Free Biodiversity and Variety of Life MCQs with Answers

2981. Metamerism is found in:

• A. Earth worm
• B. Sponges
• C. Snakes
• D. Grass Hopper

Explanation: Metamerism is the repetition of homologous body segments. This type of development can be seen in the Annelids, which include earthworms, leeches, tubeworms, and their relatives. It is also seen in a more advanced form in the Arthropods, such as crustaceans, insects.Earthworms exhibit metamerism with distinct segments along their body, allowing for efficient movement and specialized functions in each segment. Sponges, snakes, and grasshoppers do not exhibit metamerism, making them incorrect choices for this question.

2982. Nematocyst are found in:

• A. Nematodes
• B. Coelenterates
• C. Annelids
• D. Sponges

Explanation: Nematocysts are specialized structures found in coelenterates, which are multicellular aquatic animals living in colonies. These structures serve the purpose of capturing prey and defense. The other options, nematodes, annelids, and sponges, do not possess nematocysts and have different mechanisms for feeding and defense.

2983. Which of the following is not present in fish?

• A. middle ear
• B. internal ear
• C. gills
• D. fins

Explanation: Middle ear: Fish do not possess a middle ear like mammals. Instead, they have a unique structure called the swim bladder, which is used for buoyancy control and sound detection. The swim bladder is not directly involved in hearing like the middle ear in mammals.In summary, while fish possess internal ears, gills, and fins, they do not have a middle ear as found in mammals.

2984. Which of the following has four-chambered hearts?

• A. Lizard
• B. Turtle
• C. Crocodile
• D. Frog

Explanation: Crocodiles are one of the few reptiles that have a four-chambered heart, similar to that of birds and mammals. Their heart has two atria and two ventricles, which are completely separated by a muscular wall known as the septum.

2985. Which one of the following animals has no alimentary canal?

• A. Ascaris
• B. Pinworm
• C. Planaria
• D. Tapeworm

Explanation: Tapeworms are parasitic flatworms, they do not possess an alimentary canal.

2986. Which of the following animals is sedentary in the adult and active in the larval stage?

• A. Sponge
• B. Leech
• C. Salamander
• D. Grasshopper

Explanation: Sponges are animals that belong to the phylum Porifera. They have a sedentary or sessile lifestyle in their adult stage and are active in their larval stage.

2987. Which of the following is included in protostome?

• A. Amphioxus
• B. Sea horse
• C. Cheatopterus
• D. Sea cucumber

Explanation: Cheatopterus is a genus of trilobite, which is a group of extinct arthropods. Trilobites are examples of protostomes, which represent a major evolutionary branch of bilaterally symmetrical animals.

2988. Book lungs may be found in which of the following

• A. Clam worm
• B. Spider
• C. Silverfish
• D. Leech

Explanation: Book lungs are respiratory organs found in certain arachnids, such as spiders. They are called "book lungs" because their structure resembles a series of pages in a book. These respiratory organs are located in the abdomen of spiders and are used for gas exchange, allowing spiders to breathe oxygen from the surrounding air.

2989. Aestivation is also known as:

• A. Spring sleep
• B. Winter Sleep
• C. Autumn sleep
• D. Summer sleep

Explanation: Aestivation is a term used to describe a state of inactivity or dormancy that certain animals enter during hot or dry periods, typically in the summer season. It is similar to hibernation but occurs in response to high temperatures or drought conditions rather than cold temperatures. During aestivation, animals may reduce their metabolic rate, seek shelter, and conserve energy until more favorable conditions return. Therefore, aestivation is commonly referred to as "summer sleep."

2990. Which of the following is a swimming bird?

• A. Penguin
• B. Ostrich
• C. Hawk
• D. Kiwi

Explanation: Penguins are swimming birds. They are highly adapted to aquatic life and are known for their ability to swim and drive in the ocean. They have streamlined bodies, webbed feet, and wings modified as flippers, which help them navigate through water.