1:   plica semilunaris in humans is vestigial remenant of.....
Options:
  1. Gill slits
  2. Cecum
  3. Nictitating membrane
  4. Coccyx

Answer: Option 3

Explanation:

The plica semilunaris is a small fold of bulbar conjunctiva on the medial canthus of the eye. It is the vestigial remnant of the nictitating membrane (the "third eyelid") which is drawn across the eye for protection. It is present in other animals such as birds, reptiles, and fish. It is rare in mammals, mainly found in monotremes and marsupials. Discuss this in Forums

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2:   Presence of heterodont dentition is an evidence of....
Options:
  1. Evolving food habits over time
  2. Feeding and hunting specialization in a species
  3. Availability of food and adaptation
  4. All of the above

Answer: Option 4

Explanation:

All of the above. The anatomical term heterodont refers to animals which possess more than a single tooth morphology. For example, members of the Synapsida generally possess incisors, canines ('eyeteeth'), premolars, and molars. The presence of heterodont dentition is an evidence of some degree of feeding/hunting specialization in a species. It also exhibits evolving food habits, availability of food and adaptation towards it. Discuss this in Forums

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3:   Eusthenopteron or lobe-finned fishes have.....scales
Options:
  1. Placoid scales
  2. Cosmoid scales
  3. Elasmoid scales
  4. Leptoid scales

Answer: Option 3

Explanation:

Elasmoid scales are thin, imbricated scales composed of a layer of dense, lamellar bone called isopedine, above which is a layer of tubercles usually composed of bone, as in Eusthenopteron. Discuss this in Forums

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4:   Placoid scales found in........fishes are structurally homologus to vertebrate....
Options:
  1. Lobe-finned........hairs
  2. Cartilaginous.......teeth
  3. Teleosts........nails
  4. None of the above

Answer: Option 2

Explanation:

Placoid scales are found in the cartilaginous fishes: sharks, rays, and chimaeras. They are also called dermal denticles, Placoid scales are structurally homologous with vertebrate teeth. Discuss this in Forums

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5:   What is the characteristic feature of Cephalochordates?
Options:
  1. Presence of a notochord that persists throughout life
  2. Presence of a notochord in the embryonic life
  3. Presence of neurocoel
  4. None of the above

Answer: Option 1

Explanation:

The characteristics of Cephalochordata are that they are marine animals, segmented, and that they possess elongated bodies with a notochord that extends the length of the body and it persists throughout their life. Discuss this in Forums

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6:   Most tunicates are.....
Options:
  1. Cephalochordates which are predators
  2. Chordates which are filter feeders
  3. Cephalochordates which are plankton feeders
  4. None of the above

Answer: Option 2

Explanation:

Tunicates, previously known as Urochordata or urochordates, are members of the Tunicata, a subphylum of the phylum Chordata. They are marine filter feeders. Most tunicates capture suspended particles and plankton by filtering sea water through their siphons via their pharyngeal slits, but some, such as the Megalodicopia hians, are marine sit-and-wait predators. Discuss this in Forums

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7:   Dorsal hollow nervous system consists of....
Options:
  1. Brain, spinal cord and neurocoel
  2. Brain, notochord and nerve cord
  3. Notochord, spinal cord and neurocoel
  4. Notochord, vertebral column and nurocoel

Answer: Option 1

Explanation:

Dorsal, hollow central nervous system - consists of brain & spinal cord & contains a central cavity (called the neurocoel) Discuss this in Forums

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8:   Which of these is a characteristic feature of vertebrates?
Options:
  1. notochord (at least in the embryo)
  2. pharynx with pouches or slits in wall (at least in the embryo)
  3. dorsal, hollow nervous system
  4. All of the above

Answer: Option 4

Explanation:

All of the above. Apart from having notochord, dorsal hollow nervous system and pharynx with pouches or slits in walls (at least in the embryonic life), the characteristic feature of the vertebrates is the vertebrate column. Discuss this in Forums

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The art of being wise is knowing what to overlook.
-William James