Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple Choice Questions

181.

Viroids differ from viruses in having :

  • DNA molecules with protein coat

  • DNA molecules without protein coat

  • RNA molecules with protein coat

  • RNA molecules without protein coat


D.

RNA molecules without protein coat

Biosynthetic stage for synthesis of product in recombinant DNA technology is called upstreaming process while after completion of biosynthetic stage, the product has to be subjected through a series of processes which include separation and purification are collectively referred to as downstreaming processing.

1588 Views

182.

Identify the accurate explanation of mesosome. It is

  • a specialised structure of prokaryotic cell formed by extension of plasma membrane into the cytoplasm

  • the middle layer of the prokaryotic cell wall

  • the organelle of eukaryotic cell which helps in lipid synthesis

  • the middle layer of eukaryotic cell wall.


A.

a specialised structure of prokaryotic cell formed by extension of plasma membrane into the cytoplasm


183.

Which of the following organisms are known as chief producers in the oceans?

  • Dinoflagellates

  • Diatoms

  • Euglenoids

  • Cyanobacteria


B.

Diatoms

Diatoms are chief producers of the ocean.


184.

The metrics described by whittaker which takes into account the number of species and their eveness is

  • Shannon index

  • Beta diversity

  • Species richness

  • Simpson index


A.

Shannon index

Whittaker described three common metrices to measure species level biodiversity, encompassing attention to species richness or evenness. They includes:

(i) Species richness - Number of given species in given area.

(ii) Simpson index - Number of species present as well as there relative abundance.

(iii) Shannon index - Number of species and their evenness.


185.

Slime layer and capsule in bacteria are modifications of the

  • Glycocalyx

  • Cell wall

  • Plasma membrane

  • Pellicle

  • Pellicle


A.

Glycocalyx

Glycocalyx is a glycoprotein- polysaccharide covering that surrounds the cell- membranes of some bacteria, epithelia and other cells. Most animal epithelial cells have a fuzz like coat on the external surface of their plasma membranes.


186.

Ciliates differ from all other protozoans in

  • using flagella for locomotion

  • having a contractile vacuole for removing excess water

  • having two types of nuclei

  • using pseudopodia for capturing prey


C.

having two types of nuclei

Ciliates differ from other protozoans in having two types of nuclei.

For example, Paramoecium has two types of nuclei i.e. macronucleus & micronucleus.


187.

Consider the following statements with respect to fungi

(a) They show a great diversity in morphology and habitat

(b) The white spots seen on mustard leaves are due to a saprophytic fungus

(c) They prefer to grow in cold and humid places

(d) The cell walls of fungi are composed of chitin and polysaccharides

Of the above statements-

  • (a) and (b) are correct

  • (a) and (d) are correct

  • (a) and (c) are correct

  • (b) and (d) are correct

  • (b) and (d) are correct


B.

(a) and (d) are correct

Among all the four statements, statement a and d are correct. Others can be corrected as-

(b) The white spots seen on mustard leaves are due to parasitic fungus.

(c) They prefer to grow in warm and humid places.


188.

Which of the following are found in extreme saline
conditions?

  • Archaebacteria

  • Eubacteria

  • Cyanobacteria

  • Mycobacteria


A.

Archaebacteria

9353 Views