Question

state true or false

1. All the arthropods have an outter hard covering called exoskeleton
2. The digestive tract has simple structure in phylum mollusca
3. Arachnida have fused head and thorax​

Answer 1

Answer:

1). All the arthropods have an outer hard covering called exoskeleton.

→ True.

More about arthropoda -

• It is the largest phylum.
• Having joint appendages.
• Triploblastic.
• Bilateral symmetrical.
• Coelomate.
• Open circulatory system.
• Segmented.
• Exoskeleton is made of chitin.

2). The digestive tract has simple structure in phylum mollusca.

→ True.

More about mollusca -

• Second largest phylum.
• Triploblastic.
• Bilateral symmetrical.
• Coelomate.
• Organ level of body organisation.
• Unsegmented.
• Having shells.

3). Arachnida have fused head and thorax.

→ True.

More about arachnida -

• Class of joint legged arthropods.
• Having 8 pairs of legs.
• Don't have any sensory organ i.e antenna. Wings are also absent.
• 2 additional pairs of appendages are also present.