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A segmented worm belonging to the phylum Annelida is known as an earthworm. Terrestrial invertebrates feed on organic matter and are frequently located in damp soil. The earthworm, a farmer’s companion, is an annelid that helps to retain soil fertility.
This is an invertebrate animal that lives mostly in the top layer of the soil. Worm castings are the earthworm’s faeces deposits. And if you delve into these worm castings in your garden soil, you’ll almost surely uncover a few earthworms. Pheretima is the scientific name for the genus of earthworms.
Question
Q.1. Earthworm is placed under which group?
- Hirudinea
- Polychaeta
- Crustacea
- Oligochaeta
Answer: The Correct Answer is Oligochaeta. Earthworm is the common term for the biggest members of the phylum annelida’s oligochaeta.
Q.2. what is the Parasite found in the Seminal Vesicle of Earthworms
- Sarcocystis
- Monocystis
- Nyctotherus
- Nosema
Answer: The Correct Answer is Monocystis. Monocystis is an intracellular parasite that lives in the bundles of growing sperms in its early stage and becomes extracellular in its mature form when it dwells in the contents of earthworm seminal vesicles.
Q.3. In Earthworm the typhlosole is related to
- Excretion
- Respiration
- Absorption
- Reproduction
Answer: The Correct Answer is Absorption. The typhlosole is a dorsal flap of the intestine in earthworms that spans the length of the tube, effectively constructing a tube inside a tube and enhancing the absorption area by the inner surface. Its purpose is to increase the surface area of the intestine in order to improve the absorption of digested nutrients.
Q.4. The presence of What causes the body colour of earthworms to change?
- Blood
- Haemoglobin
- Haemocyanin
- Porphyrin
Answer: The Correct Option is Porphyrin. Due to the obvious presence of porphyrin pigment, earthworms are dark brown in color. It shields their skin from the sun’s damaging UV rays. The earthworm’s round muscles are strewn with porphyrin.
Q.5. Region of Earthworm that is a forest of nephridia is
- Clitellar region
- Pharyngeal region
- Typhlosolar region
- Intestinal region
Answer: The Correct Answer is Clitellar Region. Numerous nephridia are discovered attached inside the lining of the body wall in each segment of the Earthworm’s body, from the seventh to the last. Integumentary nephridia are 200-250 in number in each segment, with the exception of the clitellar region, where the quantity is 2,000-2,500 in each segment.
These nephridia are tiny, lack a nephrostome, and have no openings into the coelom. As a result, this Earthworm zone is a nephridia forest.
Q.6. Basically Chloragogen cells are found in?
- The coelomic fluid of the earthworm
- Blood of earthworm
- The body wall of leucosolenia
- Blood of cockroach
Answer: The Correct answer is the coelomic fluid of the earthworm. The cells, which store glycogen and neutralise poisons and are found in the coelomic fluid of some annelids, are yellowish in colour due to the presence of yellow granules termed chlorosomes.
These cells come from the inner coelomic epithelium and assist in excretory activities, as seen most commonly in earthworms.
Q.7. The animal does not show any metamorphosis of larval Stage
- Musca domestica
- Asteria
- Butterfly
- Pheretima Posthuma
Answer: The Correct Answer is Pheretima Posthuma. In the life cycles of Asterias, Musca domestica, and butterflies, there is a larval stage. In the case of Pheretima, however, there is no larval stage and the development is direct.
Q.8. What is the most effective organ for food digestion in Earthworm is
- Stomach
- Mouth
- Pharynx
- Buccal cavity
Answer: The Correct Answer is Pharynx. The buccal cavity leads into the muscular pharynx through a terminal mouth. The esophagus is a tiny, narrow tube that leads to the muscular gizzard. It aids in the crushing of soil particles and the decomposition of dead leaves.
The stomach is divided into 9 to 14 segments. Earthworms eat decaying leaves and organic debris mixed with soil as nourishment. As a result, the pharynx is the first organ in an earthworm’s digestive system.
Q.9. In Pheretima the typhlosole found in
- Oesophagus
- Stomach
- Gizzard
- Intestine
Answer: The correct Answer is Intestine. On the 26th segment, a pair of short and conical intestinal caeca protrude from the gut. The existence of an internal median fold of the dorsal wall called typhlosole is a distinctive feature of the intestine after the 26th segment, except for the last 23rd – 25th segments. This expands the absorption surface area in the intestine.
Q.10. The Mouth is located in the earthworm on
- Prostomium
- Stomium
- Protostomium
- Peristomium
Answer: The Correct Answer is Peristomium. The mouth is located in the peristomium, the earthworm’s first section. The prostomium is a tiny tongue-like lobe located directly above the mouth. Because earthworms lack eyes, ears, noses, and hands, they rely on the prostomium to see their surroundings. They rely on the prostomium and skin to assist them in navigating the soil.
Q.11. From which class Leech Belongs to
- Oligochaeta
- Polychaeta
- Hirudinea
- Chaetopoda
Answer: The Correct Answer is Hirudinea. The leeches, the most highly specialised of the major annelid families, belong to the class Hirudinea in the phylum Annelida (segmented worms). Leeches are dorsoventrally flattened annelids with suckers on both ends and 34 body segments separated into a number of annuli on the outside.
Q.12. Where are the Excretory units of Annelids located?
- Uriniferous Tubules
- Flame Cells
- Nephrostomes
- Nephiridia
Answer: The Correct Answer is Nephiridia. The excretory organs of annelids are nephridia. The nephron is an excretory organ that takes nitrogenous waste from the bodily cavity and expels it through pores on the outside.
The nephristome, which has a funnel-shaped aperture, is where the bodily fluid enters. The fluid is moved via the funnel into nephridium by Cilia. In the bladder, the nephridium loops and expands. Through the nephridiopore, the bladder drains to the exterior of the body.
