Free Biodiversity and Variety of Life MCQs with Answers

1401. What is the origin of the acoelomate gut?

• A. Ectodermal
• B. Mesodermal
• C. Endodermal
• D. None of these

Explanation: The endoderm is the innermost primary germ layer, and it is the one responsible for giving rise to the epithelial lining of the digestive tract, respiratory system, and several other internal organs. The gut is derived from the endoderm during embryonic development. In acoelomates (a group of animals without a body cavity called a coelom), the gut lacks a coelom and maintains a solid, simple structure.

1402. Which of the following organism has an eel like body?

• A. Chondrichthyes
• B. Osteichthye
• C. Cyclostomata
• D. Both A and B

Explanation: Cyclostomata have an eel-like body because their shape is long, slender, and cylindrical, resembling that of an eel.This body form helps them move easily through water and mud, allowing smooth, flexible swimming.Their streamlined shape also supports their parasitic or scavenging lifestyle by helping them attach to hosts or navigate narrow spaces.

1403. Water vascular system is present in coelom in which phylum:

• A. Echinodermata
• B. Annelida
• C. Arthropoda
• D. Cnidaria

Explanation: The water vascular system is a hydraulic system unique to the phylum Echinodermata. It facilitates movement, feeding, and respiration in echinoderms, such as starfish and sea urchins. The other phyla listed-Annelida, Arthropoda, and Cnidaria-do not have this system. Annelida have a closed circulatory system, Arthropoda have an open circulatory system, and Cnidaria have a simple body structure without a vascular system.

1404. All of the following are beneficial to human, except:

• A. Honey bee
• B. Silk worm
• C. Locust
• D. Insects for pollination

Explanation: Among the insects listed, locusts are not beneficial to humans. Locusts are notorious for forming large swarms that can devastate crops and vegetation. When they appear in massive numbers, they consume almost all the green plants in their path, causing severe economic losses and threatening food security. Therefore, they are considered harmful rather than beneficial.

1405. A sponge of Antarctica which is more than a meter tall is known as?

• A. Euplectella
• B. Spongilla
• C. Leucosolenia
• D. Scolymastra joubini

Explanation: Anoxycalyx ( scolymastra) joubini is the largest and most conspicuous sponge in the Antarctica and although it has been observed as much as 1 m in height.

1406. Whicjh of the following is a character found in Echinodermata?

• A. Marine habitat
• B. Spiny skin
• C. Water vascular system
• D. All of these

Explanation: Echinoderms are exclusively marine, they have spiny skin and they possess water vascular system for locomotion and transportation. Hence this is the correct option.

1407. Radula is characterstics feature of:

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

Explanation: The explanation for this question will be added soon!Radula is an anatomical structure used by the molluscs for the mechanical food processing. Radula is minutely teethed and has chitinous ribbons.Radula is sometimes compared to tongue.

1408. Eel like body is observed in:

• A. Chondrichthyes
• B. Osteoichthyes
• C. Cyclostomata
• D. Both A and B

Explanation: Cyclostomata belong to the phylum chordates and superficially it has an eel like resemblance.

1409. Which of the following is an example of a tetrapod?A. Flesh fly B. TarantulaC. Blue-ringed octopusD. 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.

1410. Layer absent in diploblastic organism:

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

Explanation: Animals that are diploblastic only have two germ layers: ectoderm and endoderm. The mesoderm is missing in diploblastic animals. Diploblastic animals only have two germ layers: ectoderm and endoderm. The mesoderm, which forms muscles, circulatory systems, and other internal structures, is absent.