Conifers differ from grasses in the
production of seeds from ovules
lack of xylem tracheids
absence of pollen tube
absence of pollen tube
D.
absence of pollen tube
The conifers (gymnosperm) differ from the endosperm before fertilization. In fact, in gymnosperms, the endosperm is formed before the fertilization, thus, it is a haploid tissue while in angiosperms, endosperm is formed after fertilization as a result of triple fusion or double fertilization, thus, it is a triploid tissue.
In both conifers and grasses seeds are produced from ovules.
Xlem tracheids are present in both conifers and grasses.
Pollen tubes are also formed in both conifers and grasses.
In which mode of inheritance do you expect more maternal influence among the off spring?
Autosomal
Cytoplasmic
Y-linked
Y-linked
Which antibiotic inhibits interaction between t-RNA and m-RNA during bacterial protein synthesis?
Erythromycin
Neomycin
Streptomycin
Streptomycin
Amino acid sequence, in protein synthesis is decided by the sequence of
t-RNA
m-RNA
c-DNA
c-DNA
Phenotype of an organism is the result of
mutations and linkages
cytoplasmic effects and nutrition
environmental changes and sexual dimorphism
environmental changes and sexual dimorphism
In maize, hybrid vigour is exploited by
bombarding the protoplast with DNA
crossing of two inbreed parental lines
harvesting seeds from the most productive plants
harvesting seeds from the most productive plants
Photochemical smog pollution does not contain
ozone
nitrogen dioxide
carbon dioxide
carbon dioxide
Long filamentous threads protruding at the end of a young cob of maize are
anthers
styles
ovaries
ovaries
The bacterium (Clostridium botulinum) that causes botulism is
a facultative anaerobe
an obligate anaerobe
a facultative aerobe
a facultative aerobe
How many different kinds of gametes will be produced by a plant having the genotype AABbCC?
Three
Four
Nine
Nine
