Cross Pollination (Allogamy, Xenogamy):
Cross Pollination includes the transfer of pollen grains from the flower of one plant to the stigma of the flower of the other plant. It is also termed as Xenogamy. (Gk. Xenos = Strange and gamos = marriage) or allogamy (gk, allos = other and gamos = marriage. The major floral characteristics that facilitate cross pollination are:i) Herkogamy:
Flowers are bisexual however the necessary organs, the stigmas and stamens, are arranged in the flower, in such a manner that self pollination becomes mechanically not possible. Example: Hibiscus sps, Gloriosa superba, and so on.
Hibiscus: The stigmas project far over the stamens.
Gloriosa superba: The style is reflexes away from stamens.ii) Dichogamy:
The Pollen and stigma of flower mature at various times to evade self-pollination. It is of two kinds:
a. Protography:
Gynoecium matures previously than androecium example: Aristolochia and so on.
b. Protandry:
Androecium matures and drop pollen gynoecium example: maize.iii) Self-incompatibility:
In certain plants, whenever the mature pollen fall on the receptive stigma of similar flower, it fails to bring around self pollination. This is termed as self incompatibility. Beneath such circumstances, the cross pollination is the only choice.iv) Male sterility:
The pollen grains of certain plants are not functional. These plants set seeds just after crossing pollination.v) Dioecism:
The Cross pollination always takes place whenever the plants are unisexual and dioecious that is, female and male flowers take place on separate plants. Example: Papaya, certain cucurbits and so on.vi) Heterostyly:
The flowers of certain plants have distinct lengths of stamens and styles therefore that self pollination is impossible example: Linum, Primula, and so on.
Latest technology based Biology Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Pollination homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Pollination, project ideas and tutorials. We provide email based Pollination homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Pollination. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Biology homework help and assignment help services. They use their experience, as they have solved thousands of the Biology assignments, which may help you to solve your complex issues of Pollination. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
thermal expansions tutorial all along with the key concepts of Linear Expansion, Determination of Linear Expansion, Screw Gauge Method, Superficial Thermal Expansion, Cubical Thermal Expansion, Applications of Expansivity, Thermal Expansion in Liquids
tutorsglobe.com hypermetropia assignment help-homework help by online errors of refraction tutors
The key purpose of IAS 10 is to clarify while financial statements should be adjusted for events that occur after the reporting period (or accounting period).
www.tutorsglobe.com offers Object Oriented Analysis homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
tutorsglobe.com laboratory diagnosis assignment help-homework help by online trypanosomes tutors
Oxidation-reduction reactions tutorial all along with the key concepts of Theory, Oxidizing and reducing agents, Balancing redox equations, The oxidation state method
the basic gates are - not gate, and gate, or gate, nand gate, nor gate, xor gate, xnor gate.
tutorsglobe.com fresh water crisis and management assignment help-homework help by online environmental science tutors
a counter is a device that stores (and occasionally displays) the number of times a specific event or process has happened, frequently in relationship to a clock signal.
tutorsglobe.com ramsay-raleighs method assignment help-homework help by online isolation of noble gases tutors
Metallurgy tutorial all along with the key concepts of Types of Furnaces used, Steps involved in Metallurgical Operations, Ore Dressing, Extraction of Crude metal and Purification of Metals
tutorsglobe.com mycorrhiza assignment help-homework help by online biofertilizer tutors
www.tutorsglobe.com offers Components of the SRS homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
Rigid Body Dynamics II tutorial all along with the key concepts of Torque, Angular Momentum, Conservation of Angular Momentum and Its Applications, Top and Gyroscope
tutorsglobe.com farming techniques assignment help-homework help by online poultry tutors
1953077
Questions Asked
3689
Tutors
1458689
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!