Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS

Identify the incorrect statement from the following options:

1. Pollen grains are well preserved as fossils because of sporopollenin.
2. Tapetum possesses dense cytoplasm and generally has multinucleate cells.
3. Parthenium came into India as a contaminant with imported rice and causes pollen allergy.
4. Pollen grains generally measure about 25-50 micrometers in diameter.