Free Biodiversity and Variety of Life MCQs with Answers

1141. The animals which belong to division Radiata is/are?

• A. Triploblastic
• B. Diploblastic
• C. Radioblast
• D. All of these

Explanation: The Radiata is a superphylum that includes both the echinoderms and the ctenophores. The radiata, in this sense, are diploblastic, meaning they have two primary germ layers: endoderm and ectoderm. Thus, the correct option is B.

1142. Radula is a characteristic feature of:

• A. Myriapods
• B. Molluscs
• C. Echinoderms
• D. Cnidaria

Explanation: b) Molluscs: The correct answer is option (b) "Molluscs." The radula is a characteristic feature of mollusks. It is a specialized feeding organ found in many members of the phylum Mollusca. The radula is a rasping tongue-like structure with rows of tiny teeth, used by mollusks for feeding. It is particularly prominent in snails and slugs, which use it to scrape or rasp off food particles from surfaces.

1143. Which of the following is a viviparous animal?

• A. Goat
• B. Duck
• C. Crocodile
• D. All of these options are correct

Explanation: Option (a) suggests that a goat is a viviparous animal. This statement is correct. Goats are mammals, and like all mammals, they are viviparous. Viviparous animals give birth to live young that have developed inside the mother's body.

1144. Porcupine is a mammal because:

• A. The scales on its body are modified as spines for protection against predators
• B. It lays eggs and has mammary glands
• C. The fur on its body is modified as spines and it is warm-blooded
• D. None of the above options are correct

Explanation: The reason why porcupines are classified as mammals is because they share the defining characteristics of mammals, such as having hair or fur, giving live birth, and being warm-blooded. They also possess mammary glands that produce milk to feed their young.

1145. Mantle in molluscs is present over which of the following regions?

• A. Head
• B. Dorsal muscular foot
• C. Dorsal visceral foot
• D. Both A and B

Explanation: Correct option is C. The mantle in molluscs is the dorsal body wall that hides the visceral body part. The flaps are protruding mantle out of its body. The epidermis of the mantle secretes calcium carbonate and conchiolin in many species of molluscs.

1146. Which of the following is an ovoviviparous animal?

• A. Basking shark
• B. Humans
• C. Blue shark
• D. All of these

Explanation: Blue sharks are ovoviviparous. In ovoviviparity, the eggs develop and hatch inside the mother's body, and the offspring are born live. However, the mother provides little or no nourishment to the developing embryos, as they rely on the egg yolk for sustenance.

1147. Animals like starfish have small groups of neurons in each arm connected to a ring of neurons in the center. This type of nervous system is called _.

• A. Centralized nervous system
• B. Partially centralized nervous system
• C. Diffuse nervous system
• D. Partially diffuse nervous system

Explanation: The diffuse nervous system is the most primitive nervous system. In diffuse systems nerve cells are distributed throughout the organism, usually beneath the outer epidermal layer. Large concentrations of nerve cells-as in the brain-are not found in these systems, though there may be ganglia, or small local concentrations of neurons.

1148. Subkingdom parazoa includes:

• A. Annelida
• B. Cnidaria
• C. Porifera
• D. Protozoa

Explanation: Parazoa is the animal sub-kingdom that includes organisms of the phyla porifera and placozoa. Sponges are the most weel known parazoa. They are aquatic organisms classified under the phylum porifera with about 15,000 species worldwide.

1149. Ascaris Lumbricoides is:

• A. Present in stomach
• B. An intestinal parasite
• C. Present in ureter
• D. Present in blood

Explanation: Ascaris is an intestinal parasite of humans. It is the most common human roundworm infection. The larvae and adult worms live in the small intestine and can cause intestinal disease. Ascariasis is caused by ingesting the worm's eggs. This can happen when hands or fingers that have contaminated dirt on them are put in the mouth, or by eating vegetables or fruits that have not been carefully peeled, washed, or cooked.

1150. Which of the following is not a parasite?

• A. Porifera
• B. Platyhelminths
• C. Annelids
• D. Nematode

Explanation: Annelids, nematodes, and platyhelminths are segmented, round, and flatworms respectively. Additionally, all three types of organisms have a parasitic mode of life for the most part. Porifera, also called sponges, are the simplest living organisms. They are aquatic and not parasitic in nature