In which of the following animals, does the digestive tract have additional chambers like crop and gizzard?
- Corvus, Columba, Chameleon
- Bufo, Balaenoptera, Bangarus
- Catla, Columbia, Crocodilus
- Pavo, Psittacula, Corvus
The Correct Option is D
Solution and Explanation
The digestive system of birds is structured uniquely to help with the breakdown and absorption of food. Unlike many other animals, birds have additional chambers in their digestive system known as the crop and gizzard. The crop serves as a storage pouch, allowing birds to ingest food rapidly and digest it later. The gizzard, a muscular part of the stomach, grinds down food with the help of ingested stones and grit, facilitating digestion.
Among the provided options:
| Option | Animals |
| 1 | Corvus, Columba, Chameleon |
| 2 | Bufo, Balaenoptera, Bangarus |
| 3 | Catla, Columbia, Crocodilus |
| 4 | Pavo, Psittacula, Corvus |
Option 4, which includes Pavo (peacock), Psittacula (parrot), and Corvus (crow), is comprised entirely of birds. These species have a crop and gizzard as part of their digestive systems. In contrast, the other options include animals such as fish, amphibians, and reptiles, which do not have these additional chambers.
Thus, the correct answer is: Pavo, Psittacula, Corvus.
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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.