Fern spores are usually
Haploid
Diploid
Triploid
Tetraploid
A.
Haploid
In pteridophytes, spore is a haploid structure, which develops after meiosis in the spore mother cell. On germination, it gives rise to a green haploid prothallus (gametophyte) which is monoecious, i.e., has both antheridia (male sex organs) and archegonia (female sex organs).
Which of the following supports a dense population of plankton and littoral vegetation?
Oligotrophic
Eutrophic
Lithotrophic
Agroecotrophic
In which one of the family formations of endosperm doesn’t take place?
Orchidaceae
Cactaceae
Ranunculaceae
Malvaceae
Source of commercial chewing gum latex is
Hevea brasiliensis
Carica papaya
Ficus elastica
Achras sapota
Read the following statements and choose the correct option.
I. Leptosporangiate development of sporangium is found in all membersPteropsida.
II. Seed habit is shown by sellaginella.
III. Gnetum leaves are monomorphic and pinnately compound.
IV. Sporic meiosis is found in Volvolx, Chalmydomonas and Ulothrix.
Choose the correct option.
I and IV
I and II
I, II and IV
All of these