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.
tutorsglobe.com uses of radioactive isotopes assignment help-homework help by online nuclear chemistry tutors
theory of elasticity and key concepts of elasticity of demand, income elasticity, cross section, own-price elasticity, cross-price elasticity, dependent variable, arc approach, advertising elasticity, independent variable, point approaches, short run, multiple regressions, elastic, long run, time series and inelastic
tutorsglobe.com atherosclerosis assignment help-homework help by online lipid metabolism tutors
theory and lecture notes of turing machines and algorithm all along with the key concepts of turing machines, algorithm, hilbert’s formulation, simple operation of turing machines. tutorsglobe offers homework help, assignment help and tutor’s assistance on turing machines and algorithm.
While concerning a piece of accounting information, given the four major qualities that are identified is available and it is material it should be gathered and made presented to users.
tutorsglobe.com re-absorption in proximal convoluted tubule assignment help-homework help by online excretion tutors
tutorsglobe.com isolation of noble gases assignment help-homework help by online noble gases tutors
www.tutorsglobe.com offers Design Methods homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
for representation of the main winding diagram, draw solid vertical lines of equivalent length at equivalent distance equal to number of coils. these solid lines point out the top layer coil sides.
tutorsglobe.com law of dominance assignment help-homework help by online laws of mendel tutors
tutorsglobe.com dark reactions assignment help-homework help by online cyclic and noncyclic photophosphorylation tutors
tutorsglobe.com says law of market assignment help-homework help by online simple theory of income determination tutors
the company whose shares have been attained do not become a subsidiary of the investing company. One technique would just include the investment of shares in the company at cost in the investing statement of financial position of company.
tutorsglobe.com functioning of female reproductive system assignment help-homework help by online reproduction tutors
www.tutorsglobe.com offers preparation of ethers homework help, assignment help, online tutoring assistance, organic chemistry solutions by online qualified tutor's help.
1940687
Questions Asked
3689
Tutors
1459916
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!