Multiple Choice Questions

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Seed which are able to withstand reduction in moisture and temperature are called

  • dormant seeds

  • recalcitrant seeds

  • orthodox seeds

  • non- viable seeds


C.

orthodox seeds

Orthodox seeds are the seeds that survive drying or freezing during ex- situ conservation. These are long- lived seeds and can be successfully dried to moisture contents.

A dormant seed is one that is unable to germinate in a specified period of time under a combination of environmental factors that are normally suitable for the germination of the non- dormant seed.

Recalcitrant seeds are seeds that do not survive drying and freezing during ex-situ conservation and vice versa.

Non- viable seeds are the seeds that do not germinate even if all the favourable conditions needed for germination are provided.


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The edible part of apple/ pear is

  • cotyledons

  • thalamus/ receptacle

  • mesocarp

  • endocarp


Plasmid is

  • small extrachromosomal circular self replicating DNA that can carry genes into host organism

  • bacteriophage

  • DNA found in mitochondria

  • DNA incorporated in bacterial chromosome


What is true about a gamo spermous apospory?

  • Formation of embryo from egg of embryo sac proliferated from a nucellar cell

  • Formation of embryo from egg of embryo sac formed directly from megaspore mother cell

  • Formation of embryo directly from nucellus

  • Formation of embryo directly from integument


Enzyme required for transcription is

  • RNAse

  • Endonuclease

  • RNA polymerase

  • DNA polymerase


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Anthesis means

  • growth of pollen tube inside the carpel

  • dehiscence of anthers

  • opening of floral bud

  • emergence of anthers


The process of multiplication of DNA from DNA is known as

  • replication

  • transversion

  • transcription

  • translation


Crossing over in diploid organisms is responsible for

  • dominance of genes

  • linkage between genes

  • recombination of linked genes

  • segregation of alleles


First geneticist, father of genetics was

  • de Vries

  • Mendel

  • Darwin

  • Morgan


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A simple technology has been developed in India for plant breeders and farmers to use two plants as biofertilizers for growing rice. These are

  • Azotobacter and Rhizobium

  • Chlorella and Spirulina

  • Azolla and nitrogen fixing blue-green algae

  • Riccia and Marchantia