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POROGAMY A MESOGAMY C Futher steps in the germination of pollen grain
take place at the surface of the stigma where it reaches by pollination. Pollen
grains on reaching the stigma are held by the sticky stigmatic secretion
containing ...
There are three possibilities for a pollen Lube to enter the ovule : (i) Porogamy :
In most of the plants the pollen tube enters the ovule through the micropyle and
the phenomenon is called porogamy. (ii) Chalazogamy : When the pollen tube ...
The pollen tube may enter the ovule either via the chalaza (chalazogamy) (
Billings 1903) or via the micropyle (porogamy) (Woodroof 1928). In walnut, the
pollen tube may enter the micropyle if the ovule has enlarged sufficiently to place
the ...
Jules Janick, James N. Moore, 1996
4
Concepts of Biology XII
[II]. Entry. of. pollen. tube. into. the. ovule. Pollen tube may enter the ovule by any
one of the following routes: 1. Porogamy. When the pollen tube enters the ovule
through microphyte, it is called porogamy (Fig. 25A).
Prof. Kotpal, Dr. Tyagi, Dr. Bendre, & Dr. Pande
5
Plant Anatomy and Embryology
Micropyle/^ Pollen tube Chalaza Ovule Pollen tube Integument Porogamy
Chalazogamy Fig. 7.1. Mode of pollen tube entry into the ovule. Mesogamy (i)
Porogamy. In majority of plants, the pollen tube enters the ovule through the
micropyle.
S. N. Pandey, Ajanta Chadha, 1996
6
Competition Science Vision
This is known as porogamy. In some cases the pollen tube is found to enter
through the chalaza. This mode of pollen tube entry is called chalozogamy.
Formerly, much phylogenetic importance used to be attached to this character but
, now it ...
Porogamy c. Microgamy d. Dichogamy 96. If pollen tube enters the ovule through
integuments, it is termed: 103. a. Porogamy b. Chalazogamy c. Mesogamy d.
Chasmogamy 97. An ovule showing chlazogamy, pollen tube penetrates embryo
...
Daman Saluja, Saluja, 2006
8
Krishna's Objective Question Bank in Biology
The fertilization in which the male gametes are carried through pollen tube is
known as (1) Chalazogamy (2) Siphonogamy (3) Syngamy (4) Porogamy (CBSE
1994) 76. Double fertilization was discovered by (1) KarlSchnarf (2) P.
Maheshwari ...
N Saxena, S Sharma, S Sharma
9
The Embryology Of Angiosperms, 5E
With respect to porogamy it has been suggested by some workers that the entry
of pollen tube into the ovule and its subsequent growth toward the embryo sac is
regulated by a chemotropic substance secreted by the filiform apparatus into the
...
S P Bhatnagar S S Bhojwani, 2009
10
Cmplt Biology For Medical Ent Exams
The entrance of the pollen tube into an ovule through the funicle or the
integument is called (a) Porogamy (b) Mesogamy (c) Chalazogamy (d)
Pseudogamy 74. After penetrating stigmatic and stylar tissues, the pollen tube
usually grows down ...
