50 Most Important NEET PYQs of Chapter 7: Structural Organisation in Animals – Part 2 (Q26–50) | By neetpyqall

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🧬 50 Most Important NEET PYQs of Chapter 7: Structural Organisation in Animals – Part 2 (Q26–50) | By neetpyqall

Welcome to Part 2 of the most important NEET Previous Year Questions from the chapter Structural Organisation in Animals. Let's dive into questions 26 to 50 with detailed explanations to help you ace this chapter!

26. Which structure is present in the male reproductive system of a cockroach?

A) Mushroom gland
B) Spermatheca
C) Ovary
D) Oviduct
✅ Answer: A) Mushroom gland
Explanation: The mushroom gland is a part of the male reproductive system of cockroach and helps in formation of spermatophores.

27. What is the type of circulatory system in earthworm?

A) Open
B) Closed
C) Absent
D) Lymphatic
✅ Answer: B) Closed
Explanation: Earthworm has a closed circulatory system where blood is confined to blood vessels.

28. Pheromones in cockroach are released by:

A) Maxillary palps
B) Antennae
C) Glands in abdomen
D) Anal cerci
✅ Answer: C) Glands in abdomen
Explanation: Pheromones are chemical messengers released from abdominal glands in cockroaches for mating signals.

29. The body of cockroach is covered with:

A) Mucous
B) Chitin
C) Cellulose
D) Calcium carbonate
✅ Answer: B) Chitin
Explanation: The exoskeleton of cockroach is made of chitin, a tough, protective polysaccharide.

30. Typhlosole is present in:

A) Hydra
B) Cockroach
C) Earthworm
D) Leech
✅ Answer: C) Earthworm
Explanation: The typhlosole is an internal fold in the intestine of the earthworm that increases surface area for absorption.

31. Which organ in cockroach grinds food?

A) Crop
B) Gizzard
C) Midgut
D) Foregut
✅ Answer: B) Gizzard
Explanation: The gizzard (or proventriculus) has chitinous plates that help grind the food in cockroaches.

32. Which connective tissue does not contain fibers?

A) Bone
B) Areolar
C) Blood
D) Cartilage
✅ Answer: C) Blood
Explanation: Blood is a fluid connective tissue and lacks collagen or elastic fibers typically found in other connective tissues.

33. The exoskeleton of cockroach is formed by:

A) Cutin
B) Keratin
C) Chitin
D) Cellulose
✅ Answer: C) Chitin
Explanation: The exoskeleton of arthropods like cockroaches is made of chitin, a nitrogen-containing polysaccharide.

34. Spermatheca in female cockroach stores:

A) Eggs
B) Sperms
C) Embryos
D) Hormones
✅ Answer: B) Sperms
Explanation: Spermatheca is a sac-like structure in females that stores sperms received from the male during mating.

35. Which among the following is an example of voluntary muscle?

A) Intestinal wall muscle
B) Cardiac muscle
C) Muscle in biceps
D) Muscle in iris
✅ Answer: C) Muscle in biceps
Explanation: Biceps are skeletal muscles under voluntary control.

36. The functional unit of striated muscle is called:

A) Sarcolemma
B) Myofibril
C) Sarcomere
D) Fascicle
✅ Answer: C) Sarcomere
Explanation: Sarcomere is the structural and functional unit of striated muscle, responsible for contraction.

37. Notochord is present in:

A) Cockroach
B) Earthworm
C) Frog
D) Leech
✅ Answer: C) Frog
Explanation: Frog is a chordate and has a vertebral column derived from notochord. The others are invertebrates.

38. Muscles are attached to bones by:

A) Ligaments
B) Cartilage
C) Tendons
D) Areolar tissue
✅ Answer: C) Tendons
Explanation: Tendons are tough connective tissues that connect muscles to bones.

39. Intercalated discs are found in:

A) Skeletal muscle
B) Smooth muscle
C) Cardiac muscle
D) Voluntary muscle
✅ Answer: C) Cardiac muscle
Explanation: These discs allow quick transmission of signals across cardiac muscle cells for rhythmic contraction.

40. Which of the following secretes chitin in cockroach?

A) Hypodermis
B) Epidermis
C) Exoskeleton
D) Cuticle
✅ Answer: A) Hypodermis
Explanation: The hypodermis is the epithelial layer that secretes the chitinous exoskeleton in arthropods.

41. The blood of cockroach lacks:

A) Haemoglobin
B) Plasma
C) White blood cells
D) Water
✅ Answer: A) Haemoglobin
Explanation: Cockroach blood (haemolymph) lacks haemoglobin and does not transport gases.

42. The number of segments in an adult earthworm is approximately:

A) 80
B) 100-120
C) 30
D) 60
✅ Answer: B) 100–120
Explanation: Earthworms have around 100–120 metameric segments.

43. Which part of the cockroach brain is associated with compound eyes?

A) Supra-oesophageal ganglion
B) Sub-oesophageal ganglion
C) Circum-oesophageal connectives
D) Ventral nerve cord
✅ Answer: A) Supra-oesophageal ganglion
Explanation: This is the main brain center and controls the compound eyes and antennae.

44. Earthworm respires through:

A) Gills
B) Trachea
C) Skin
D) Lungs
✅ Answer: C) Skin
Explanation: Earthworms respire through their moist skin by diffusion.

45. Cardiac muscles are found in:

A) Stomach
B) Heart
C) Lungs
D) Intestine
✅ Answer: B) Heart
Explanation: Cardiac muscle is exclusive to the heart and shows rhythmic contraction.

46. Which structure helps in locomotion in earthworm?

A) Setae
B) Cilia
C) Flagella
D) Nephridia
✅ Answer: A) Setae
Explanation: Earthworms move using tiny bristle-like structures called setae on their body segments.

47. Function of anal cerci in cockroach is:

A) Excretion
B) Sound detection
C) Movement
D) Touch and vibration detection
✅ Answer: D) Touch and vibration detection
Explanation: Anal cerci are sensory structures that help detect vibrations and potential danger.

48. Muscles which operate without our will are:

A) Skeletal
B) Smooth
C) Striated
D) Voluntary
✅ Answer: B) Smooth
Explanation: Smooth muscles are involuntary and are found in organs like intestine, bladder, etc.

49. The hemocoel in cockroach is filled with:

A) Blood
B) Haemolymph
C) Water
D) Plasma
✅ Answer: B) Haemolymph
Explanation: Haemolymph is the circulating fluid in cockroach which combines functions of blood and lymph.

50. Which of the following epithelium lines the stomach and intestine?

A) Squamous
B) Cuboidal
C) Columnar
D) Ciliated
✅ Answer: C) Columnar
Explanation: Columnar epithelium lines the stomach and intestines for secretion and absorption.

🎯 You’ve now completed all 50 most important NEET PYQs from Chapter 7: Structural Organisation in Animals with detailed solutions!

👉 For daily updates, NEET PYQs, and bio hacks, follow:
🔗 neetpyqall.blogspot.com
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