Chapter 3

Assertion: Gymnosperms are heterosporous. Reason: They produce haploid microspores and megaspores.

Assertion: PEN is triploid in angiosperm. Reason: PEN is formed by fusion of haploid male gamete with the dipoid secondary nucleus.

Assertion: The cells of highly reduced female gametophyte (embryo sac in angiosperm) is haploid. Reason: The embryosac is formed by meiosis.

Assertion: Cyanobacteria included in kingdom Plantae. Reason: Cyanobacteria belong to algae.

Assertion: Algae are autotrophic. Reason: Algae contain chlorophyll pigments.

Assertion: Pyrenoids are storage bodies. Reason: Pyrenoids contains starch and proteins.

Assertion: Rhodophytes of shallow water body do not appear reddish. Reason: Rhodophytes of shallow water body have lesser synthesis of phycoerythrin.

Assertion: Phaeophyceae are brown algae. Reason: Phaeophyceae contain large amount of xanthophyll pigment called fucoxanthin which gives brown colour.

Assertion: Chlorella used as a food supplement by space travellers. Reason: Chlorella is unicellular green algae.

Assertion: Sphagnum is used for transhipment of living material like seedlings. Reason: Sphagnum has capacity of water retention.

Assertion: Pteridophytes evolutionarily, are first terrestrial vascular plants. Reason: Pteridophytes are soil binders

Assertion: Development of zygote into young embryo takes places within the female gametophytes in Pteridophytes Reason: This event is a precursor to seed habit, considered an important step in evolution.

Assertion: Algae increases level of dissolved oxygen in their immediate environment. Reason: They show oxygenic photosynthesis

Assertion: Rhodophyceae commonly known as red algae. Reason: Their body predominantly contain red pigment r-prycoerythrin.

Assertion: The spread of living Pteridophytes is restricted to narrow geographical region. Reason: They require cool, damp and shady place to grow and require water for fertilization.

Assertion: Bryophytes are of great ecology importance. Reason: Bryophytes play important role in plant succession on bare rocks.

Assertion: Leaves of gymnosperm can't withstand extremes of temperature. Reason: Leaves of gymnosperm posses' large surface area with thin cuticle.

Assertion: Volvox show diplontic type of life cycle. Reason: They show free living sporophyte.

Assertion: Most algae show haplontic type of life cycle. Reason: They show free living sporophyte

Assertion: Most algae show haplontic type of life cycle. Reason: A Fucus alga shows diplontic type of life cycle.