Tag: biodiversity and its classifications

Questions Related to biodiversity and its classifications

The feature common to all chordates is

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Presence of gill slits throughout the life

  2. Ventral solid nerve cord

  3. Presence of amnion

  4. Dorsal tubular hollow nerve cord

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Correct Option: D
Explanation:
Chordates are the group of animals which possess a notochord. They have a tubular hollow and dorsal nerve cord. The notochord is the rod like structure. It is made up of cartilage and extends along the length of the body. In certain groups, the notochord forms the tail like structure which helps in swimming in case of fishes. There are presence of pharyngeal slits. There is an endostyle and a post anal tail for at least some period of their life.
Thus, the correct answer is option D. 

Vertebrates are mainly divided into _____ groups

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Four

  2. Three

  3. Five

  4. Two

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Correct Option: C
Explanation:

  • Vertebrates are animals that have a backbone or spinal column, also called vertebrae.
  • The five most well-known classes of vertebrates are mammals, birds, fish, reptiles, amphibians. They belong to the phylum Chordata.
So, the correct answer is 'Five'.

Vertebral column is found in ________________. 

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Arthropoda

  2. Porifera

  3. Both A and B

  4. Vertebrates

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Correct Option: D
Explanation:

The vertebral column, also known as the backbone or spine, is a bony skeletal structure found in vertebrates. It is formed from individual bones called vertebrae, which houses the spinal canal, a cavity that encloses and protects the spinal cord. Therefore, (d) is the correct answer. 

Which of the following is a distinct character of chordates?

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Chorda dorsalis

  2. Cephalization

  3. Claws

  4. Pharyngotomy

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Correct Option: A
Explanation:
Chorda dorsalis is notochord, which is a rod-shaped body found in embryos of all chordates. It is composed of cells derived from the mesoderm and defines the primitive axis of the embryo.
Cephalization is whereby nervous tissue over many generations, becomes concentrated towards one end of an organism, observed throughout evolutionary advancement in phylum Echinodermata.
Claws are curved, pointed appendage, found at the end of a toe or finger in most amniotes like mammals, reptiles and birds.
Therefore, the correct answer is option A.

Vertebral column is derived from which of the following structures?

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Notochord

  2. Dorsal nerve cord

  3. Ventral nerve cord

  4. Outgrowth of cranium

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Correct Option: A
Explanation:

All chordates are characterised by three primary chordate features the presence of a notochord, a dorsal hollow nerve cord and paired pharyngeal gill slits. The notochord, later on, gives rise to a bony vertebral column, which surrounds and protects the spinal cord. So, the correct answer is option B.

Common characteristic of all vertebrates, without exception is

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Presence of exoskeleton

  2. Presence of well developed skull

  3. Two pairs of functional appendages

  4. Division of body into head, neck, trunk and tail

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Correct Option: B
Explanation:

All vertebrates have a living endoskeleton. The characteristic of vertebrates without exception is the presence of a brain. The brain is set inside a bony box called as the cranium. Cranium is made up of eight bones. It protects the human brain from mechanical injury.
Therefore, the correct answer is option B.

The most primitive vertebrates are ______________.

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Ostracoderms

  2. Cephalochordates

  3. Placoderms

  4. Cyclostomes

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Correct Option: A

Part of Herdmania embedded in sand is

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Test

  2. Foot

  3. Tunic

  4. Both A and C

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Correct Option: B

Which is not found in vertebrates?

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Gill opening

  2. Bilateral symmetry

  3. Cnidoblasts

  4. Body scales

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Correct Option: C
Explanation:
A. Gill openings are called gill slits. Gill slits are present in vertebrates.
B. Vertebrates have bilateral symmetry, in which a lengthwise vertical plane divides the body into equal and opposite halves.
C. Cnidoblasts are the cells that contain stinging capsules and are found in Coelenterates.
D. Body scales are the appendages on the surface of the skin and are found in vertebrates.
Hence, Cnidoblasts are not found in vertebrates. So, the correct answer is 'Cnidoblasts'.

Vertebrates do not possess

zoology biodiversity and its classifications vertebrates characteristics of vertebrates classification of organisms

  1. Dorsal heart

  2. Ventral heart

  3. Vertebral column

  4. Coelom

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Correct Option: A
Explanation:

  • The heart of vertebrates is ventrally placed.
  • The body of vertebrates consists of serially arranged vertebrae which comprises of a major part of their axial exoskeleton, the vertebral column or the backbone.
  • The coelom of vertebrates is large and well developed and it is of enterocoelous type.
Hence, vertebrates do not possess dorsal heart. So, the correct answer is 'Dorsal heart'.