Question

Question 15

15-How many tagmata (body segments) are present in the hexapoda(insecta)?

Group of answer choices

1-6

2-1

3-3

4-2

4-4

Question 16

16-Which of the following organisms has an open circulatory system?

Group of answer choices

1-cephalopods

2-all of these organisms have an open circulatory system

3-birds

4rhinoceros

5-All of these organisms have a closed circulatory system

6-earth worms

Answer 1

Question 15

Solution- Option 3

Three tagmata (body segments) are present in the hexapoda

The three segments of hexapoda are head, thorax, and abdomen.Therefore option 1, 2, 4 and 5 are wrong

Question 16

Solution- Option 5. All of these organisms have a closed circulatory system

Cephalopods, Birds, Rhinoceros and earth worms have closed circulatory system. None of the organisms given in the options have an open circulatory system

Because in Cephalopods, Birds, Rhinoceros and earth worms the blood flows through vessels and blood do not mix with the interstitial fluid

In closed circulatory system, blood flows through vessels and heart pump the blood. Blood do not mix with the interstitial fluid. In open circulatory system, blood is present in hemocoel cavity and there of no mechanism to pump the blood