pollen grain造句

The innermost wall of a spore or pollen grain.

A microscopic fossil, as of a pollen grain or unicellular organism.

The probability of any air-borne pollen grain impacting a female strobilus is in any case very small.

It consists of an air-filled protuberance on each side of the pollen grain developed by the separation of the exine layers, giving the pollen a characteristic winged appearance.

In present work, the development of anther, formation of pollen grain and development of ovule and formation of embryo sac in Ramie were observed.

It has been magnified 115 times, but it contains long hairs such as cat fur, twisted synthetic and woollen fibres, a pollen grain, plant and insects.

pollen grains germinate directly on the stigma

Each lobe contains two pollen sacs that produce very large quantities of small pollen grains.

Their sterility showed no pollen grains, anther could not been shed, anther couldn't shed pollen.

2) The incidence of pollen grains abortion is 40.48±2.33%.

Both the pollen grains and the gynoecia are active.

The mean number of pollen grains per stigma is 8—12 Most of the pollen grains are from self pollination. The pollen vigour is strong in the pollinating period.

The results from the pollen densitometers indicate the number of pollen grains sucked into a device per square millimeter of the aperture.

In 1827, upon observing a suspension of pollen grains in water, he discovered BROWNIAN MOTION.