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 Multiple Choice QuestionsMultiple Choice Questions

11.

DNA remains absent in :

  • chloroplast

  • nucleus

  • peroxysomes

  • chromosome


C.

peroxysomes

DNA remains absent in peroxisomes. It is involved with photorespiration whereas nucleus, chloroplast, mitochondria and chromosomes contain DNA.


12.

What type of enzyme are present in lysosome

  • ATPase

  • Hydrolytic

  • Lyase

  • None of these


B.

Hydrolytic

Lysosomes or suicidal bags are bounded by single unit membrane. It contains hydrolytic enzymes which help to digest the nucleic acids, proteins and polysaccharide etc. (i.e., extracellular material). It also helps in autolysis.


13.

Phospholipids are

  • amphipathic

  • hydrophobic

  • amphibolic

  • none of these


A.

amphipathic

The phospholipid is a bipolar molecule having long fatty acid called hydrophobic tail (water hating) or non-polar end. Another is hydrophillic (water loving) or polar end, hence, it is amphipathic in nature


14.

Arachidonic acid is

  • non-essential fatty acid

  • essential fatty acid

  • poly unsaturated fatty acid

  • both 'b' and 'c'


D.

both 'b' and 'c'

Arachidonic acid is polyunsaturated (i.e., have more than one double bond) and essential fatty acids. Essential fatty acids cannot be synthesised by the body of animal and has to be taken from outside to fulfil the body requirement. Linoleic acid and linolenic acid are also essential fatty acids.


15.

Plant cell is differ from animal cell because of

  • the presence of cell wall and absence of chlorophyll in plant cell

  • the presence of cell wall and chlorophyll in plant cell

  • the absence of cell wall and presence of chloroplast in animal cell

  • the absence of cell wall and presence of chlorophyll in plant cell


B.

the presence of cell wall and chlorophyll in plant cell

Plant cell differs from animal cell in having cell wall, chloroplast, and plasmodesmata.


16.

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.


17.

The basic unit of chitin is

  • N-acetyl glucosamine

  • glucose

  • galactose

  • fructose


A.

N-acetyl glucosamine

The chitin (polyglycosamine) is an acetate of mucopolysaccharide called glycosamine which is formed by the combination of polysaccharide with small peptide molecules. The basic unit (monomer) of chitin is N-acetylglucosamine, monomers are joined by 1-4 β linkages.


18.

Many cells function properly and divide mitotically even though they do not have

  • plasma membrane

  • cytoskeleton

  • mitochondria

  • plastids


D.

plastids

The presence of plastid is a feature of plant cells but animal cells are devoid of them. Even then they function properly and divide mitotically similar to plant cells.


19.

The 'power house' of cell is :

  • nucleus

  • golgi body

  • mitochondria

  • chloroplast


C.

mitochondria

Mitochondria is the site of oxidative phosphorylation where energy is produced in the form of ATP from oxidation of food material (fat, carbohydrate and proteins) that is why mitochondria is called as 'power house' of cell.


20.

In bacteria respiration occurs in

  • cytoplasmic membrane

  • mitochondria

  • nuclear membrane

  • endoplasmic reticulum


A.

cytoplasmic membrane

In bacteria, respiration occurs in cytoplasmic membrane bacteria is a prokaryotic cell (true nucleus and membrane bounded organelle are absent).