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
D.
Achras sapota
The latex of some plants is commercially important such as
(i) Source of commercial rubber is latex of Hevea brasiliensis, Ficus elastica, Cryptostegia. Maniho glaziou
(ii) Source of chewing or chickle gum is latex of Achras sapota
(iii) Source of enzyme papain is latex of Carica papaya
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