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NEET Biology Solved Question Paper 2015

Multiple Choice Questions

81.

Beta ( $β$ ) diversity refers to diversity

within a community
between communities
between two eco zones
within a population

82.

Which one of the following antibiotics kills bacterial cells by inhibiting the polymerisation of peptidoglycan?

Aminoglycosides
Fluoroquinolones
Quinines
Penicillins

83.

Indicate the correct sequence during spermatogenesis.

Spermatozoa $\to$ spermatogonia $\to$ spermatid $\to$ spermatocyte
Spermatogonia $\to$ spermatocyte $\to$ spermatid $\to$ spermatozoa
Spermatid $\to$ spermatocyte $\to$ spermatozoa $\to$ spermatogonia
Spermatocyte $\to$ spermatozoa $\to$ spermatid $\to$ spermatogonia

84.

Egg in female gametophyte is accompanied by

antipodal cells
synergids
definitive nucleus
tube nucleus

85.

Malacophily is the pollination by

insects
birds
snails
mammals

86.
Which one of the following organisms is not used as a biocontrol agent?

Bacillus sphaericus

Trichoderma viride

Bacillus thuringiensis

Bacillus subtilis

Bacillus subtilis

Bacillus subtilis is a Gram-positive bacteria found in soil and the gastrointestinal tract of ruminants and humans. It is not used as a biocontrol agent.

Bacillus sphaericus is used as a biocontrol agent.

Trichoderma species are free- living fungi that are very common in the root ecosystems. They are effective biocontrol agents of several plant pathogens.

Bacillus thuringiensis is used to control butterfly caterpillars. They are available in sachets as dried spores and are mixed with water and sprayed onto vulnerable plants such as brassicas and fruit trees.