First slide

Classification of Animals

Question

Which one of the following statements is incorrect about arthropods?

Moderate

A

Respiratory structures include gills, book-gills, book lungs or tracheal system.
B

Blood circulates through open sinuses.
C

Sensory organs like antennae, eyes (compound and simple).
D

They are all dioecious with internal fertilisation.

Solution

Arthropods are mostly dioecious. There are some monoecious forms too.
Fertilisation is usually internal. They are mostly oviparous. Development may be direct or indirect.

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