The green alga rich in proteins used as food supplements even by space travelers is

(1) Chlorella

(2) Scendesmus

(3) Porphyra

(4) Carrageen 

Roots of higher plants show symbiosis with mycorrhiizas for obtaining

(1) sulphates

(2) nitrogen

(3) phosphates

(4) All of these

The world's tallest (angiosperm) flowering tree is

(1) Sequoia

(2) Eucalyptus

(3) Pinus

(4) Cedrus

The wood of Pinus is

(1) manoxylic

(2) polyxylic

(3) pycnoxylic

(4) manoxylic and pycnoxylic

Porous wood has abundance of

(1) vessels

(2) fibres only

(3) tracheids

(4) sieve tubes

Algae are useful because they

(1) are large in number

(2) are used in alcoholic fermentation

(3) purify the atmosphere

(4) are used in curdling of milk

The plant body of moss (funaria) is

(1) completely sporophyte

(2) predominatly sporophyte with gametophyte

(3) completely gametophyte

(4) predominantly gametophyte with sporophyte

Megasporophyll of Cycas has the same nature as

(1) stamen

(2) petal

(3) sepal

(4) carpel

In Ulothrix meiosis takes place in

(1) cells of the filament

(2) holdfast

(3) zygote

(4) zoospores

Mossess and ferns are found in moist and shady places because both

(1) require presence of water for fertilization

(2) do not need sunlight for photosynthesis

(3) depend for their nutrition on microorganisms which can survive only at low temperature

(4) cannot compete with sun-loving plants