Double fertilisation is exhibited by
Life cycle of Ectocarpus and Fucus respectively are
(1) Haplontic, Diplontic
(2) Diplontic, Haplodiplontic
(3) Haplodiplontic, Diplontic
(4) Haplodiplontic, Haplontic
Conifers are adapted to tolerate extreme environmental conditions because of
(1) broad hardy leaves
(2) superficial stomata
(3) thick cuticle
(4) the presence of vessels
Which one of the following statements is wrong?
(1) Algae increases the level of dissolved oxygen in the immediate environment
(2) Algin is obtained from red algae and ccarrageenan from brown algae
(3) Agar-agar is obtained from Gelidium and Gracilaria
(4) Laminaria and Sargassum are used as food
In bryophytes and pteriodophytes, transport of male gametes requires
Select the correct statement.
(1) Salvinia, Ginkgo and Pinus all are gymnosperms
(2) Sequoia is one of the tallest trees
(3) The leaves of gymnosperms are not well adapted to extremes of climate
(4) Gymnosperms are both homosporous and heterosporous
Chromatophores take part in
Which one of the following shows isogamy with non-flagellated gametes?
Which of the following is responsible for peat formation?