Question

In general, pollen tube enters the ovule through
A. Micropyle
B. Chalaza
C. Hilum
D. Funicle

Answer 1

Hint: When reaching the ovary, the plant part enters the ovule through aperture then moves to a minimum of one in all the synergids. through filament like equipment. It guides the entry of the natural object.

Complete answer:
Micropyle: An instant gap at intervals the ovule of a vascular plant through which the natural object typically enters. Aperture is that the region wherever integuments open and natural objects unleash the male gametes/ nucleus.
Chalaza: Chalaza is that the tissue wherever the integuments and plant part area unit joined. Nutrients from the plant travel through the plant part at intervals the stalk and outer cover through the chalaza into the plant part.
Hilum: A vicinity of the associated organ wherever structures like blood vessels and nerves enter the body. Hilum (botany), a scar on a seed or reproductive structure created by detachment.
Funicle: The stalk that attaches the ovule to the placenta at intervals the ovary of a spermatophyte. It comprises a component of conducting tissue foremost from the placenta into the chalaza

Hence, the correct answer is option (A).

Note: Pollen Grain eventually reaches the aperture of associate ovule and for this purpose, it's progressing to follow one of the next 3 routes:
1. Porogamy: When the pollen grain enters the ovule through aperture. it's normal in most of the angiosperms.
2. Mesogamy: When the pollen grain enters through the integuments or through funiculus.
3. Chalazogamy: When the pollen grain enters through the chalazal tissues.