Q.4RQ - Biology

Question

Why are open circulatory systems advantageous to some animals? 

a. They use less metabolic energy. 

b. They help the animal move faster. 

c. They do not need a heart. 

d. They help large insects develop.

Step-by-Step Solution

Answer

Open circulatory systems are advantageous to some animals because they use less metabolic energy. 

Hence, option a is correct. 

The open circulatory system is used by arthropods and most mollusks. This is one or more reasons why there are no giant insects; Open circulatory systems are less efficient than closed circulatory systems and cannot move oxygen efficiently enough to power large bodies. 

Step 1: Introduction

• The open circulatory system is the circulatory system in which blood mixes with interstitial fluid.
• The blood is pumped through a blood vessel called a hemocoel, and the blood is referred to as hemolymph.

Step 2: Explanation for the correct option

Open circulatory systems are advantageous to some animals because it requires less metabolic energy. 

This system is mainly found in small animals like arthropods.

Therefore, option (a) is correct. 

Step 3: Explanation for the incorrect options

The open circulatory system does not allow any animal to move more quickly. 

It simply aids in the adaptation of the animal's specific metabolic demands. 

As a result, (b) is incorrect.

The heart exists in the open circulatory system to aid in the flow of hemolymph throughout the organism's body. 

As a result, (c) is incorrect.

Because of their low metabolic rate and small size, insects and mollusks have this system. 

These animals lack arteries, which aid in blood pressure regulation. 

As a result, (d) is incorrect.