Formation of male gametes of gymnosperms
Explain the formation of the male gametes of gymnosperms? Explain the relationship between pollen grains and concept of the alternation of generations?
Expert
In the male strobiles (cones) there exist microsporophylls or fertile leaves of strobile which consists of the microsporangia. Inside the microsporagium spore mother cells go through the meiosis and produce the haploid microspores. The microspore wall grows into the winglike projections (in order to facilitate its aerial propagation) and mitosis takes place generating the two cells, the generative cell and the tube cell. The final structure having these elements is the pollen grain. The pollen grain relates to the alternation of the generations as it is the male gametophyte (haploid stage of the life cycle).
Are arteries carry blood from the heart to lungs containing venous or arterial blood? What occurs to the blood whenever it passes via the lungs?
Define the term Generation Y and their characteristics in Generation groups of Employees ?
After crossing the epididymides through which structures do sperm cells pass until exteriorization?
The rash of hurricanes which pelted the Gulf Coast in the year of 2005 resulted in a large decline in gasoline production as several offshore rigs were shut down and several refineries were taken off line whereas waiting out the hurricane. The decrease in supp
Define the term sarcomeres?
Write the name of the DNA duplication procedure? What is the major enzyme which participates in it?
Explain why in inflammatory and infectious conditions can the clinical signs regarding to the lymphatic system may occur?
Describe the characteristics and organs of digestive system of earthworms associated to the kind of diet of such animals?
Define the term epithelial tissues? What is their general function and how is that function related to the characteristics of the tissue?
Name the processes of photochemical phase of the photosynthesis method?
18,76,764
1936793 Asked
3,689
Active Tutors
1434824
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!