Questions in diversity-of-life

Select	Question
	Pinus is
	In Pinus male gametes are produced in the pollen tube by the division of which of the following cells
	Seed of Pinus shows three generations as
	The wing in Pinus seed originates from
	Transfusion tissue, a modified vascular tissue is present in the leaves of
	Most gymnosperms are
	Primary development of male and female gametophytes takes place in the sporangia itself in
	Three generations one within the other are present in the seeds of
	Which one of the following is not a cryptogam
	During adverse season, therophytes survive by