it is a simple multicellular plant
during conjugation, its gametes, which are structurally and physiologically similar, fuses to form a zygote
it possesses spiral chloroplast which enables the plant to photosynthesize
its cells are protected externally by layer of mucilage
there are pyrenoids along the chloroplast
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Please read carefully through this;
Firstly, Spirogyra is a simple multicellular organism that exist as a filament.
Though multicellular organism, it is in the cellular level of organization because its cylindrical cells in the filament are linked end to end by cellular cell wall and protected externally by mucilage.
Secondly, it has an isogametes i.e the gametes are structurally similar ( same size and shape),
but physiologically (functionally) the are not similar because one is male and the other is female. The female gamete is stationary (non-motile) while the male gamete is motile and always moves during conjugation to fuse with the female to form a zygote which grows to form a zygospore.
THE CORRECT OPTION IS " OPTION B" because the gametes are structurally the same but physiologically different.
My contribution, thanks for reading.
B is very correct
look at the option well
The s*xual reproduction in Spirogyra is called conjugation. It involves the fusion of two morphologically identical but physiologically dissimilar non-cilialed gametes. ... The fusion of these gametes takes place by sea lari form conjugation or lateral conjugation.
the gametes in a spirogyra are physiologically dissimilar not similar
One thing u guys need to know about jamb is UNDERSTANDING the question first..what the qustn is pointing at is which of the following is not true about spirogyra.the ans is B. Bcos spirogyra is from the kingdom plantae ie multicellular,phylum thalophyta ie simple multicellular organism. Fact about the ans: all the classes of organism under phylum thalophyta ie volvox,sargassum, algae eithr blue or green and spirogyra type reproduce s*xually by producing male n female gamates which fuse to form a zygote. In the case of spirogyra, the zygote form a thick outer coat around it and becomes a resting zygospore which later form an Adult plant under favorable condition..from the explanation how spirogyra reproduce in the last statement tells the ans.
yes, spirogyra is a multicellular organisms, for those still asking.
now for this question, the correct answer is B.
reference "modern biology page 16, under phylum thallophyta"
Thanks for your contributions. Corrections have been made, the correct answer is B.
The question asks for the statement that is NOT true about Spirogyra.
Let’s check each option:
A. It is a simple multicellular plant → ✅ True
Spirogyra is a filamentous (multicellular) green alga.
B. During conjugation, its gametes, which are structurally and physiologically similar, fuse to form a zygote → ❌ Not true
In Spirogyra, the gametes are structurally similar (isogametes) but physiologically different (one acts as donor, the other as recipient). So they are not both structurally and physiologically similar.
C. It possesses spiral chloroplast → ✅ True
That’s actually why it is called Spirogyra.
D. Cells are protected externally by a layer of mucilage → ✅ True
E. There are pyrenoids along the chloroplast → ✅ True
Pyrenoids are present along the spiral chloroplast.
✅ Correct Answer: B
change the answer. option A is the answer. Spirogyra is neither plant nor animal. it's a protist and it's unicellular
Pls this question has no answer because spirogura is a multicellular green thallophyte plant which belong to the division chlorophyte. (Note nder this thallus plant some are unicellular while others are multicellular e.g chlymadomonas is unicellular while spirogyra is multicellular.) Oooo
if I were to say I would say A, because a spirogyra is not only multicellular but multicellular and filamentous.
MIND U,SPIROGYRA IS A MULTICELLULAR ORGANISM..THE CORRECT ANSWER SHOULD BE "B"
