"Tube in a tube " plan is not exhibited by which one of the following phyla ?

Which one forms the pollen tube

Which one forms the pollen tube

Which one of the following phyla is a pseudocoelomate?

The test tube baby programme employs which one of the following techniques ?

The test - tube baby programme employs which one of the following techniques?

In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube?

In vitro fertilisation is a technique that involves tranfer of which one of the following into the Fallopian tube ?

In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube?

In vitro fertilisation is a technique that involves transfer of which one of the following into the fallopian tube?