Carcinomas: Malignant neoplasms originating from epithelial tissues (ectoderm or endoderm, including cutaneous epidermis, hepatopancreas, or glandular organs).
Papillomas are benign epithelial tumors; Fibromas are benign mesenchymal tumors; Sarcomas are malignant tumors of mesenchymal connective tissue origin.
Correct Option: Option 1 (Carcinomas).
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22
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
In microphagous, iliotrophic, and herbivorous fishes (such as Grey Mullet Mugil cephalus and gizzard shads Dorosoma spp.), the stomach is differentiated into an anterior thin-walled cardiac stomach and a posterior thick-walled, highly muscular gizzard (ventriculus).
This grinding gizzard develops from the pyloric division of the stomach and functions to mechanically crush ingested sand, detritus, and diatom frustules.
Correct Option: Option 2 (Pyloric stomach).
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23
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
Demonstration of the mucoid envelope of fresh spore of Myxozoan is best possible by
Fresh spores of many Myxozoan species (such as Henneguya, Myxidium) are surrounded by an external translucent mucinous/mucoid envelope.
Wet-mount suspension in India Ink provides an outstanding negative staining demonstration: colloidal carbon particles cannot penetrate the gelatinous polysaccharide envelope, leaving the clear halo brilliantly highlighted against a solid dark black background.
Correct Option: Option 2 (India Ink).
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24
ICAR JRF Aquatic Animal Health Management 29 Jun 2024Shift 1
Fixed tissues are dehydrated through ascending grades of alcohol.
Xylene: The standard clearing agent that is fully miscible with both absolute ethanol and molten paraffin wax. It clears and renders dehydrated tissue translucent, paving the way for paraffin infiltration.
Correct Option: Option 1 (Xylene).
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