ANIMAL REPRODUCTION AND DEVELOPMENT
SEXUAL REPRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The cells of parent algae have nuclei
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Each offspring contains chloroplasts
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Several offspring may be produced at once
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Genetic material is contributed by two parent cells
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Detailed explanation-1: -Spirogyra species can reproduce both sexually and asexually. Asexual, or vegetative, reproduction occurs by simple fragmentation of the filaments. Sexual reproduction occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes.
Detailed explanation-2: -Asexual reproduction in Spirogyra: Spirogyra is a type of filamentous green algae. It reproduces asexually by the method of fragmentation.
Detailed explanation-3: -So, the correct answer is ‘conjugation’
Detailed explanation-4: -So the correct option is ‘Fragmentation’.
Detailed explanation-5: -Sexual reproduction in spirogyra takes place by the process called conjugation. Male cells become amoeboid and crawl across the tube. Sometimes, both male and female cells crawl across the tube and fusion takes place. These cells meet to form zygote which undergoes meiosis division to form new filament.