Adaptation of vertebrates
What are the various problems that vertebrates required to resolve to adapt to the terrestrial atmosphere as they came from aquatic habitat? How evolution does solve such problems?
Expert
The major problems vertebrates coming from water required to resolve to adapt to the terrestrial atmosphere were the following: the problem to evade dehydration; the problem of removal of wastes in a medium where water is less obtainable; the trouble of protection against nocent solar radiation; the difficulty of gamete locomotion in the atmosphere for fecundation; the problem of gas exchange, previously done by direct contact of water with gills; the trouble of body support, as it was water that played this function in fishes.
Solutions for the dehydration trouble: impermeable and thicker skin, to lose less water, or moist and permeable skin, similar to in amphibians. Answer for the excretion problem: excretion of urea (as well excreted by chondrichthyes) or uric acid, substances which require less water to be dissolved. Answers for the problem of protection against the radiation: skin pigments which filter injurious radiation, feathers, hair and carapaces. Answer for the gamete movement trouble: internal fecundation (apart from for most amphibians, that contain external fecundation). Answer for the gas exchange trouble: appearing of lungs and airways. Answer for the body support problem: further growth of muscular and bony structures such as claws and limbs.
What do you mean by the term DNA segmenting? Also name the bacterial species employed in the genetic engineering?
Is embryonic development in earthworms indirect or direct? Answer: In earthworms there is no larval phase; therefore the embryonic development is direct.
Write down the best known representatives of the platyhelminth phylum?
Give a brief description of the term plant coleoptile? Why does the removal of coleoptile extremity prohibit plant growth?
Criticism of Taylor's Contribution Scientific Management has contributed a lot to the science of management but it was criticized on the following grounds: 1)
In metagenesis of Obelia and Aurelia what is the form which produces gametes? What is the form which replicates asexually?
Pneumonia: Pneumonia is an inflammation of the lungs caused by infection by Streptococcus pneumoniae. Its major symptoms are: • Cough which produces greenish or yellow sputum. • Very high fever, whi
After crossing the epididymides through which structures do sperm cells pass until exteriorization?
One of my friend has a problem in Work Breakdown Structures (WBS) – Elucidate the value, role and use of the WBS methodology in the project management.
Define the term mitochondria? What is the fundamental morphology of such organelles and in which cells are they be found?
18,76,764
1951723 Asked
3,689
Active Tutors
1431483
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!