The main nitrogenous waste formed in the body of earthworm is/are___________?

A. Ammonia
B. Urea
C. Uric acid
D. Trimethylamine oxide

Which of the following excretory structure is associated with gut of the organism?

A. Protonephridium
B. Metanephridium
C. Malpighian tubules
D. Nephrons

Which of the following nephrons play important role in production of concentrated urine?

A. Crotical
B. Medullary
C. Juxtramedullary
D. None of these

Purine and pyrimidine metabolism results in production of____________?

A. Creatinine
B. Trimethyamine oxide
C. Xanthine
D. None of these

Amount of water required to excrete 1gN of Urea is_________?

A. 1 ml
B. 50 ml
C. 100 ml
D. 150 ml

Each ach nephridium of earthworm opens to the exterior by__________?

A. Nephrostome
B. Nephridiopore
C. Flame cell
D. Anus

Which of the following marine fishes are considered direct descendents of fresh water ancestors?

A. Hagfish
B. Jelly fish
C. Star fish
D. Bony fishes

Which excretory product in produced in plants during autotrophic mode of life?

A. Co2
B. H2o
C. O2
D. Both a and b

Which of the following statement about conifers is correct?

A. Stored excretory products in vacuoles, at a concentration that leads to crystal formation.
B. Accumulate waste in leaves, which fall in autumn.
C. Production of black wood in the center.
D. Excrete some of the waste materials directly into soil, occasionally using them as a chemical weapon against other competing plants.

Fishes, most of the invertebrates and amphibians are examples of ________ animals?

A. Endotherms
B. Ectotherms
C. Heterotherms
D. Homeotherms