Why do algae and fungi shift to sexual mode of reproduction just before the onset of adverse conditions?


Organisms such as fungi and algae switch to sexual mode of reproduction during adverse conditions because sexual reproduction brings variation into the individuals, some of which might help the individuals to adapt to the changed conditions and survive. This ensures the continuity of species.

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In some plants, the female gamete develops into embryo without fertilization. This phenomenon is known as

  • Parthenocarpy

  • Syngamy

  • Parthenogenesis

  • Autogamy


C.

Parthenogenesis

The phenomenon in which female gamete develops into embryo without getting fused with male gamete (fertilisation) is called parthenogenesis.


Oogamous type of reproduction is seen in

(i) Fucus

(ii) Anabaena

(iii) Nostoc

(iv) Volvox

  • (i) only

  • (i) and (ii) only

  • (i) and (iii) only

  • (iii) only

  • (iii) only


E.

(i) and (iv) only

Fucus and Volvox have oogamous type of sexual reproduction.


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Give an example of an organism that enters 'diapause' and why.


Zooplankton under unfavorable enters ‘diapause’ which is a state of suspended development.

 

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Which of the following statements is incorrect?

  • Claviceps is a source of many alkaloids and LSD.

  • Conidia are produced exogenously and ascospores endogenously

  • Yeasts have filamentous bodies with long thread-like hyphae.

  • Morels and truffles are edible delicacies


C.

Yeasts have filamentous bodies with long thread-like hyphae.

Yeast is an unicellular sac fungus. It lacks filamentous structure or hyphae.


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