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1251.

Which of the following structures in Pinus are haploidA. Megaspore,integument, rootB. Endosperm,megaspore,pollen grainC. Pollen grain, leaf, rootD. Megaspore,endosperm,embryo

Answer» Correct Answer - b
Because endosperm is haploid (n) and formed before fertilization and megaspore mother cell divides reductionally to form a linear tetrad of haploid megaspores and microspore (= pollengrain) is the first stage of the gametophyte (n).
Discussion
1252.

Fusion of two motile gametes which are dissimilar in size is termed asA. oogamyB. isogamyC. anisogamyD. zoogamy

Answer» Correct Answer - C
Anisogamy is fusion of two motile gametes dissimilar in size. It is observed in some species of chlamydomonas oogamy is also fusion of two dissimilar sized gametes in which female gamete is larger but non-motle . Isogamy is fusion of two similar sized motile gametes.
Discussion
1253.

In Pinus, male cone is made up ofA. MicrosporophyllsB. MegasporophyllsC. AnthersD. Embryo sae

Answer» Correct Answer - A
In Pinus, male cone is made up of microsporophylls.
Discussion
1254.

Chilgoza pinus isA. Pinus girardianaB. Pinus rox burgiC. Pinus wallichianaD. Pinus merkurii

Answer» Correct Answer - A
Discussion
1255.

A plant shows thallus level of organization. It shows rhizoids and is haploid. It needs water to complete its life cycle because the male gametes are motile. Identify the group to which it belongs toA. pteridophytesB. gymnospermsC. monocotsD. bryophytes

Answer» Byrophyta is a groupp of plants which have gametophytic thalloid body. The motile male gamete are produced in special male reproductive structrue called antheridia .
These gametes need thin film of water to move and reach to the female reproductive organ called archegonia. Wrhereas pteriodophytes, gymnosperm and monocots show division of labour and theire body shows higher level of organisation.
Discussion
1256.

The male cone of Pinus is modifiedA. Long shootB. Needle leavesC. Dwarf shootD. None of the above

Answer» Correct Answer - c
Male cones arise in place of dwarl shoots on long shoots and thus are equivalent to dwarf shoots.
Discussion
1257.

Holdfast, stipe and frond constitute the plant body in case ofA. RhodophyceaeB. ChlorophyceaeC. PhaeophyceaeD. All of above

Answer» Correct Answer - C
Discussion
1258.

Holdfast, stipe and frond constitutes the plant body in case ofA. RhodophyceaeB. ChlorophyceaeC. PhaeophyceaeD. All of these

Answer» Phaeophycease In the memebrs of class-phaeophyceae, the plant body is usually attached to the substratum by a hold fast and has a stalk called stipe and a leaf like phtosynthetic organ called frond.
Discussion
1259.

Archegoniophore is present inA. CharaB. AdiantumC. FunariaD. Marchantia

Answer» Correct Answer - D
(d) In Marchantia, a bryophyte, the archegonia (female sex organs) are borne on special branches called archegoniophore or female receptacles. Each archegoniophore has rows of archegonia protected by involucre or perichaetium.
Discussion
1260.

The gametophyte is not an independent, free living generation inA. AdiantumB. MarchantiaC. PinusD. Polytrichum

Answer» Correct Answer - C
(c) In gymnosperms, (e.g. Pinus, Cycas, etc.) the male and female gametophytes do not have and independent free-living existence. They remain within the sporangia retained on the sporophytes.
Discussion
1261.

The gametophyte is not an independent, free-living generation inA. PinusB. PolytrichumC. AdiantumD. Marchantia

Answer» Correct Answer - A
Discussion
1262.

Gametophyte is not an independent free-living generation inA. Liverworts/MarchantiaB. Mosses/PolytrichumC. Ferns/FunariaD. Gymnosperms/Pinus

Answer» Correct Answer - D
Gametophyte is independent free-living generation in Liverworts/Marchantia, Mosses/polytrichum and Ferns/Funaria but dependent in gymnosperms and angiosperms.
Discussion
1263.

Which group of algae are believed to be ancestors of land plants ?

Answer» Correct Answer - Green-algae.
Discussion
1264.

Which alga reproduce sexually by conjugation ?

Answer» Correct Answer - Spirogyra.
Discussion