Which one of the following is resistant to enzyme action?
Pollen exine
Leaf cuticle
Cork
Wood fibre
Which of the following statements about sporopollenin is false?
Meiosis can be observed in
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
Ubisch bodies are present in
The germpores on the pollen grains are found on the