In a type of apomixis known as adventive embryony, embryos develop directly from the

  • [AIPMT 2005]
  • A

    Nucellus or integuments

  • B

    Synergids or antipodals in a embryo sac

  • C

    Accessary embryo sacs in the ovule

  • D

    Zygote

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Asexual reproduction occurs by bud in

Which of the following is true/correct option about 'terror of Bengal'?

$(I)$ It is the aquatic plant

$(II)$ It is the invasive weeds

$(III)$ It does not drain oxygen from the water which leads to death of fish

$(IV)$ It can propagate vegetatively

Grafting of tissue or organ between individuals of different species is called

Gemmule formation in sponges is helpful in

  • [AIIMS 2001]