Male gametophyte with least number of cell is present in
Pteris
Funaria
Lillium
Lillium
C.
Lillium
Lilium (angiosperm) possesses the male gametophyte with least number of cells. The number of cells in male gametophyte shows the pattern of reduction from bryophytes to angiosperms. In angiosperms, it is reduced to about 2-3 celled and called as pollen grains.
Pollen grains are produced by meiosis of microspore mother cells that are located along the inner edge of the anther sacs (microsporangia).
The number of cells in male gametophyte decreases in the following order.
Funaira > Pteris > Pinus > Lilium
Which one of the following growth regulators is known as stress hormone?
abscsic acid
Ethylene
GA3
GA3
Viruses have
DNA enclosed in a protein coat
prokaryotic nucleus
single chromosome
single chromosome
Select the taxon mentioned that represents both marine and freshwater species
Echinoderms
Ctenophora
Cephalochordata
Cephalochordata
An aggregate fruit is one which develops from
multi carpellary syncarpous gynoecium
Multi carpellary apocarpus gynoecium
complete inflorescence
complete inflorescence
Which one of the following living organisms completely lacks a cell wall?
Cyanobacteria
Sea-fan (Gorgonia)
Saccharomyces
Saccharomyces
An alga which can be employed as food for human being is
Ulothrix
Chlorella
Spirogyra
Spirogyra
A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white - coloured like albinos. Which of the following terms will you use to describe them?
Mutated
Embolised
Etiolated
Etiolated
Anoxygenic photosynthesis is characteristic of
rhodospirlllum
Spirogyra
Chlamydomonas
Chlamydomonas
