The spores germinate to give rise to ______, small but multicellular, free-living, mostly photosynthetic thalloid gametophytes called prothallus.
2 of 15
Fusion of male gametes & the egg present in th archegonium result in the formation.
3 of 15
Zygote thereafter produces a Multicellular-well-differentiated ______ . Which is dominant phase of pteridophytes.
4 of 15
In majority of the pteridophytes all spore are similar kinds; such plant are called ______ .
5 of 15
Genera like ______ & ______ which is produced two kinds of spore, macro (large) & micro (small) are known as Heterospore.
6 of 15
The female gametophytes in these plants are retained on the parent ______ for variable periods.
7 of 15
The ______ & ______ Germinate & give rise to female & male gametes, respectively.
8 of 15
The development of zygote into young embryo take place within the ______ . These event is the precursor to seed habit considered an important step in ______ .
9 of 15
The gymnosperm are plants in which the ______ are not enclosed by any ovary wall & remain exposed, both before & fertilisation.
10 of 15
One of the gymnosperm, the giants ______ is one of the tallest tree species.
11 of 15
The gymnosperm are ______ ; they produce haploid microspores& megaspore.
12 of 15
The roots are generally ______ . Roots in some genera have ______ association in the form of ______ ( pinus), while in some other (Cycas) small-specialised roots called coralloid roots are associated with nitrogen-fixing cyanobacteria.
13 of 15
The stem are ______ (cycas) & ______ (pinus, cedrus)
14 of 15
The leaves may be simple or compound. In ______ the pinnate leaves persistent for a few year.
15 of 15
The leaves in gymnosperm are ______ to withstand extremes to temperature, humidity & wind.
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