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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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A bird's keratin-lined _______ helps it grind up food.

  1. a. pharynx
  2. b. crop
  3. c. gizzard
  4. d. gastrovascular cavity

Summary Introduction

Introduction: The gizzard are the modified structure found at the hind part of the stomach that helps for grinding the food. This structure is found in birds and some animals. This organ is made up of thick muscular walls and contains stones that are previously swallowed and help in mechanical breakdown of food. The gizzards are keratin-lined to protect the muscles from the mechanical damage.

Explanation

Reason for the correct answer: The bird’s digestion takes place in two compartments. First the food enters in the glandular or true stomach known as proventriculus (secretory part) and then moves to the muscular stomach called the gizzard. The gizzard contains thick muscular walls with previously swallowed stones that help in grinding the food and then pass back to the proventriculus and vice versa.

Option c. is given as “gizzard”. The gizzard is the organ found in the birds and animals that helps in grinding and digesting foods.

Hence, the correct answer is option c.

Reasons for the incorrect answers:

Option a...

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