Which of the following statements about Pteridophytes is true?

• The homosporous forms are precursors to the seed habit

• Gametophyte is the dominant plant body

• First terrestrial plants to possess vascular tissues

• Equisetum is a member of pteropsida

• Equisetum is a member of pteropsida

Pinus seed cannot germinate and establish without fungal association. This is because :

• it has obligate association with mycorrhizae.

• it has very hard seed coat

• its seeds contain inhibitors that prevent germination.

• its embryo is immature

243.

Phloem in gymnosperms lacks :

• Sieve tubes only

• Companion cells only

• Both sieve tubes and companion cells

• Albuminous cells and sieve cells

The alga used for quick sewage disposal is 

• Ulothrix

• Cladophora

• Volvox

• Chiarella