In a type of apomixis known as adventive embryony, embryos develop directly from the
Nucellus or integuments
Synergids or antipodals in a embryo sac
Accessary embryo sacs in the ovule
Zygote
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