In a Grasshopper, How Does Ion Composition of Pre-Urine Compare

question 6

Multiple Choice

In a grasshopper, how does ion composition of pre-urine compare to hemolymph?

• A) Pre-urine is significantly higher in osmolarity (especially with respect to Na+ and K+).
• B) Hemolymph is higher in osmolarity, conserving its Cl−.
• C) Pre-urine is similar to hemolymph in ion composition.
• D) The protein pumps and channels of the Malpighian tubules concentrate Cl− in the pre-urine.

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