Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Hydrophily - Cross-pollination
All hydrophytes are not necessarily pollinated by water. In fact most of the aquatic plant are anemophilous, e.g. Alisma, Nymphaea. Like anemophilous plants floral envelops are highly reduced or absent in hydrophilous plants. Hydrophily may involve underwater pollination referred to as hyphydrophily, e.g., Ceratophyllum, Majus, and Zostera. A unique example of this type is Zostera mariana (a submerged marine perennial) in which pollen grains are long (up to 250pm) and needle-like resembling pollen tubes. Because of the specific gravity of this pollen they freely float at any depth, and when they come in contact with the stigma they coil around it. In some taxa ephydrophily operates. In these plants pollination is brought about at the surface of water.
The classical example is the submerged dioecious plant, Vallisneria. The male and female flowers are produced under water but on maturity the males get detached from the stalk and float on the surface while the female flowers attached to thin, spirally coiled, long, slender stalks are brought to the surface at the time of pollination. Pollination is achieved through water currents when male flowers come in contact with pistillate flowers. After pollination the flowers are dragged down to the bottom by the recoiling of the stalk. The fruits thus develop under water.
Explain Changes in Mental Development of Infants? There is evidently an increase in the brain size. There is a rapid increase in the number of brain cells in the first 5-6 mont
Define Importance of Bioelectrical impedance analysis? Bioelectrical impedance analysis (BIA) is a rapid, non-invasive and relatively inexpensive method for evaluating body com
Which is plant tissues specialized in covering? The dermal tissues or covering tissues of the plants are the epidermis (that covers the leaves and the young stems and shoots) a
What happens when auxin concentration in some structures of the plant is over the action range of the hormone? In some of parts of the plant (roots, stem, lateral buds) there a
Excitation of Heart - Circulation The heart has an inherent capacity to contract rhythmically without any external stimulus. Proof of this is obtained when we see that the hea
Nose Nose consists of external and internal parts. The inner lining of the nose contains millions of small receptors. These receptors are located on the sensory hairs.
Define Tips for elders with chewing difficulty? Elders, without teeth cannot chew their foods, hence they start taking only liquid or semi-solid food. Thus, the quantity of nut
Why is the determination of the blood types of the donor and of the recipient important in transfusions? The Red blood cells have different antigens in the outer surface of the
What is eutrophication? Eutrophication is the process of excessive enhancing of nutrients, like phosphate and nitrate, in water because of direct deposit of non treated sewage.
Explain Bone Healing Process in Nutritional Care? Protein is essential for callus formation, calcification and bone healing especially in cases of orthopaedic surgery. The prot
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd