Real organs are absent in

  • A
    Mollusca
  • B
    Arthropoda
  • C
    Coelenterata
  • D
    Echinodermata

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Two-chambered heart occurs in

Thallophyta,Bryophyta and Pteridophyta are classified as Cryptogamae,whereas Gymnosperms and Angiosperms are classified as Phanerogamae. Why?

Find out the incorrect sentence.

Explain by giving three reasons,how the work done by earlier scientists with respect to classification is helpful to the present generation.

Match the items of Column $(A)$ with the items of Column $(B)$:
Column $(A)$Column $(B)$
$(a)$ Pore bearing animals$(A)$ Arthropoda
$(b)$ Diploblastic$(B)$ Coelenterata
$(c)$ Metameric segmentation$(C)$ Porifera
$(d)$ Jointed legs$(D)$ Echinodermata
$(e)$ Soft bodied animals$(E)$ Mollusca
$(f)$ Spiny skinned animals$(F)$ Annelida

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