Algae are useful because they

• are large in number

• are used in alcoholic fermentation

• purify the atmosphere

• are used in curdling of milk.

Gymnosperms are called naked seed plants because these lack :

• cotyledon

• endosperm

• ovary wall

• testa

Pinus seed is originated in :

• capsule

• microsporophyll

• microsporangia

• megasporophyll

Which of the following groups of algae belongs to class Rhodophyceae?

• Laminaria, Fucus, Porphyra, Volvox

• Gelidium, Porphyra, Dictyota, Fucus

• Gracilaria, Gelidium, Porphyra, Polysiphonia

• Volvox, Spirogyra, Ulothrix, Sargassum

• Volvox, Spirogyra, Ulothrix, Sargassum

The plant body of moss (Funaria) is

• completely sporophyte

• predominantly sporophyte with gametophyte

• completely gametophyte

• predominantly gametophyte with sporophyte

Hydrophytes are characterised by :

• thick and large leaf

• delicate and mucilagenous stem

• short spinous stem

• all of the above

Terpentine is obtained from :

• flowers of angiosperm

• wood of gymnosperms

• pteridophytes

• bacteria

The circinate vemation is the characteristic feature of ferns. It refers to :

• coiling of young leaves

• arrangement of leaves on stem

• attachment of sori on leaves

• heterophilly

Which of the following plant yields oil and fibre both ?

• Cocos nucifera

• Eucalyptus

• Brassica campestris

• Euphorbia hirta

The endosperm of Pinus is :

• haploid

• diploid

• triploid

• polyploid