Gymnosperms are also called soft wood spermatophytes because they lack

• cambium

• phloem fibres

• thick-walled tracheids

• thick-walled tracheids

Read the following five statements and answer as asked to them
I. In Equisetum the female gametophyte is retained on the parent sporophyte.
II. In Ginkgo male gametophyte is not independent.
III. The sporophyte in Riccia is more developed than that in Polytrichum.
IV.  Sexual reproduction in Volvox is isogamous.
V. The spores of the above statements are correct?

• Two

• Three

• Four

• Four

The second stage of hydrosere is occupied by plants like

• Azolla

• Typha

• Salix

• Salix

Read the following five statements (I to V) and select the option with all correct statements.
I Mosses and lichens are the first organisms to colonise a bare rock. 
II .Selaginella is a homosporous pteridophyte.
III. Coralloid roots in Cycas have VAM.
IV. Main plant body in bryophytes is gametophytic, whereas in pteridophytes it is sporophytic.
V. In gymnosperms, male and female gametophytes are present within sporangia located on sporophyte.

• I, III and IV

• II, III and IV

• I, IV and V

• I, IV and V

A prokaryoticv autotrophic nitrogen-fixing symbiont is found in 

• Cycas

• Cicer

• Pisum

• Pisum

The correct floral formula of chilli is 

The unequivocal proof of DNA as the genetic material came from the studies on a 

I) The sporophyte in liverworts is more elaborate than that in mosses
II) Salvinia is heterosporous
III) The life -cycle in all seed - bearing plants is diplontic
IV) In pinus male and female cones are borne on different trees

• Statements (I) and (III)

• Statement (I) and (IV)

• Statements (II) and (III)

• Statements (II) and (III)

Selaginella and Salvinia are considered to represent a significant step towards evolution of seed habit because

• female  gametophyte is free and gets dispersed like seeds

• female gametophyte lacks archegonia

• megaspores possess endosperm and embryo surrounded by a seed coat

• megaspores possess endosperm and embryo surrounded by a seed coat

The chief water conducting elements of xylem in gymnosperms are 

• vessels

• fibres

• tansfusion tissue

• tansfusion tissue

Male and female gametophytes are independent and free - living in

• mustard

• castor

• Pinus

• Pinus