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 Multiple Choice QuestionsMultiple Choice Questions

1.

Water-soluble pigments found in plant cell vacuoles are

  • chlorophylls

  • carotenoids

  • anthocyanins

  • xanthophylls


C.

anthocyanins

Anthocyanins are water soluble pigments and appear red, purple depending on pH. 

2040 Views

2.

Mitochondria and choloroplast are :
I. semi-autonomous organelles.
II. formed by division of pre-existing  organelles and they contain DNA but lack protein synthesizing machinery. 

  • II is true but I is false

  • I is true but II is false

  • Both I and II are false

  • Both I and II are correct


B.

I is true but II is false

Mitochondria and chloroplast have DNA and are capable of self-replication, thus they are semi-autonomous bodies

The organelles do synthesize some of protein and hence they have the protein synthesizing machinery. However, most of the proteins are derived from the nucleus. 

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3.

Pigment-containing memberanous extensions in cyanobacteria are

  • heterocysts

  • basal bodies

  • pneumatophores

  • chromatophores


D.

chromatophores

Cyanobacteria contain chlorophyll but the chlorophyll is not located in chloroplasts, rather it is found in chromatophores, infolding of the plasma membrane, where photosynthesis is carried out.
Heterocysts are specialised nitrogen -fixing cells formed from a centriole and a short cylindrical array of microtubules.
Pneumatophores are lateral roots that grow upward for varying distance and function as the site of oxygen intake for the submerged primary roots.

735 Views

4.

One of the major components of cell wall of most fungi is

  • peptidoglycan

  • cellulose

  • hemicellulose

  • chitin


D.

chitin

Fungi cell wall is made of chitin. 

1596 Views

5.

A complex of ribosomes attached to a single strand of RNA is known as 

  • Polymer

  • Polypeptide

  • Okazaki's fragment

  • Polysome


D.

Polysome

A chain of ribosomes attaches to a single mRNA is called polysome or polyribosomes.

2077 Views

6.

The Golgi complex plays a major role

  • in trapping the light and transforming it into chemical energy

  • in digesting proteins and carbohydrates

  • as energy transferring organelles

  • in post-translational modification of proteins and glycosidation of lipids


D.

in post-translational modification of proteins and glycosidation of lipids

Golgi complex plays a major role in post-translational modification of proteins and glycosidation of lipids. Chloroplasts contain chlorophyll, which traps light and transform into chemical energy. Lysosomes are involved in digesting protein, fats and carbohydrates. Mitochondria are energy transferring organelles.

828 Views

7.

A major site for synthesis of lipids is 

  • RER

  • SER

  • symplast

  • nucleoplasm


B.

SER

The Smooth Endoplasmic Reticulum (SER) is the major site for synthesis of lipids. RER is actively involved in protein synthesis and secretion. Nucleoplasm is the site for active ribosomal RNA synthesis. Symplast is the system of interconnected protoplast through, which water movement occurs.

606 Views

8.

Which one of the following cell organelles is enclosed by a single membrane?

  • Chloroplasts

  • Lysosomes

  • Nuclei

  • Mitochondria


B.

Lysosomes

All others except lysosomes have double membrane.

1580 Views

9.

In a chloroplast the highest number of protons are found in

  • lumen of thylakoids

  • inter membrane space

  • antennae complex

  • stroma


A.

lumen of thylakoids

Proton concentration is higher in the lumen of thylakoid due to photolysis of water. Hpumping and NADP reductase activity which occurs in stroma of the chloroplast.

1836 Views

10.

A phosphoglyceride is always made up of

  • only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

  • only an unsaturated fatty acid esterified to glycerol molecule to which a phosphate group is also attached

  • a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

  • a saturated or unsaturated fatty acid esterified to a phosphate group, which is also attached to a glycerol molecule


C.

a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached

A fat is formed of two kinds of smaller molecules, i.e., glycerol and fatty acids. In making a fat three fatty acid molecules each join to glycerol by an ester linkage. A fatty acid has a long carbon skeleton, usually 16 or 18 carbon atom in length. It there is no double bonds between carbon atoms composing the chain, then as many hydrogen atoms as possible are bonded to the carbon skeleton.

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