Tag: pre fertilization - plants

Siphonogamy is the condition in plants in which pollen tubes are developed for the transfer of the male cells to the eggs. The seed plants are termed as siphonogamous. As a consequence, the spermatophytes are called as siphonogamous by some botanists. Syngamy is the fusion of gametes producing in the formation of a zygote, which develops into a new organism. 

Porogamy is the entrance of the pollen tube in the seed plants through the micropyle. Whereas Chalazogamy is the process of fertilization in which the pollen tube penetrates to the embryo sac.

Therefore, the correct answer is option C.

The entry of the pollen tube into the ovule through the chalaza is known as the chalazogamy. This was discovered by Treub. One such example of xerophyte is Casuarina, which is a plant which can withstand prolonged periods of drought. A flower is a bracteate, bracteolate, sessile, incomplete and unisexual.

Thus, the correct option is D.

Chemotropism is the directional growth movement in response to external chemical stimuli. Movement of pollen tube towards ovule is chemotropic movement. Haptotropism is the growth movement of plant part in response to the touch stimuli. Thigmotropism is the growth movement in response to the touch. Phototropism is the growth movement of plant part in response to the light.

Amoeboid or Invasive is also known as Periplasmodial Tapetum. It is the most common type of tapetum in the angiosperms. This type of tapetum can be seen in Alisma, Butomus, Tradescantia and Typha, etc. The tapetal cells fuse among themselves to make the tapetal periplasmodium. The protoplast of the fused tapetal cells then moves into the locule. This protoplast movement into the locule, may take place during meiotic prophase.

Thus the correct option is B.

After the germination of pollen grains on stigma pollen tube is produced through a germ pore . Pollen tube grows chemotropically through the tissue of stigma and style in response to sugary fluid.

The process fertilization accomplished by means of pollen tube in which the transfer of male gametes to the female gametes takes place.