Respiration - metabolism of pollen tubes, Biology

Assignment Help:

Respiration - Metabolism of Pollen Tubes

In the unpollinated pistils of Hippeastrum hybridum very high O2, tension exists from stigma down through most of the style. During pollen tube growth a marked drop in O2, tension takes place in the region of style containing the tips bf pollen tube and this drop in tension moves down progressively with the growth of the pollen tubes. However, after the passage of the tube, the original high level is restored, though not completely. It appears that the tube grows aerobically through the stigmatic and stylar tissues and only in the lower most regions of the style and ovary that the tube confronts anaerobic condition.


Related Discussions:- Respiration - metabolism of pollen tubes

How inadequate breast milk cause protein energy malnutrition, How Inadequat...

How Inadequate Breast Milk cause protein energy malnutrition? Though prolonged breastfeeding of children is the rule in US, the amount of breast milk secreted in poor Indian mo

Explain about celiac disease, Q. Explain about Celiac Disease? Gluten-s...

Q. Explain about Celiac Disease? Gluten-sensitive enteropathy or, as it is more commonly called, celiac disease, is an autoimmune inflammatory disease of the small intestine. I

Etiological factor of peptic ulcer, Q. Etiological factor of peptic ulcer? ...

Q. Etiological factor of peptic ulcer? Peptic ulcer results when the neural and hormonal abnormality disrupts the factors that normally maintain mucosal integrity and permit pr

Theory of embryology - theory of epigenesis, THEOR Y OF EPIGENESIS - ...

THEOR Y OF EPIGENESIS - It was propounded by C. F. Wolff and supported by Von Baer. According to it, the egg contains the substances which are required in the formation

Haustorial behavior of embryo sac, Haustorial Behavior of Embryo Sac ...

Haustorial Behavior of Embryo Sac There are instances in which the entire embryo sac may grow beyond the ovular tissue. The central cell may also form multicellular projectio

What proportion of children with down syndrome, What proportion of children...

What proportion of children with Down syndrome do you expect when women with Down syndrome have children with men who have 46 chromosomes justify your answer?

Can you explain mitotic apparatus, Q. What is mitotic apparatus? Mitoti...

Q. What is mitotic apparatus? Mitotic apparatus is the set of aster fibers, radial structures around each centriole pair, plus the spindle fibers, fibers that extend across the

Photosynthesis, Photosynthesis Photosynthesis - the process by which p...

Photosynthesis Photosynthesis - the process by which plants utilise energy from sunlight to convert carbon dioxide and water for the synthesis of sugar. This sugar can then be

Explain the carrying capacity in ecology, Explain the carrying capacity in ...

Explain the carrying capacity in ecology? Carrying Capacity :  We have seen that natural populations do not normally achieve the maximum intrinsic rate of natural increase, o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd