Long Answer TypeExplain why sexual reproduction in angiosperms is said to take place through double fertilization and triple fusion.
How are the male and female gametophytes of pteridophytes and gymnosperms different from each other?
The difference between the male gametophyte of pteridophytes and gymnosperms are:
| Male gametophyte of Pteridophyte | Male gametophyte of gymnosperms |
| Distinct male gametophyte may not be present | Distinct male gametophyte is always present. |
| Antheridium is present | Antheridium is absent |
| Male gametes are flagellated | Male gametes may or may not be flagellated |
| Male gamete needs water as the medium for fertilisation | Male gamete use pollen tube to reach the female gametophyte. |
| Female gametophyte of Pteridophyte | Female gametophyte of Gymnosperm |
| Distinct female gamete may not be present | Distinct female gamete is always present. |
| Largely independent. | Female gamete is attached to the parent plant. |
| Not enclosed in an ovule. | It is enclosed in an ovule. |
Multiple Choice QuestionsA Prothallus is
A structure in pteridophytes formed before the thallus develops
A sporophytic free living structure formed in pteridophytes
A gametophyte free living structure formed in pteridophy
A primitive structure formed after fertilization in pteridophytes
Protonema is
Haploid and is found in mosses
Diploid and is found in liverworts
Diploid and is found in pteridophytes
Haploid and is found in pteridophytes
The giant Redwood tree (Sequoia sempervirens) is a/an
Angiosperm
Free fern
Pteridophyte
Gymnosperm
Which one of the following statements is wrong?
Golden algae are also called desmids
Eubacteria are also called false bacteria
Phycomycetes are also called algal fungi
Phycomycetes are also called algal fungi
Select the correct statement
Salvinia, Gingko and Pinus all are gymnosperm
Sequoia is oneis one ot the talles trees
The leaves of gymnosperm are not well adapted to extremes of climate
The leaves of gymnosperm are not well adapted to extremes of climate
Isogamous condition with non-flagellated gametes is found in
Chlamydomonas
Spirogyra
Volvox
Volvox
Which of the following are likely to be present in deep sea water?
Archaebacteria
Eubacteria
Blue-green algae
Blue-green algae
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