Free Biodiversity and Variety of Life MCQs with Answers

• A. Nematoda
• B. Coelenterata
• C. Porifera
• D. Echinodermata

Explanation: Phylum Porifera, which includes sponges, has no tissue level organization.

• A. Blood pressure is high and regular
• B. Amount of blood is limited
• C. Blood circulates through arteries, veins, and capillaries
• D. Blood pressure is low and irregular

Explanation: In an open circulatory system, blood pressure is generally low and irregular, as the blood is not confined to vessels and instead flows…

• A. Mollusca
• B. Annelida
• C. Arthropoda
• D. Echinodennata

Explanation: The most unique characteristics of echinoderms is that a water vascular system is present in their coelom.

• A. Internal, Blind end, rennet cells
• B. External, Tube-like, nephridia
• C. Internal, Saclike, flame cells
• D. External, Saclike, protonephridia

Explanation: Fertilisation is Internal Digestive system is saclike Excretion is performed by flame cells

• A. 3
• B. 8
• C. 5
• D. 11

Explanation: Arthropods are variable structurally. Some are worm-like centipedes while the others are lying insects with the body divided into distinct…

• A. Frog
• B. Crocodiles
• C. Snake
• D. Turtle

Explanation: Crocodiles have a partially divided heart, which means they have a three-chambered heart.

• A. Hirudin
• B. Antihistamine
• C. Heparin
• D. Ptyalin

Explanation: The saliva of leeches contains hirudin, a potent anticoagulant that prevents blood clotting during feeding.

• A. Eutherian
• B. Bird
• C. Prototherian
• D. Metatherian

Explanation: Metatheria is a subclass of mammals that includes marsupials. Unlike placental mammals (eutherians), marsupials give birth to relatively…

• A. Endoderm
• B. Ectoderm
• C. Mesoderm
• D. Mesoglea

Explanation: The systems such as integumentary and nervous develop from ectoderm.

• A. Ostia
• B. Anus
• C. Mouth
• D. Osculum

Explanation: The osculum is a large opening found on the top surface of a sponge (Porifera).

• A. Budding
• B. Spores
• C. Fragmentation
• D. Conidia

Explanation: Asexual reproduction in Porifera (sponges) primarily occurs through a process called budding.Budding is a form of asexual reproduction in…

• A. Acoelomates
• B. Coelomates
• C. Pseudocoelomates
• D. None of them

Explanation: Roundworms are a group of animals belonging to the phylum Nematoda. They are also commonly known as nematodes.

• A. Coelenterate
• B. Annelida
• C. Porifera
• D. Arthropods

Explanation: Free-swimming larvae are produced during the lifetimes of some annelids, particularly in the class Polychaeta.

• A. Molluscs
• B. Annelids
• C. Athropods
• D. Echinoderms

Explanation: A blue-colored respiratory pigment called hemocyanin is found in mollusks.

• A. Lungs
• B. Gills
• C. Skins
• D. Spiracles

Explanation: Aquatic arthropods respire through gills. Gills are specialized respiratory organs that allow these arthropods, such as crustaceans (e.g.…

• A. Sponges
• B. Annelids
• C. Coelontorates
• D. Molluscs

Explanation: A rasping tongue-like radula with horny teeth is present in mollusks, particularly in the classes Gastropoda (snails and slugs) and…

• A. Eumatozoa
• B. Radial
• C. Bilateral
• D. Parazoa

Explanation: Their bodies have distinct right and left halves that are mirror images of each other.

• A. Cotylosaurs
• B. Cyclostomata
• C. Dinosaurs
• D. Amphibians

Explanation: It is universally accepted by biologists that mammals have evolved from reptilian ancestors called Cotylosaurus.

• A. Octopus
• B. Andonta
• C. Squid
• D. Oyster

Explanation: Factual recall. The largest invertebrate animal is the Giant Squid belonging to Class Cephalopoda of Phylum Mollusca.

• A. Placoid
• B. Ganoid
• C. Cycloid
• D. Ctenoid

Explanation: Placoid scales (microscopic) are a characteristic of Chondricthyes also known as Elasmobrachi.