Question

Correctly matched set of phylum, class, and example is
(a) Mollusca- Bivalvia-Pinctada
(b) Protozoa-Mastigophora- Entamoeba
(c) Chordata- Cyclostomata- Phrynosoma
(a) Arthropoda-Diplopoda-Scolopendra

Answer 1

Hint: The correctly matched set belongs to the phylum that is commonly referred to as soft-bodied animals who are mostly marine. The example in the set is an important animal being harbored in aquaculture for their secreted products.

Complete answer:
The phylum Mollusca includes soft-bodied animals who are mostly marine. Their body is unsegmented and divisible morphologically into a distinct head, muscular foot, and visceral hump. They are divided into six classes including Pelecypoda. In this class, the animals have a laterally compressed body. Their shells are made up of two halves with an unhinged anterior portion. Thus, they are also known as Bivalvia. Pinctada or the pearl oyster, found in saltwater and harvested for beautiful pearls.

Additional Information:
 -Protozoan protists are classified into four groups based on the type of locomotion exhibited by its members which includes Mastigophora and Sarcodina.
-Mastigophora possesses flagella as their locomotory apparatus. They can be free-living aquatics, parasites, commensals, or symbionts. E.g. Trypanosoma, Leishmania. They are also known as zooflagellates.
-Sarcodina or Rhizopoda is a group for members that develop pseudopodia or temporary cytoplasmic extensions for locomotion. Entamoeba histolytica.
-Cyclostomata is an aquatic vertebrate included in the section of Agnatha or Jawless vertebrates. Their mouth does not possess jaw and notochord persists throughout their life. They are cold-blooded with the absence of paired appendages and thus bear a single nostril.
Phrynosoma or horned toad is a spiny lizard found in the USA and Mexico. Due to the presence of desert-like adaptations, this reptile is commonly known as the desert lizard.
-Diplopoda is a class of Phylum Arthropoda famous for millipedes or Julus. Their body is divided into head, thorax, and abdomen with a single pair of antennae. Apart from the first thoracic segment, the rest possess a pair of legs while the abdominal segments possess two pairs of legs.
-Scolopendra belongs to the class Chilopoda of Arthropods. The body is divisible into the head and trunk. A pair of legs are present on each trunk segment. Modification of the first pair of legs into poison claws can be observed. It is also commonly known as a centipede
So the correct option is ‘A’.

Note: -Entamoeba histolytica is a pathogenic protist residing in the upper part of the human large intestine and causing amoebic dysentery.
-Leishmania causes kala-azar or black sickness. The disease is quite common in parts of Africa and India. It is transmitted through a bite of the sandfly.