NEET Botany MCQs

In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are:

• Synergids, antipodals and Polar nuclei
• Synergids, Primary endosperm nucleus and zygote
• Antipodals, synergids, and primary endosperm nucleus
• Synergids, Zygote and Primary endosperm nucleus

What is the function of tassels in the corn cob?

• To protect seeds
• To attract insects
• To trap pollen grains
• To disperse pollen grains

The phenomenon of pleiotropism refers to:

• more than two genes affecting a single character.
• presence of several alleles of a single gene controlling a single crossover
• presence of two alleles, each of the two genes controlling a single trait
• a single gene affecting multiple phenotypic expression.

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by:

• Henking
• Thomas Hunt Morgan
• Sutton and Boveri
• Alfred Sturtevant

What is the role of RNA polymerase III in the process of transcription in Eukaryotes?

• Transcription of only snRNAS
• Transcription of rRNAs (28S, 18S and 5.8S)
• Transcription of tRNA, 5 srRNA and snRNA
• Transcription of precursor of mRNA

Expressed Sequence Tags (ESTs) refers to:

• Certain important expressed genes.
• All genes that are expressed as RNA.
• All genes that are expressed as proteins
• All genes whether expressed or unexpressed.

Unequivocal proof that DNA is the genetic material was first proposed by:

• Wilkins and Franklin
• Fedrick, Griffith
• Alfred Hershey and Martha Chase
• Avery, Macleoid and McCarthy

Upon exposure to UV radiation, DNA stained with ethidium bromide will show:

• Bright orange colour
• Bright red colour
• Bright blue colour
• Bright yellow colour

In gene gun method used to introduce alien DNA into host cells, microparticles of ______ metal are used.

• Silver
• Copper
• Zinc
• Tungsten or gold

During the purification process for recombinant DNA technology, addition of chilled ethanol precipitates out:

• Polysaccharides
• RNA
• DNA
• Histones