Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms

• the absence of resin duct and leaf venation

• the presence of vessel elements and absence of archegonia

• perianth and two integuments

• perianth and two integuments

Flagellated male gametes are present in all the three of which one of the following sets?

• Anthoceros, Funaria and Spirogyra

• Zygnema, Saprolegnia and Hydrilla

• Fucus, Marsilea and Calotropis

• Fucus, Marsilea and Calotropis

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result

• there is no change in success rate of fertilization

• there is high degree of sterility

• one can conclude that the plant is apomictic

• one can conclude that the plant is apomictic

Spore dissemination in some liverworts is aided by

• elaters

• indusium

• calyptra

• calyptra

35.

Moss peat is used as a packing material for sending flowers and live plants to distant places because

• it is easily available

• it is hygroscopic

• it reduces transpiration

• it reduces transpiration

The thalloid body of a slime mould (Myxomycetes) is known as

• Autosomal

• Cytoplasmic

• Y-linked

• Y-linked

In a moss the sporophyte

• is partially parasitic on the gametophyte

• produces gametes that give rise to the gametophyte

• arises from a spore produced from the gametophyte

• arises from a spore produced from the gametophyte

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

• Hydrilla

• Yucca

• Viola

• Banana

Oxygen is not produced during photosynthesis by

• Green sulphur bacteria

• Nostoc

• Chara

• Cycas

In which of the following forms is iron absorbed by plants?

• Ferric

• Ferrous

• Both ferric and ferrous

• Free element