Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Non-living
- B. Secreted by endodermis
- C. Acellular
- D. Polysaccharide in nature
Explanation: The exoskeleton is secreted by a layer of cells called the epidermis, which is located beneath the existing exoskeleton.
Correct answer: Secreted by endodermis- A. Triploblastic organisation.
- B. Bilateral symmetry
- C. Segmentation
- D. Pseudocoelom
Explanation: Pseudocoelom is not possessed by annelida. It is the major characteristic of phylum nematoda.
Correct answer: Pseudocoelom- A. Spicules
- B. Choanocytes
- C. Gemmules
- D. Both A and B
Explanation: Gemmules are the internal buds in poriferans.
Correct answer: Gemmules- A. Closed circulatory system
- B. Mouth develops from the blastopore
- C. A tubular digestive system with mouth and an anus
- D. The gut is not lined by coelomic epithelium
Explanation: Arthropods and chordates also have tubular digestive system with mouth and an anus.
Correct answer: A tubular digestive system with mouth and an anus- A. A brain, a ventral nerve cord and several ganglia
- B. A brain, a dorsal nerve cord and several ganglia
- C. A brain, a dorsal and ventral nerve cord and several ganglia
- D. A ventral nerve cord and several ganglia
Explanation: A highly deyeloped nervous system is present. It consists of paired ganglia (simple brain) connected to a ventral double nerve cord.
Correct answer: A brain, a ventral nerve cord and several ganglia- A. Euplectella
- B. Spongilla
- C. Leucosolenia
- D. Scolymastra joubini
Explanation: Scolymastra joubini is the sponge of antarctica.
Correct answer: Scolymastra joubini- A. Arachinds
- B. Insects
- C. Crustaceans
- D. All of these
Explanation: The carapace is the hard, protective outer shell or shield that covers the dorsal part of the cephalothorax in crustaceans, including…
Correct answer: Crustaceans- A. Anodonta
- B. Lolgio
- C. Limax
- D. Sepia
Explanation: This class includes bilaterally symmetrical aquatic molluscs. The body is laterally compressed and is enclosed by two pieces of shells…
Correct answer: Anodonta- A. Cake urchin
- B. Brittle star
- C. A and D
- D. Sea urchin
Explanation: Cake urchin belongs to the phylum echinodermate. Cake urchin possess a bilateral symmetry and is flattened, hence giving a globular shape.
Correct answer: A and D- A. Head
- B. Dorsal muscular foot
- C. Dorsal visceral foot
- D. Both A and B
Explanation: Mantle is layer of tissues which is present between the shell and the body to protect and hide the visceral body parts.
Correct answer: Dorsal visceral foot- A. Arthropods
- B. Fishes
- C. Annelids
- D. Nematodes
Explanation: Hydroskeleton or hydrostatic skeleton is a type of internal skeleton in which fluid is kept under constant pressure and that fluid is then…
Correct answer: Annelids- A. Centralized nervous system
- B. Partiallty centralized nervous system
- C. Diffuse nervous system
- D. Partially diffuse nervous system
Explanation: Partially diffused nervous system is that type of primitive nervous sytem which do not have any ganglia present.
Correct answer: Partially diffuse nervous system- A. Vitamin B and C
- B. Vitamin D and K
- C. Vitamin A and D
- D. Vitamin E and C
Explanation: It is a fact that shark liver oil is rich in vitamins like vitamin A and vitamin D and vitamin E.
Correct answer: Vitamin A and D- A. Fishes
- B. Reptiles
- C. Insects
- D. Mammals
Explanation: This is correct because this class INSECTA constitutes about 40% of the total known species.This class represents arond 1 million species…
Correct answer: Insects- A. Gills
- B. Spiracles
- C. Book lungs
- D. Both A and B
Explanation: Aquatic arthropods, such as crustaceans, respire through gills, which are specialized respiratory organs located in their body.
Correct answer: Gills- A. They have a vertebral column
- B. The brain is enclosed by the skull
- C. The embryos have gills
- D. The body develops from three germinal layers
Explanation: Chordates, including vertebrates, undergo embryonic development with three primary germinal layers: ectoderm, mesoderm, and endoderm.
Correct answer: The body develops from three germinal layers- A. Insects
- B. Arachnids
- C. Crustaceans
- D. None of the above
Explanation: Crustacea is a diverse class of arthropods that includes familiar aquatic organisms such as crabs, lobsters, shrimp, and barnacles, as…
Correct answer: Crustaceans- A. Pisces
- B. Ayes
- C. Reptiles
- D. Amphibians
Explanation: Amphibia is a class of vertebrates that includes frogs, toads, newts, and salamanders.
Correct answer: Amphibians- A. To increase the size of the animals
- B. To help in the functioning of reproductive system
- C. To provide space for the development of organs and system
- D. All of these
Explanation: The best function of coelom is described as providing a space for the internal organs, allowing them to move and function independently of…
Correct answer: To provide space for the development of organs and system- A. Ventral nerve cord
- B. Dorsal nerve cord
- C. Lateral nerve cord
- D. All of these
Explanation: Nervous system of nematodes consists of dorsal nerve cord, ventral nerve cord and lateral nerve cord.
Correct answer: All of these