24. Answer briefly V

 

a. Pteridophytes are the first land plants first water plants  with vascular tissues.

 

b. The main plant body of the pteridophytes plants is well-differentiated into true roots, stems and leavesundifferentiated into true roots, stems and leaves.

 

c. Pteridophytes  do not exhibit alternation of generationexhibit alternation of generation. During their life cycle, the diploid sporophytic phase alternates with the diploid gametophytic phasehaploid gametophytic phase.

 

d. In pteridophytes, the sporophyte is the recessive phasedominant phase. The sporophytes reproduce through the spores that are produced in the sporangium. The sporangia that bears leaves are known as sporophytesporophyll.

 

e. The majority of the  pteridophyte plants are classified as homosporousheterosporous as they produce only one type of spore, i.e., either microspore or megaspore. However, in some plants, both the spores are produced. These type of plants are known as heterosporous homosporous.