Question

Observe the figures given below and answer the given questions
(a) In which phylum are these animals included?
(b) Which substance forms the outer layer of their exoskeleton?
(c) What are their locomotory organs?​

Answer 1

here is your answer mate ☺️

a) arthropoda phylum

b)The cuticle or exoskeleton is a protective integument over the external surface of insects. It is an extracellular matrix produced by the epidermis and consists mainly of proteins and the polysaccharide chitin (Tajiri, 2017).

c)Locomotory organs are the organs that help living organisms to move or create motion. For example, Flagella, Cilia, Pseudopodia etc. They have no need of the power of locomotion, and accordingly are usually without wings, legs, or other locomotory organs.

Answer 2

a) These animals are included in the phylum Arthropoda.

b)Outer layer of their exoskeleton is made up of chitin.

c)Jointed legs and wings.

• Arthropoda is the largest phylum in the Animal kingdom.
• The exoskeleton is chitanaceous - chitin is a heteropolysaccharide, it is really very hard to protect them from physical injuries.

• It consists of Insects, Arachnids, and Crustaceans.

The first image is of cockroach Periplaneta americana.

• It belongs to class Insecta.
• It respires by Trachea or spiracles.
• Excretion takes place by Malpighian tubules.

The second image represents a scorpion Buthus.

• It belongs to Class Arachnida.
• It consists of Trachea or book lungs for respiration (a characteristic feature of class Arachnida)
• Excretion is through Coxal glands and Malpighian tubules (main).
• Scorpions also have a pointed poisonous sting tail and a pair of pincers for defense.

Locomotory Organs

• Cockroach has three pairs of jointed legs for locomotion and 2 pairs of wings (used by a few)
• The Forewings - Elytra serves as a protective covering for the pair of hindwings used for flying.
• Scorpion has four pairs of legs for locomotion.