Which of the following pairs has open type of circulatory system?

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Q: 75 (SSC/NA)

Which of the following pairs has open type of circulatory system?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,9,24,14,5,9,5

keywords: 

{'circulatory system': [1, 0, 1, 0], 'earthworm': [4, 0, 1, 0], 'silverfish': [3, 0, 0, 2], 'fish': [1, 2, 0, 0], 'tadpole larva': [1, 0, 0, 0], 'open type': [1, 0, 0, 0], 'whale': [1, 0, 1, 0], 'cockroach': [2, 0, 0, 0], 'leech': [1, 0, 0, 0]}

The correct answer for the pair that has an open type of circulatory system is option 3: Cockroach and Silverfish.

An open circulatory system is a type of circulatory system in which the blood is not contained in blood vessels but is instead pumped directly into body cavities, and it bathes the tissues and organs.

Earthworm and leech, mentioned in option 1, have a closed circulatory system. A closed circulatory system is where blood is confined to vessels and circulates within them.

Man and whale, mentioned in option 2, also have a closed circulatory system.

Option 4 states Tadpole larva and fish, but both of them also have a closed circulatory system.

Therefore, the correct answer is option 3: Cockroach and Silverfish. It is important to note that all other options have closed circulatory systems.