NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Chitin is a

  • polysaccharide

  • nitrogenous polysaccharide

  • lipoprotein

  • protein



Chitin is a polysaccharide comprising chains of N-acetyl-D-glucosamine, a derivative of glucose. Chitin is structurally very similar to cellulose and serves to strengthen the supporting structure of invertebrates. It also occurs in fungi.


Which one is true for ATP?

  • ATP is a prosthetic part of an enzyme

  • ATP is an enzyme

  • ATP is the organic ions of enzyme

  • ATP is a coenzyme


ATP is a coenzyme

Adenosine-triphosphate (ATP) is a multifunctional nucleotide used in cells as a coenzyme. It is often called the molecular unitof currency of intracellular energy transfer. ATP transports chemical energy within cells for metabolism. It is produced by photophosphorylation cellular respiration and used by enzymes and structural proteins in many cellular processes including biosynthetic reactions, motility and cell division.


Chloroplast dimorphism is a characteristic feature of

  • plants with Calvin cycle

  • C4 -plants

  • all plants

  • only in algae


C4 -plants

Chloroplast dimorphism means there are two different types of chloroplasts. It is mainly observed in C4 plants and is characteristic feature of these plants. Two types of chloroplasts are:

  1. Chloroplast with grana
  2. Chloroplast without grana and surrounded to the vascular bundle.


When the cell is fully turgid, its

  • DPD = OP

  • DPD = zero

  • WP = TP

  • OP = zero



A fully stretched cell wall is exerting a restraining inward force called wall pressure on cell contents. This wall pressure is balanced by an equal but oppositely directed-force called turgor pressure in the cell contents, and when the cell wall can stretch no further, the cell is said to be fully turgid. Hence, when the cell is fully turgid its,

Wall Pressure (WP) = Turgor Pressure (TP).


Interfascicular cambium is a

  • primary meristematic tissue

  • primordial meristem

  • type of protoderm

  • secondary meristematic tissue


secondary meristematic tissue

The meristem that occurs in the mature regions of roots and shoots of many plants, particularly those that produce woody axis and appea later than primary meristem is called the secondary or lateral meristem. They are cylindrical meristems. Fascicular vascular cambium, interfascicular cambium and cork cambium are examples of lateral meristems. These are mainly responsible for producing secondary tissues.


Purines possess nitrogen at

  • 1, 2, 4 and 6 position

  • 1, 3, 5 and 7 position

  • 1, 3, 7 and 9 position

  • 1, 2, 6 and 8 position


1, 3, 7 and 9 position

Purine is an organic nitrogenous base, sparingly soluble in water, that gives rise to a group of biologically important derivatives. Purine possess nitrogen at 1, 3, 7 and 9 position.


Mitochondria are semiautonomous as they possess

  • DNA

  • DNA and RNA

  • DNA, RNA and ribosomes

  • Protein


DNA, RNA and ribosomes

Each mitochondrion is a double membrane bound structure with the outer membrane and the inner membrane dividing its lumen distinctly into two aqueous compartments, ie, the outer compartment and the inner compartment. The inner compartment is called the matrix. The matrix possesses single circular DNA molecule, a few RNA molecules, ribosomes (70S) and the components required for the synthesis of proteins.


Quiescent centre is found in plants at

  • root tip

  • cambium

  • shoot tip

  • leaf tip


root tip

Quiescent centre is a region in the apical meristem of a root where cell division proceeds very slowly or not at all. Although, the cells are capable of resuming meristematic activity should tissue surrounding them to be damaged.


Thylakoids occur inside

  • mitochondria

  • chloroplast

  • Golgi apparatus

  • endoplasmic reticulum



A thylakoid is a membrane bound compartment inside the chloroplasts and cyanobacteria. They are the site. of the light dependent reactions of photosynthesis.


Which of the cell organelle lacks membrane?

  • Mesosome

  • Mitochondria

  • Ribosome

  • Liposome



Ribosomes are the granular structures, composed of ribonucleic acid (RNA) and proteins acid and hence,  are not surrounded by any membrane. They were first observed by George Palade (1953) under the electron microscope as dense particles. The eukaryotic ribosomes are 80S, while the prokaryotic ribosomes are 70S.