50 Most Important NEET PYQs of Chapter 7: Structural Organisation in Animals – Part 1 (Q1–25) | By neetpyqall

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🧬 50 Most Important NEET PYQs of Chapter 7: Structural Organisation in Animals – Part 1 (Q1–25) | By neetpyqall

This blog brings you the first 25 most important NEET previous year questions from the chapter Structural Organisation in Animals, with detailed explanations for every answer. Get ready to master the key concepts with clarity!

1. Which one of the following is not a connective tissue?

A) Blood
B) Bone
C) Cartilage
D) Muscle
✅ Answer: D) Muscle
Explanation: Muscles are part of muscular tissue, not connective tissue. Blood, bone, and cartilage are all connective tissues.

2. A common characteristic of connective tissue is:

A) Tightly packed cells
B) No intercellular space
C) Cells scattered in a matrix
D) Presence of chloroplast
✅ Answer: C) Cells scattered in a matrix
Explanation: Connective tissue cells are widely spaced and embedded in an abundant extracellular matrix.

3. Blood is considered a connective tissue because:

A) It contains collagen
B) It has matrix and connects body systems
C) It supports organs
D) It has calcium salts
✅ Answer: B) It has matrix and connects body systems
Explanation: Blood is a fluid connective tissue with a liquid matrix (plasma) that connects various parts of the body.

4. Which of the following is an example of a simple epithelium?

A) Skin
B) Wall of alveoli
C) Sweat gland
D) Intestinal villi
✅ Answer: B) Wall of alveoli
Explanation: Simple squamous epithelium, which is thin and single-layered, forms the alveolar walls allowing gas exchange.

5. Which of these animals shows metameric segmentation?

A) Hydra
B) Earthworm
C) Cockroach
D) Sponge
✅ Answer: B) Earthworm
Explanation: Earthworms exhibit true metamerism, with body segmentation both externally and internally.

6. The characteristic feature of compound epithelium is:

A) Absorption
B) Filtration
C) Protection
D) Secretion
✅ Answer: C) Protection
Explanation: Compound epithelium has multiple layers and is mainly protective in function (e.g., skin, esophagus lining).

7. In which of the following connective tissues do we find chondrocytes?

A) Bone
B) Cartilage
C) Blood
D) Areolar
✅ Answer: B) Cartilage
Explanation: Chondrocytes are the living cells present in cartilage, situated in lacunae.

8. Ligaments connect:

A) Bone to bone
B) Muscle to bone
C) Muscle to muscle
D) None of these
✅ Answer: A) Bone to bone
Explanation: Ligaments are strong, fibrous connective tissues that link bones at joints.

9. The excretory organ of earthworm is:

A) Flame cell
B) Nephridia
C) Malpighian tubule
D) Antennal gland
✅ Answer: B) Nephridia
Explanation: Nephridia in earthworms function like kidneys to remove metabolic wastes.

10. Which tissue makes up the lining of the kidney tubules?

A) Cuboidal epithelium
B) Columnar epithelium
C) Ciliated epithelium
D) Squamous epithelium
✅ Answer: A) Cuboidal epithelium
Explanation: Cuboidal epithelium forms the lining of kidney tubules and assists in absorption and secretion.

11. Presence of canal system is a characteristic of:

A) Cnidaria
B) Porifera
C) Platyhelminthes
D) Mollusca
✅ Answer: B) Porifera
Explanation: Poriferans (sponges) possess a canal system for water circulation and food collection.

12. Malpighian tubules in cockroach open into:

A) Hepatic caeca
B) Hindgut
C) Midgut
D) Foregut
✅ Answer: B) Hindgut
Explanation: Malpighian tubules open into the hindgut and are involved in excretion and osmoregulation.

13. Compound eyes of cockroach are made of:

A) Lenses
B) Ommatidia
C) Retina
D) Rhodopsin
✅ Answer: B) Ommatidia
Explanation: Compound eyes are composed of numerous units called ommatidia, providing a mosaic vision.

14. The function of intercalated discs is to:

A) Connect smooth muscle cells
B) Transmit impulses in cardiac muscles
C) Attach muscles to bone
D) Initiate peristalsis
✅ Answer: B) Transmit impulses in cardiac muscles
Explanation: Intercalated discs help in synchronized contraction by facilitating communication between cardiac muscle cells.

15. Which connective tissue connects muscle to bone?

A) Cartilage
B) Ligament
C) Tendon
D) Areolar
✅ Answer: C) Tendon
Explanation: Tendons are fibrous connective tissues that attach muscles to bones.

16. Body of cockroach is divisible into:

A) Head and trunk
B) Head, thorax, abdomen
C) Head and abdomen
D) Thorax and abdomen
✅ Answer: B) Head, thorax, abdomen
Explanation: Like all insects, cockroaches have a body divided into three regions: head, thorax, and abdomen.

17. Septal nephridia in earthworm are present on which septa?

A) 4/5 to 8/9
B) 7/8 to 15/16
C) 15/16 to the last
D) 26/27 to the last
✅ Answer: C) 15/16 to the last
Explanation: Septal nephridia are found from the 15th/16th segment to the last in earthworms and are excretory in nature.

18. Which of the following is NOT a part of the cockroach alimentary canal?

A) Crop
B) Gizzard
C) Malpighian tubule
D) Hepatic caeca
✅ Answer: C) Malpighian tubule
Explanation: Malpighian tubules are excretory organs, not a part of the digestive system.

19. Muscles of limbs in humans are:

A) Voluntary
B) Involuntary
C) Cardiac
D) Smooth
✅ Answer: A) Voluntary
Explanation: Skeletal muscles that move the limbs are voluntary and under conscious control.

20. Compound epithelium is mainly concerned with:

A) Protection
B) Absorption
C) Secretion
D) Reproduction
✅ Answer: A) Protection
Explanation: With multiple cell layers, compound epithelium provides mechanical and chemical protection.

21. Haemocoel is found in:

A) Earthworm
B) Cockroach
C) Frog
D) Leech
✅ Answer: B) Cockroach
Explanation: Arthropods like cockroach have an open circulatory system with haemocoel as the body cavity.

22. Which one is not matched correctly?

A) Earthworm – Nephridia
B) Cockroach – Malpighian tubules
C) Frog – Flame cells
D) Hydra – Cnidoblasts
✅ Answer: C) Frog – Flame cells
Explanation: Flame cells are found in flatworms, not frogs. Frogs have kidneys for excretion.

23. Which of the following epithelial tissues is involved in absorption?

A) Stratified
B) Columnar
C) Squamous
D) Cuboidal
✅ Answer: B) Columnar
Explanation: Columnar epithelium lines the intestine and helps in absorption due to its tall structure.

24. Which part of cockroach contains the nerve ring?

A) Head
B) Thorax
C) Abdomen
D) Both A and B
✅ Answer: A) Head
Explanation: The nerve ring, composed of the brain and circumoesophageal connectives, is located in the head.

25. Which epithelial tissue lines the fallopian tubes?

A) Ciliated columnar
B) Cuboidal
C) Simple squamous
D) Stratified squamous
✅ Answer: A) Ciliated columnar
Explanation: Ciliated columnar epithelium helps move the egg through the fallopian tubes.

📌 Stay tuned for Part 2 (Q26–50) of this chapter in the next blog!

For more NEET-targeted biology content:
🔗 neetpyqall.blogspot.com
🔗 biologyatease1.blogspot.com


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