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!
Subphylum Crustacea
Crustacea are mainly aquatic arthropods with gills for respiration. Cephalothorax has usually a carapace; appendages biramous but modified for several functions. Head has a pair of antennules, it pair of mandibles, it pair of antennae, and two pairs of maxillae. Development with a nauplius stage, but this map be not present in higher forms. Crustacea involves arthropods most of that have an aquatic existence. The group abounds in species diversity and biomass.
Figure: A generalised Crustacean
It involves crabs, shrimps, lobsters, crayfish, woodlice etc. even though largely aquatic, there are some semi-terrestrial and terrestrial species. Their success on land is not significant. Let us in brief look into the structural peculiarities of crustaceans. The body of crustaceans is categorized into three regions, head, thorax and abdomen. The head and thoracic segments may be fused to make the cephalothorax. The thorax and abdomen may together form a trunk in some forms. The thoracic segments are covered through a dorsal shield known as carapace. The carapace is a posteriorly directed fold of the body wall of the head and fused along with varying number of segments behind it. Carapace may overhang the sides of the body to some extent or in a few cases it may enclose the whole body.
Predation is a process by which one organism (predator) eats another organism (prey). If the prey population is abundant, the predator population also becomes abundant. If the pred
The Intine Layer As soon as the tetrads release the microspores, the inner layer of the pollen wall (intine) is formed. Proteinaceous lamellae are embedded in the matrix of th
Operative requirements for stage i surgery Although Implant placement under general anesthesia must be done in an operating theatre with complete resources, most implant surger
State two ways in which cardiac muscle is microscopically similar to skeleton muscle.
Access through the crown Advantages : -Allow for better isolation with the rubber dam -Better esthetic anf functioning. -Good coronal seal between visits Limitations : -Proc
Myeloid immunodeficiency causes phagocytic function, which is impaired. Those who are affected with this will undergo with enhance in susceptibility to bacterial infection.
What is the function of the secretions of the prostate, seminal vesicle and bulbourethral glands in reproduction? These secretions with sperm cells from the testicles form the
The cost of replacing these indirect uses of biodiversity, even if it were technically possible, would be so high as to render it impossible to duplicate. We also do not know how
Define Role in protein metabolism and growth? Severe vitamin A deficiency results in abnormal RNA metabolism and protein synthesis and hence interferes with growth. Hence vitam
how does the digestive system of an arthropod operate
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd