Some salient features and phyla of organisms are given below. Select the option which shows correct combination of organism, its phylum and salient features.

• Hydra

  coelenterate

  Bilateral symmetry

  Cnidoblasts present

• Planaria

  Platyhelminthes

  Bilateral symmetry

  High Regeneration Capacity

• Ancylostoma

  Annelida

  Bilateral symmetry

  Elongated and Worm shaped

• Octopus

  Mollusca

  Radial symmetry

  External skeleton of shell present

Distinguish between intracellular and extracellular digestion? 

What is the difference between direct and indirect development?

What are the peculiar features that you find in parasitic platyhelminthes?

What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom? 

Water vascular system is the characteristic of which group of the following: 

“All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.

How important is the presence of air bladder in Pisces?

What are the modifications that are observed in birds that help them fly?

Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?

Segmentation in the body is first observed in which of the following