Question:

In which of the following animals, does the digestive tract have additional chambers like crop and gizzard?

Updated On: Jul 19, 2024
  • Corvus, Columba, Chameleon
  • Bufo, Balaenoptera, Bangarus
  • Catla, Columbia, Crocodilus
  • Pavo, Psittacula, Corvus
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The Correct Option is D

Solution and Explanation

The correct answer is (d).
Crop and gizzard are part of the digestive tract of birds (class Aves) and insects (phylum Arthropoda). Pavo, Psittacula, Corvus are birds hence all three have crops and gizzard. Chameleon, Bangarus and Crocodilus are reptiles and reptiles do not have crop and gizzard in their digestive system. Bufo belongs to class Amphibia and Balaenoptera is a mammal.
 
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Concepts Used:

Anatomy of Dicotyledonous and Monocotyledonous Plants

Dicot Root:

  • Dicot plants have the taproot system.
  • The outermost layer is called the epidermis. The epidermal cells sometimes project out which appear as the root hairs.
  • The epidermis is followed by the multi-layered cortex, loosely made of the parenchyma cells with intercellular spaces.
  • The inner layer of the cortex is called endodermis, which is tightly packed by the barrel shaped-cells.
  • Endodermis is followed by pericycle, which are a few layers of thick-walled parenchyma cells.
  • In dicots, the central pith is not distinct.
  • There are two to four xylem and phloem.
  • The xylem and phloem are remarked by a layer of parenchymatous cells known as conjunctive tissue.

Monocot Root:

Monocot roots do not show much difference in the anatomy from that of the dicot roots.

  • Monocot plants possess an adventitious root system.
  • As in the dicots, the epidermis forms the outermost layer, followed by cortex, pericycle, endodermis, vascular bundles (xylem and phloem) and pith (random order).
  • Pith is conspicuous and large.
  • The number of xylem in a monocot is six or more.
  • Secondary growth is not seen in the monocot plants.