To avoid toxicity in the egg, bird and reptile waste is in the form of what? ure
ID: 262933 • Letter: T
Question
To avoid toxicity in the egg, bird and reptile waste is in the form of what?
urea
uric acid
ammonia
nitric acid
2
Which of the following is not a necessary characteristic for members of phylum Chordata at some point during their development?
notochord
tail
vertebral column
pharyngeal pouches or gill slits
3
Lampreys live most of their lives as what?
salt water parasite of fish
fresh water parasite of fish
salt water filter feeder
fresh water filter feeder
4
What is the function of the radula?
feeding
reproduction
locomotion
water regulation
5
What is the function of the spiral valve in sharks?
salt regulation
aids respiration
aids digestion
produces teeth
A.urea
B.uric acid
C.ammonia
D.nitric acid
Explanation / Answer
1) B
birds and insects excrete uric acid, whereas mammals and most amphibians excrete mainly urea. whereas uric acid requires less water compared to urea.
2) C
dorsal nerve cord, notochord, gill slits, post-anal tail are 4-characteristics of organisms in Phylum Chordata.
Notochord - a stiff, yet flexible rod located between the nerve chord and the digestive tract.
Post-anal tail - A tail that extends beyond the opening to the anus.
3) A
They live in coastal and fresh waters. At the stage of larvae, they are toothless and feed on microorganisms. After several years, they transform into adults and typically move into the sea to begin a parasitic life, attaching to a fish by their mouths and feeding on the blood and tissues of the host. To reproduce, lampreys return to freshwater, build a nest, then spawn (lay their eggs) and die.
4) A
Mollusca (snails, slugs, squid, octopus, clams, oysters, chiton) - Soft body protected by a hard shell of calcium carbonate, foot movement, visceral mass (internal organs); mantle (secretes shell); radula (rasp-like scrapping organ)
The radula is a special feature of molluscs. It is a cuticular structure of the ectodermal foregut epithelium and is part of the buccal mass, the molluscs feeding apparatus.
5) C
A spiral valve or scroll valve is the corkscrew-shaped lower portion of the intestine of some sharks, Acipenseriformes (sturgeon and paddlefish), rays, skates, bichirs, and lungfishes. A modification of the ileum, the spiral valve is internally twisted or coiled to increase the surface area of the intestine, to increase nutrient absorption.
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