Prepare for NEET Biology Structural Organisation In Animals (Earth Worm) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert help to study external morphology, digestive system, and reproduction in earthworms.
NEET Questions / Zoology / Structural Organisation In Animals / Earth Worm
Earthworms possess specialized cells called chloragogen cells. These cells are primarily involved in:
Excretion of nitrogenous wastes
Synthesis and storage of glycogen and fat
Regulation of osmotic balance
Production of digestive enzymes
In earthworms, the arrangement of blood vessels supplying the gut and body wall differs significantly. Which of the following best describes this difference?
The gut receives blood only from the dorsal vessel, while the body wall receives blood only from the ventral vessel.
The gut receives blood only from the ventral vessel, while the body wall receives blood only from the dorsal vessel.
The gut receives blood from both dorsal and ventral vessels, while the body wall receives blood primarily from the ventral vessel.
Both gut and body wall receive blood equally from both dorsal and ventral vessels.
The calciferous glands in the earthworm's esophagus are crucial for:
Producing digestive enzymes for protein breakdown
Storing ingested soil particles for grinding food
Maintaining a neutral pH in the blood by excreting excess calcium
Absorbing nutrients from ingested organic matter
Which specific adaptation in earthworms allows them to thrive in waterlogged soils?
Highly developed lungs for efficient oxygen uptake
Specialized gills for extracting dissolved oxygen from water
Cutaneous respiration and ability to tolerate anaerobic conditions for short periods
Symbiotic relationship with anaerobic bacteria in their gut
The typhlosole in the earthworm's intestine primarily functions to:
Grind ingested food particles
Store undigested food material
Increase the surface area for absorption
Secrete digestive enzymes
Earthworms are described as monoecious but cross-fertilizing. This seemingly contradictory statement is resolved by the fact that:
They reproduce asexually by fragmentation, despite having both male and female reproductive organs.
They undergo self-fertilization, but the resulting offspring are genetically diverse due to meiosis.
Although they have both male and female reproductive organs, they exchange sperm with another earthworm during mating.
They alternate between male and female reproductive roles throughout their lifespan.
Which of the following structures in earthworms is primarily responsible for grinding ingested organic matter?
Pharynx
Gizzard
Crop
Intestine
Earthworms are hermaphrodites. What does this mean?
They reproduce asexually.
They reproduce only once in their lifetime.
They possess both male and female reproductive organs.
They require a partner for reproduction.
What type of circulatory system does an earthworm have?
Open
Closed
Partially open
No circulatory system
