Which one of the following shows isogamy with non-flagellated gametes? [2014]a)Sargassumb)Ectocarpusc)Ulothrixd)SpirogyraCorrect answer is option 'D'. Can you explain this answer?

Question

Which one of the following shows isogamy with non-flagellated gametes?       [2014]a)Sargassumb)Ectocarpusc)Ulothrixd)SpirogyraCorrect answer is option 'D'. Can you explain this answer?

Answer

Isogamous flagellated gamets are chlamydomonas
isogamous nonflagellated gametes are spirogyra
anisogamous species are eudorina and some species of chlamydomonas
oogamous species are fucus ( rock weed) chara etc
we should remember that chalmydomonas shows both isogamy and anisogamy

Answer

Isogamy involves the fusion of gametes which are morphologically similar but physiologically distinct. Such gametes are called isogametes and produced in vegetative cells called gametangia. Isogametes may be planogametes (e.g. Ulothrix, Chlamydomonas) or aplanogametes (e.g. Spirogyra).

Some algae (Spirogyra, diatoms etc.) produce non-flagellate gametes called aplanogametes & their fusion process in called aplanogamy or conjugation.

Answer

Spirogyra
refer ncert class 11

Answer

I wd like to suggest you to learn each and every example of ncert carefully

Answer

Option 'D'

Answer

Correct answer is option 'D'

Answer

Answer is D coz Spirogyra, sexual reproduction occurs through conjugation. Gametes are non flagellated morphologically

Answer

Spirogyra is the show that exhibits isogamy with non-flagellated gametes.

Isogamy is a form of sexual reproduction in which gametes are similar in size and shape. In this process, both male and female gametes are motile and have similar characteristics. Non-flagellated gametes refer to gametes that do not possess flagella, which are whip-like structures used for movement.

Here is an explanation of why Spirogyra is the correct answer:

Spirogyra:
- Spirogyra is a filamentous green alga commonly found in freshwater habitats.
- It undergoes a type of sexual reproduction called conjugation, which involves the fusion of two vegetative filaments.
- During conjugation, two filaments come into contact and form conjugation tubes between them.
- The cytoplasmic contents of one filament move through the conjugation tube and fuse with the cytoplasm of the other filament.
- The fusion of cytoplasm is followed by the formation of conjugation tubes that surround the zygote.
- The zygote undergoes meiosis to form haploid cells, which can develop into new filaments.
- In Spirogyra, the gametes produced by the filaments are non-flagellated and are of similar size and shape.
- The fusion of the non-flagellated gametes results in the formation of a zygote.

Other options:
a) Sargassum: Sargassum is a brown alga that exhibits oogamy, not isogamy. Oogamy is a form of sexual reproduction where the female gamete is large and non-motile, while the male gamete is small and motile.
b) Ectocarpus: Ectocarpus is a brown alga that also exhibits oogamy, not isogamy.
c) Ulothrix: Ulothrix is a filamentous green alga that exhibits isogamy with flagellated gametes. The gametes possess flagella, which are used for motility.

Therefore, the correct answer is Spirogyra (option D) as it exhibits isogamy with non-flagellated gametes during its sexual reproduction process.

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