Which of the following is correct statement
Gametes are diploid
Spores are invariably haploid
Spores and gametes are invariably haploid
Gametes are invariably haploid
Explain the role of tapetum in the formation pollen-grain wall.
Endothecium layer of anther lobes is present
Germination of pollen grain on the stigma is
What is correct for parthenium (Carrot grass)?
$(a)$ It came into India as a contaminant with imported wheat
$(b)$ It causes allergy
$(c)$ Asexual reproduction occurs in its flower
Meiosis can be observed in