Alimentary Canal Differentiation in Hirudinaria
The differentiation of the digestive tract into specific regions is a key characteristic used in classifying animals. The sequence described – mouth, buccal cavity, pharynx, oesophagus, crop, stomach, intestine, rectum, and anus – points towards a specific type of organism.
Analysis of Digestive System Structures
Let's analyze the digestive system of the given options:
- Hirudinaria (Leech): Leeches possess a specialized digestive system adapted for feeding, often on blood. Their system typically includes a mouth, pharynx, esophagus, a prominent crop for storing ingested food (like blood), a distinct stomach for digestion, followed by the intestine, rectum, and anus. The presence of a buccal cavity is also noted. This closely matches the description.
- Pheretima (Earthworm): Earthworms also show differentiation, including a crop and often a gizzard (sometimes referred to broadly as part of the stomach complex) before the intestine. However, the specific details and emphasis in the question might favor the leech.
- Nereis (Marine Annelid): Polychaetes like Nereis generally have a simpler digestive tract without a distinct, enlarged crop typical of leeches or earthworms.
- Ascaris (Roundworm): Nematodes like Ascaris have a much simpler digestive tube consisting of a pharynx, esophagus, intestine, and rectum, lacking specialized structures like a crop or a distinctly differentiated stomach after the esophagus.
Conclusion on Differentiation
The described differentiation, particularly the inclusion of a distinct crop and stomach following the esophagus, is characteristic of the annelid group, specifically leeches like Hirudinaria. This specialized structure supports their feeding habits.
Similar Questions
- Correct sequence of events in mammalian fertilization:
A. Lysis of zona pellucida by sperm
B. Sperm activated by female reproductive tract
C. Acrosomal reaction
D. Fusion of sperm and egg
E. Sperm binds zona pellucida
Choose the correct answer from the options given below: - Correct sequence of events on larval development of Herdmania:
A. The blastopore of embryo closes and rudiment of tail formed
B. The chorion ruptured due to an enzyme secreted by inner follicle cells
C. The archenteron produces presumptive mesoderm as solid band
D. The presumptive notochordal occupy the central core of larva
E. The fully formed free swimming larva is produced
Choose the correct answer from the options given below: - Choose the correct sequence of enzymes involved in the preparatory phase of glycolysis:
A. Hexokinase
B. Phospho-fructo kinase I
C. Phospho-hexose isomerase
D. Aldolase
E. Triose-phosphate Isomerase
Choose the correct answer from the options given below: - Choose the correct sequence of events on short term endocrine response to stress:
A. Hypothalamus
B. Stressor
C. Sympathetic centers
D. Sympathetic nerve & adrenal medulla
E. Adrenaline & nor-adrenaline response
Choose the correct answer from the options given below: - Choose the correct stages in the development of Gastropods to indicate occurrence of torsion:
A. Pre-torsional stage
B. $90^{\circ}$ lateral anti-clockwise torsion
C. Movement of mantle cavity & anus to the right
D. Larva with ventral flexure in exo-gastric shell
E. $90^{\circ}$ torsion clockwise - Adult stage
Choose the correct answer from the options given below: - Choose the correct sequence of events during a Cardiac cycle:
A. SA (Sino-Atrial) node
B. Atrial depolarization
C. Conduction through AV (Atrio-Ventricular) node
D. Ventricular repolarization
E. Ventricular depolarization
Choose the correct answer from the options given below: - Which of the following statements are correct:
A. Phosphorylation of mannose residues is a critical step in sorting lysosomal proteins
B. Phosphorylated mannose residues are recognized by a mannose-6-phosphate receptor in the cis Golgi network
C. N-linked glycosylation takes place in both endoplasmic reticulum and Golgi body
D. O-linked glycosylation occurs entirely in Golgi body
Choose the correct answer from the options given below: - Which of the following statements are correct:
A. In bacteria, RNA primers are removed by the action of polymerase II.
B. In bacteria, polymerase III synthesizes both leading and lagging strands of DNA.
C. In eukaryotes, Polymerases $\delta$ is responsible for synthesis of the lagging strand.
D. In eukaryotes, Polymerases $\varepsilon$ is responsible for synthesis of leading strands.
Choose the correct answer from the options given below: - Which of the following amino acids are encoded by only one codon:
A. Methionine
B. Tyrosine
C. Tryptophan
D. Arginine
Choose the correct answer from the options given below: - Which of the following statements are correct:
A. RNA polymerase I transcribes all ribosomal rRNAs genes
B. RNA polymerase I and III transcribes all ribosomal rRNAs genes
C. RNA polymerase III transcribes genes for tRNAs
D. RNA polymerase III also transcribes microRNAs (miRNAs) and long noncoding RNAs (lncRNAs)
Choose the correct answer from the options given below:
Important Questions from Mixed Topic (CUET PG)
- Who was the founder of Bolshevik Communist party?
- What is the key guide to statecraft in the realist tradition?
- Chronologically arrange the events in the Cold War period.
A. Berlin Wall is constructed
B. Communist China joins the UN
C. Soviet invasion of Czechoslovakia
D. Berlin Blockade
Choose the correct answer from the options given below: Morgenthau's principles of political realism are:
A. Politics is rooted in permanent and unchanging human nature which is basically self centred, self-regarding and self-interested
B. Politics is an autonomous sphere of action and cannot therefore be reduced to morals
C. International Politics is an arena of conflicting self-interests
D. The ethics of international relations is situational ethics which is very different from private morality
Choose the correct answer from the options given below:Who among the following political thinkers consider the anarchical self help system to be a compelling factor for States to maximise their relative power positions?
