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What is nictitating membrane?...

What is nictitating membrane?

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1. A third transparent eyelid called nictitating membrane is seen in frog.
2. This membrane protects the eye when the frog is under water.
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Which of the following statements is incorrect about the frog ? (i) Eyes are bulged out and covered by a nictitating membrane that protects them while in water (ii) On either side of the eyes a membranous tympanum (ear) receives sound signals (iii) The hind limbs end in four digits and they are largerr and muscular then force limbs that end in five digits (iv) Frogs exhibit sexual dimorphism.

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Knowledge Check

  • Seed coat is not thin, membranous in

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