Phylum : Hemichordata Notes, Examples & NEET MCQs (Class 11 Biology)
By Pavan Chaturvedi
Welcome to Chaubey Biology Hub, your premier destination for high-quality, NCERT-aligned medical entrance preparation. We take pride in delivering content that doesn't just mirror textbooks but decodes them. This guide on Phylum : Hemichordata Notes, Examples & NEET MCQs (Class 11 Biology) is meticulously crafted to meet the rigorous standards of the NTA NEET-UG syllabus, focusing exclusively on the core concepts that matter most."
Before diving into the Phylum : Hemichordata Notes, Examples & NEET MCQs (Class 11 Biology) ensure you have gone through comprehensive guide on Phylum Echinodermata: Notes, Examples & NEET MCQs (Class 11 Biology)
Table of Contents
- 📌 Phylum Hemichordata: Definition
- 📌 General Features of Hemichordata
- 📌 Video Lecture & Timestamps
- 📌 Important Examples of Hemichordata
- 📌 Conclusion
- 📌 NEET Practice MCQs (Challenge)
Phylum Hemichordata: Definition
- Hemichordates are marine invertebrate worm like animals.
- This is phylum which has close relationship with chordates and Echinodermata.
- Hemichordata were considered as chordates but now put in a separate phylum under non chordata.
💡 Quick Navigation: Back to [NEET Biology Full Course Hub] for more Unit-wise Study Material."
General Features of Hemichordata
- Hemichordates have a rudimentary structure in collar region called stomochord which is similar to notochord.
- Animals are worm like, marine with organ system level organisation.
- They are bilateral symmetrical, Triploblastic and Coelomate animals.
- Their Animals are cylindrical and body is divided into proboscis , Collar and trunk.
- Circulatory system is open type.
- Respiration takes place by gills.
- Excretion take place by Proboscis glands.
- Saxes are separated. Fertilisation are external. Development is indirect.
Video lecture and Timestamp
📌 Video Highlights & Quick Navigation:
🔥 NEET Flashcards: Hemichordata
- 📍 Habitat: Exclusively Marine
- 📍 Excretory Organ: Proboscis Gland (NEET MCQ ✅)
- 📍 Circulation: Open Type
- 📍 Larva: Tornaria Larva
- 📍 Notochord: Absent (Only Stomochord present)
Important Examples of Hemichordata
Balanoglossus
- It is also known as Acorn worm.
- It is deuterostome because anus is developed before mouth.
- It is worm like animals marine animals.
- Body is divided into proboscis, Collar and trunk.
🦁 Zoology Shortcut: > Master all Animal Phyla from Porifera to Chordata with our easy-to-remember comparison tables: 👉 Animal Kingdom: High-Yield Module- The alimentary canal is straight starting from mouth and ending with anus.
- It has U shaped paired gills slit.
- Notochord is present on upper part of body without nerve chord.
- Saxes are separated. Fertilisation are external. Development is indirect.
Saccoglossus
- It is soft body animals and body is divided into Proboscis collar trunk.
- It is found in spirally coiled burrow in ocean.
- It uses its proboscis to push the body on sand.
Comparison table between Hemichordata and Chordata
| Feature | Hemichordata | Chordata |
|---|---|---|
| Notochord | Absent (Stomochord present) | Present |
| Nervous System | Intra-epidermal | Central (Dorsal & Hollow) |
| Body Parts | Proboscis, Collar, Trunk | Head, Thorax, Abdomen |
- Mouth is located internally at junction of Proboscis and collar.
- The gills are located internally in trunk region.
- It has Glomerulus in proboscis which filter and release the excretory waste.
- The egg are converted into tornaria larva which undergo metamorphosis into young animals.
Conclusion :
- Although Hemichordata is a small phylum, it is a goldmine for NEET aspirants. Understanding the structural nuances ofo the Stomochord and the functional role of the Proboscis gland is essential for scoring full marks in Animal Kingdom.
- We hope this guide and the accompanying video helped clarify your concepts.
- Make sure to revise the comparison table regularly to avoid confusion between Hemichordates and Chordates.
- If you have any questions, feel free to drop a comment below. Keep hustling, and good luck with your NEET journey!
To understand the detail information about the Phylum Chordata: NCERT Biology Notes, Classification & MCQs for NEET read my next detailed guide: .
🎯 NEET MULTIPLE CHOICE QUESTIONS
🔥 100% CHALLENGE
"Questions yahi se aayega... taiyari jeet ki!"
1. Which of the following phylum were earlier considered as chordates but now is a non chordates under separate phylum.
A. Echinodermata
B. Hemichordata
C. Mollusca
D. Urochordata
A. Echinodermata
B. Hemichordata
C. Mollusca
D. Urochordata
Answer: B
2. Which of the following structure is present in Hemichordates as rudimentary.
A. Spinal cordB. Nerve cord
C. Notochord
D. Stomochord
Answer: D
3. Stomochord is present in Hemichordates in
A. Proboscis region
B. Collar region
C.Trunk region
D. Glomerulus
Answer: B
4.Which one of the following statement is not correct with respect to Hemichordates.
A. They are worm like and present in both fresh and marine water.
B. They are Triploblastic and have bilateral symmetry.
C. They are true Coelomate with organ system of body organisation.
D. They have stomochord which seem like notochord.
Answer: A
5.Body of Hemichordates is divided into
A. Proboscis collar and trunk
B. Head and trunk
C. Thorax and abdomen
D. Head, foot and visceral hump
Answer: A
6. Hemichordates respires by
A. Trachea B. Gills
C. Spiracle D.lungs
Answer: B
7. Proboscis glands in Hemichordates is involved in
A. Respiration
B. Excretion
C.Transportation
D. Locomotion
Answer: B
8. Consider the following features of Hemichordata and select the correct code
1. Open circulatory system
2. External fertilisation
3. Separated sex
4. Indirect development
A. 1 2 and 3
B. 2 3 and 4
C. 1 3 and 4
D. 1 2 3 and 4
Answer: D
9. Which of the following animals belong to Hemichordata.
A. Ctenoplana & Pleurobranchia
B. Balanoglossus & Pleurobra chia
C. Saccoglossus & Pleurobranchia
D. Balanoglossus and Saccoglossus
Answer: D
10. Identify the number 1 and 2 in given Diagram
A. Proboscis and Collar
B. Collar and trunk
C. Proboscis and trunk
D. Collar and trunk
Answer: A
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