumors. It is more accurate than X- rays for detecting abnormal growths such as cancer and for examining the inside of the upper digestive system.


13.

The thin filaments of a muscle fibre are made up of

  • actin, troponin, tropomyosin

  • actin, troponin

  • myosin, troponin

  • actin, tropomyosin


A.

actin, troponin, tropomyosin

The thin filaments of a muscle fibre are made up of actin, troponin and tropomyosin. One thin filament probably contains 300-400 actin molecules, about 50 tropomyosin and 50 troponin. It is said that tropomyosin plays a vital role in sensitizing the contractile proteins (actin and myosin) to calcium ions.


14.

Heparin is secreted by

  • mast cell

  • alveolar cell

  • plasma cell

  • goblet cell


A.

mast cell

Heparin is released from mast-cells. It is an anticoagulant which prevents activation of prothrombin. 

Alveolar cells secrete pulmonary surfactant to lower the surface tension of water and allows the membrane to seperate, therefore increasing its capability to exchange gases.

Plasma cells are WBCs or White Blood Cells secrete large volumes of antibodies.

Goblet cells secrete mucus in order to protect the mucous membranes where they are found.


15.

Deoxyribonuclease and ribonuclease are secreted by

  • liver

  • stomach

  • pancrease

  • kidney


C.

pancrease

Deoxyribonuclease and ribonuclease are secreted by pancreas. These enzymes act on DNA and RNA and convert them to deoxyribonucleotides and ribonucleotides, respectively. The optimum pH required by pancreatic juice to secrete these enzymes is 7-8 (alkaline).


16.

Schwann cell is found around

  • axon

  • cyton

  • dendrite

  • dendron


A.

axon

All multicellular animals contain elongated nerve cells, called neurons. Each neuron has a cell body, axon and smaller processes called dendrites. An axon is the process of a nerve cell that carries impulses away from it. It runs parallel to one another and each is surrounded along its whole length by series of Schwann cells. They may have myelin sheath.


17.

Haemodialysis helps in patient having

  • uremia

  • anaemia

  • diabetes

  • goitre


A.

uremia

Haemodialysis helps the patient suffering from uremia. In this condition, the excretory products (i.e., urea) go on accumulating in blood. This happens due to kidney, failure. In haemodialysis, the patients blood is passed through disposable dialyser and is then returned to body by the intravenous route.


18.

Which part of retina consists of only cones?

  • Fovea centralis

  • optic nerve

  • Blind spot

  • Orasmata


A.

Fovea centralis

Fovea centralis is a small, central pit composed of closely packed cones in the eye. Ability for vision is highest in the fovea.

Optic nerve is a bundle of more than 1 million nerve fibres that carry visual messages. It is composed of retinal ganglion cell axon and glial cells.

Blind spot is a small portion of the visual field of each eye that corresponds to the position of the optic disk within the retina. There are no photoreceptors in the optic disk and therefore, no image detection takes place.


19.

Reflex action involves

  • spinal cord

  • cerbellum

  • medulla oblongata

  • optic lobe


A.

spinal cord

Reflexes are classified as the spinal reflexes and the cranial reflexes.

Spinal reflexes are so called because their basic neural path leads through spinal nerves and spinal cord. Reflexes at the spinal level have the purpose of removing the animal from harmful stimuli.


20.

In which part of mitochondria does ATP synthesis occur?

  • F1

  • F0

  • Cristae

  • Inner membrane of mitochondria


A.

F1

During the oxidation process (occurs in inner mitochondrial membrane during electron transport system), enormous amount of free energy is released, some of which is utilised by inner membrane sub units or F1 particles containing three coupling factors and ATP enzyme, in the synthesis of ATP molecules.