15273.Comparable to angiosperms, which of the following algae exhibits diplontic life cycle?
Spirogyra
Ectocarpus
Polysiphonia
Fucus
15275.The gametophyte is not an independent, free-living generation in
Pinus
Polytrichum
Adiantum
Marchantia
15276.In which of the following, all listed genera belong to the same class of algae
Porphyra, Ectocarpus, Ulothrix
Volvox, Spirogyra, Chlamydomonas
Chara, Fucus, Polysiphonia
Sargassum, Laminaria, Gracillaria
15277.In a moss the sporophyte
Arises from a spore produced from the gametophyte
produces gametes that given rise to the gametophyte
is partially parasitic on the gametophyte
Manufactures food for itself, as well as for the gametophyte
15278.In gymnosperms, the pollen chamber represents:
A cavity in the ovule in which pollen grains are stored after pollination
A cell in the pollen grain in which the sperms are formed
The microsporangium in which pollen grains develop
An opening in the megagametophyte through which the pollen tube approaches the egg
15279.Mosses and ferns are found in moist and shady places because both :
depend for their nutrition on micro-organisms which can survive only at low temperature
do not need sunlight for photosynthesis
require presence of water for fertilization
cannot compete with sun-loving plants
15280.Spore dissemination in some liverworts is aided by :
Indusium
Elaters
Peristome teeth
Calyptra
15282.Identify the alga known for a biological activity called bioluminescence.
Spirogyra
Noctiluca
Cyclotella
Chlorella