Question
Growth at cellular level is the increase in the amount of
✓
Answer
c
Growth, at cellular level, is principally a consequence of increase in the amount of protoplasm. Since, increase in protoplasm is difficult to measure directly, one generally measures some quantity which is more or less proportional to it. Growth is, therefore, measured by a variety of parameters some of which are; increase in fresh weight, dry weight, length, area, volume and cell number
Growth, at cellular level, is principally a consequence of increase in the amount of protoplasm. Since, increase in protoplasm is difficult to measure directly, one generally measures some quantity which is more or less proportional to it. Growth is, therefore, measured by a variety of parameters some of which are; increase in fresh weight, dry weight, length, area, volume and cell number
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(i) Brown algae vary in colour from olive green to various shades of brown depending upon the amount of the chlorophyll pigment and fucoxanthin present in them.
(ii) In phacophyceae food is stored as complex carbohydrates, which may be in the form of laminarin and mannitol
(iii) The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin in brown algae.
(iv) In brown algae, the plant body is usually attached to the substratum by a holdfast, and has a stalk, the stipe and leaf like photosynthetic organ-the stipe.
(v) Asexual reproduction in most brown algae is by biflagellate zoospores that are pear-shaped and have two unequal laterally attached flagella.
(vi) Majority of the green algae are marine with greater concentration found in the warmer areas.
(vii) The food is stored as floridean starch in chlorophyceae.
(viii) The algae having major pigment chlorophyll a and d are phacophyceae
(ix) Polysiphonia and porphyra are the example of red algae.
(x) The main plant body of the bryophyte is haploid.
(xi) The sex organs in bryophyte are multicellular.
(xii) The female sex organ called archegonium is flask-shaped in bryophyte and produces a single egg.
(xiii) Species of sphagnum, a moss, provide peat that have long been used as fuel and as packing material for trans-shipment of living material because of their capacity to hold water.
(xiv) Green algae along with lichens are the first organism to colonize rocks and hence are of great ecological importance.
(xv) Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialised structures called protonema.
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