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Read the characteristics given below of ...

Read the characteristics given below of a chordate:
a) two-chambered heart
b) poikilotherms
c) exclusively marine
e) oviparous with direct development
e) separate sexes
Which of the following possess all of the above features?

A

Labeo

B

Rana

C

Trygon

D

Exocoetus

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the characteristics of the chordate provided and determine which organism possesses all the mentioned features. ### Step-by-Step Solution: 1. **Identify the Characteristics**: - Two-chambered heart - Poikilotherms (cold-blooded) - Exclusively marine - Oviparous with direct development - Separate sexes 2. **Understanding Two-Chambered Heart**: - Chordates like fish typically have a two-chambered heart consisting of one atrium and one ventricle. This is a key feature of many aquatic organisms. 3. **Understanding Poikilotherms**: - Poikilothermic animals cannot regulate their body temperature internally and are dependent on the external environment. Most fish are poikilothermic. 4. **Exclusively Marine**: - The organism must live only in marine environments (oceans and seas) and not in freshwater. 5. **Oviparous with Direct Development**: - Oviparous organisms lay eggs, and direct development means that the young hatch from eggs without going through a larval stage. 6. **Separate Sexes**: - This means the organism has distinct male and female individuals, each producing different gametes. 7. **Evaluate the Options**: - **Option 1: Labio (Labio rohita)**: This is a freshwater fish, so it does not fulfill the marine requirement. - **Option 2: Rana (Rana tigrina)**: This is a frog (an amphibian), which does not have a two-chambered heart and is not exclusively marine. - **Option 3: Trigon (stingrays)**: While they have many of the characteristics, they are not oviparous; they are viviparous. - **Option 4: Exopoitus**: This is a marine fish that has a two-chambered heart, is poikilothermic, is oviparous, and has separate sexes. 8. **Conclusion**: - The organism that possesses all the above features is **Exopoitus**. ### Final Answer: **Exopoitus** possesses all the characteristics mentioned in the question.
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