Which are larval stages to porifera?

Which are the larval stages of porifera?

Answer the following State the larval stages of phylum Porifera.

echinoderms are radially symmetrical in larval stage, true or false.

complete the paragraph by choosing the appropriate words given in the brackets : Class Amphibia consist of animals which are strictly ......... only during their larval stages.At that time they breathe through their ..........Tadpoles are such stages which later ......... to form adult frog. Adult frog respires with the help of ................... when in water and with .................. when on land. Thus, it is a true .......... For performing cutaneous respiration, i.e. respiration through skin, they lack .......... in any form. The skin is also kept moist by staying near the water bodies. Amphibians do not have a ......... but eyes are bulging and prominent, this solves the problems of vision.

What are the various stages fo meiotic prophase-I? Enumerate the chromosomal events during each stage?

What is seral stage or seral community?

The animals belong to Porifera bear numerous pores on their body called________.

Write whether the following statements are true or false with proper explanation : Porifera animals have special] type of collar cells

Which are the three cells found in a pollen grain when it is shed at the three celled stage?

Answer the following questions: From which ore is aluminium extracted? What are the stages in its extraction ( give only names )?