Which one of the following is avascular cryptogam?

Which one of the following has haplontic life cycle?

Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms

Solution

The important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms are presence of vessel elements and absence of archegonia.

Which one of the following is heterosporous?

Solution

Salvinia is an aquatic fern with both annual and perennial species. It is heterosporous i.e. with two types of spores,microspores and megaspores.

In gymnosperms, the pollen chamber represents

a cavity in the ovule in which pollen grains are stored after pollination
an opening in the megagametophyte through which the pollen tube approaches the egg
the microsporangium in which pollen grains develop
a cell in the pollen grain in which the sperms are formed

Solution

The fertile region of microsporophyll bears a number of microsporangia or pollen sacs arranged in sori. The pollen chamber represents microsporangium in which pollen grains develop.

Flagellated male gametes are present in all the three of which one of the following sets

Solution

The male gametes of bryophytes are biflagellate, and those of pteriodophytes are multiflagellate,except Selaginella having biflagellategametes. The male gametes of gymnosperms are non motile except those of Cycas having multiciliate gametes

If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?

Solution

It will be types of pigment present in the cell like Rhodophyceae shows presence of phycoerythrin,chlorophyceae shows presence of phycocyanin etc.

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature a different times. As a result

Solution

In the prothallus of a vascular cryptogams the antherozoids and eggs mature at different times which result in failure of self-fertilization

Conifers differ from grasses in the

Solution

Conifers (Gymnosperms) differ from grasses(angiosperms) because in gymnosperms the female gametophyte is actually endosperm which is made before fertilization. While in grasses endosperm is a tissue formed by the fertilization of second male gamete to polar nuclei.Moreover in gymnosperms the endosperm is a haploid tissue while in angiosperms it is triploid.

Peat Moss is used as a packing material for sending flowers and live plants to distant places because

Solution

Peat Moss is used wherever we require to retain water fora long time because peat mosses are hygroscopic in nature and they absorb the moisture from the atmosphere and this moisture keep the living materials and flowers fresh for a long time.

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