Question

In which of the following Sub-phylums excretion is done by protonephredia?
1. Tunicata
2. Vertebrata
3. Cephalochordata
4. None of the above​

Answer 1

Answer-

Your Correct Answer is Option 3.

Explaination-

Actually in those members Protonephredia is present in the form of flame cells which is also known as Solenocytes which help them for the process of excretion.

Example- Branchiostoma or Amphioxus etc.

Extra Information-

• Generally members of this subphylum are found in shallow sea water.

• Those members are unisexual animals.

•Fertilization is external in those animals.

• Instead of paired appendages unpaired fins are present.

• Hepatic portal system in present.

• Respiratory pigment is absent.

• Close type blood vascular system is present.

• Development is indirect only which means the life stages passes through many larval stages.

Answer 2

Answer:

I think Option C is right