Tag: grades of body organisation

Questions Related to grades of body organisation

Cleidoic egg is found in

zoology grades of body organisation characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals basis of the classification of animals criteria for animal classification

  1. Birds

  2. Reptiles

  3. Insects

  4. Both A and B

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Correct Option: D
Explanation:

Cleidoic eggs have a protective shell, and are laid out of water. The shell is porous to air, and may be flexible or calcareous (hard). The eggs contain all the food the embryo needs to develop into a hatchling. The significance of the cleidoic egg is that it enables reproduction out of, and often away from, water. It is a characteristic of birds and reptiles. Hence, option D is correct.

The presence of gill slits, in the embryos of all vertebrates support the theory of?

zoology grades of body organisation characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals basis of the classification of animals criteria for animal classification

  1. Metamorphosis

  2. Biogenesis

  3. Organic evolution

  4. Recapitulation

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Correct Option: A
Explanation:
Metamorphosis is a biological processes by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure through cell growth and differentiation. Metamorphosis is iodothyronine-induced and an ancestral feature of all chordates. For e.g. presence of gill slit in the embryos explains the origin of respiratory systems in all vertebrates.
So the correct answer is 'Metamorphosis'.

The evolution of this structure lead to the human lineage.

zoology grades of body organisation characteristics of annelida and arthropoda characteristics of platyhelminthes and aschelminthes basis of classification in animals basis of the classification of animals criteria for animal classification

  1. Bone

  2. Cranium

  3. Jaws

  4. Notochord

  5. Vertebrae

Show answer
Correct Option: D
Explanation:

The notochord is the defining structure forming in all chordate embryos. In humans beings, the notochord is formed in the third week and eventually replaced by the vertebral column.