Multiple Choice QuestionsPlasmid 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
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.
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
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
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