Free Biodiversity and Variety of Life MCQs with Answers

1041. Which among the following is a diploblastic organism?

• A. Hydra
• B. Crabs
• C. Squid
• D. Earthworm

Explanation: Hydra is a diploblastic organism because it has two germ layers: ectoderm and endoderm. Ectoderm is the outer layer of cells, whereas, endoderm is the inner layer of cells. There is no middle layer, or mesoderm, in diploblastic organisms.

1042. Which of the following is an example of a tetrapod? A. Flesh fly B. Tarantula C. Blue-ringed octopus D. Humming bird

• A. Flesh fly
• B. Trantula
• C. Blue-ringed octopus
• D. Hummingbird

Explanation: A tetrapod is a vertebrate animal that has four limbs. This includes amphibians, reptiles, birds, and mammals. Humming birds, are tetrapods as they have 4 limbs (2 wings and 2 legs). The other options are not tetrapods.

1043. It is a common character between reptiles and amphibians:

• A. Three chambered heart
• B. Externel fertilization
• C. Poikilotherm
• D. Strong pectoral girdle

Explanation: Poikilotherms are organisms that rely on external sources of heat to regulate their body temperature. Both amphibians and reptiles are poikilotherms.

1044. It is a detritus feeder:

• A. Leech
• B. Earthworm
• C. Hook worm
• D. Pin worm

Explanation: Detriyus feeder is an organism that feed off dead or decaying organic matter. Earthworms feed on dead and decaying organic matter, thus making them detriyus feeders. Leeches are parasites and feed on living matter, whereas, pin worms and hook worms are parasite and feed on the blood of the hosts.

1045. Birds are superior to mammals because of:

• A. Mode of locomotion
• B. Mode of nutrition
• C. Mode of reproduction
• D. Mode of voice production

Explanation: Birds are very effecient flyers. They can fly at very high altitudes with very high speeds, for long distances.

1046. One of these animals is prototheria:

• A. Alligator
• B. Spiny ant eater
• C. Penguin
• D. Porcupine

Explanation: Prototheria is a subclass of mammals that lay eggs. The only living members of Prototheria are the platypus and two species of echidna, also known as spiny anteaters.

1047. Which of the following have no individual left?

• A. Cotylosaurs
• B. Whales
• C. Reptiles
• D. Pangolins

Explanation: Cotylosaurs are an extinct group of reptiles that lived during the Carboniferous and Permian periods. They were the ancestors of modern-day reptiles, including snakes, lizards, and crocodiles.

1048. Canal system in sponges develop due to which of the following?

• A. Porous walls
• B. Reproduction
• C. Folding of inner walls
• D. Gastrovascular system

Explanation: The canal system in sponges develops due to folding of inner walls. Sponges are simple animals that do not have a circulatory system. Instead, they rely on a network of canals to transport water throughout their body. The canals are lined with flagellated cells that create currents that help to circulate the water. The water brings food and oxygen to the sponge's cells and carries away waste products.

1049. Which one is non-cellular in most cases in animals?

• A. Chlorenchyma
• B. Mesoderm
• C. Sclerenchyma
• D. Mesenchyme

Explanation: Mesenchyme is a non-cellular layer that is present between the epidermis and the gastrodermis in the body walls of Poriferans. It is a loose connective tissue that is made up of a gel-like matrix and various cellular and fibrous inclusions. In most cases, the mesoglea is noncellular, but it can contain cells in some cases.

1050. Which is not a mammal?

• A. Whale
• B. Walrus
• C. Shark
• D. Seal

Explanation: Sharks are fish, and they do not have the same characteristics as mammals. For example, sharks do not give birth to live young, and they do not have mammary glands.