Free Biodiversity and Variety of Life MCQs with Answers

1001. Radial symmetry is found in which of the following organisms?

• A. Coelenterate and Platyhelminthes
• B. Arthropoda and Mollusca
• C. Porifera and coelenterata
• D. Coelenterata and Echinodermata

Explanation: Radial symmetry is found in Coelenterates and Echinodermata. Radial symmetry is a type of symmetry in which an organism can be divided into identical halves along any plane passing through the center of the organism. This means that the organism has the same shape no matter which way it is turned. Coelenterates are a group of invertebrates that includes jellyfish, sea anemones, and corals. They are radially symmetrical because they are adapted to living in water. The radial symmetry allows them to capture food from all directions. Echinoderms are a group of invertebrates that includes sea stars, sea urchins, and sand dollars. They are radially symmetrical because they are adapted to living on the bottom of the ocean. The radial symmetry allows them to move easily over the uneven surface of the ocean floor.

1002. Which one of the following animals is not a tetrapod?

• A. Snake
• B. Cow
• C. Mantis shrimp
• D. Human

Explanation: Mantis shrimp are not tetrapods. Tetrapods are vertebrates that have four limbs. This includes mammals, birds, reptiles, and amphibians. Mantis shrimp are crustaceans, which means that they are related to crabs and lobsters. They have two pairs of limbs, but they are not used for walking or running.

1003. These animals have three germinal layers but no coelom:

• A. Flat worms
• B. Round worms
• C. snails
• D. Chordates

Explanation: Flatworms and cnidarians are the only animals in the list that have three germinal layers but no coelom. Germinal layers are the three layers of cells that form the embryo of an animal. The three germinal layers are the ectoderm, the mesoderm, and the endoderm. Coelom is a fluid-filled cavity that surrounds the internal organs of an animal.

1004. Which of the following are the first groups of invertebrates which have developed a closed circulatory system?

• A. Nematodes
• B. Annelids
• C. Arthropods
• D. Molluscs

Explanation: The first groups of invertebrates which have developed a closed circulatory system are Annelids.

1005. Which statement is true about gastropods?

• A. Body is bilaterally symmetrical
• B. Both aquatic and land species breathe through lungs
• C. Triploblastic and acoelomates
• D. All of the above

Explanation: Body is bilaterally symmetrical is the only statement that is true about gastropods.

1006. Which combination of class and its description is correct?

• A. Osteichthyes-a bony endoskeleton & gills covered by operculum
• B. Reptilia-lefi aortic arch & internal fertilization
• C. Nematoda-triploblastic & acoelomates
• D. Cephalopods-dorsal nerve cord & bilateral symmetry

Explanation: The correct combination of class and its description is Osteichthyes-a bony endoskeleton & gills covered by operculum.

1007. Garden snail belongs to which class of Mollusca?

• A. Gastropoda
• B. Cephalpoda
• C. Myriapoda
• D. None of these

Explanation: The common examples are: i. Helix aspersa : It is commonly termed garden snail.

1008. The Venus flower basket is also known as which of the following?

• A. Sycon
• B. Leucosolenia
• C. Spongilla
• D. Euplectella

Explanation: Euplectella is called Venus Flower Basket.

1009. S -band locomotion is characteristically seen in which of the following?

• A. Bony fish
• B. Fish like mammals
• C. Cartilaginous fish
• D. All of these

Explanation: The explanation for this question will be added soon!

1010. Which group of animals is not a deuterostome?

• A. Echinodermata
• B. Arthropoda
• C. Mollusca
• D. Both B and C

Explanation: Both option B and C are correct as they are not deuterostomes.