Chapter 4: Organ and Organ Systems in Animals — Online MCQ Test
ZOOLOGY · CLASS 11th · Tamil Nadu State Board
Practice Chapter 4: Organ and Organ Systems in Animals with a free chapter-wise online MCQ test.
This chapter covers: Focusing on animal morphology and anatomy this chapter details model organisms such as earthworm cockroach and frog. Students compare digestive respiratory circulatory nervous and....
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter 4: Organ and Organ Systems in Animals — Important Questions & Answers
Which organ in the earthworm acts as the primary respiratory surface?
- A. Moist skin
- B. Gills
- C. Trachea
- D. Lungs
Answer: A. Moist skin
Earthworms undergo cutaneous respiration, where oxygen diffuses through their thin, moist skin.
Earthworms undergo cutaneous respiration, where oxygen diffuses through their thin, moist skin.
How many segments are present in the body of an adult earthworm?
- A. 50-75
- B. 100-120
- C. 150-180
- D. 200-250
Answer: B. 100-120
An adult earthworm typically consists of 100 to 120 segments arranged in a linear fashion.
An adult earthworm typically consists of 100 to 120 segments arranged in a linear fashion.
What is the function of typhlosole in the intestine of an earthworm?
- A. To store undigested food
- B. To increase the surface area for absorption
- C. To aid in locomotion
- D. To secrete enzymes
Answer: B. To increase the surface area for absorption
The typhlosole is an internal fold of the intestine that significantly increases the surface area for nutrient absorption.
The typhlosole is an internal fold of the intestine that significantly increases the surface area for nutrient absorption.
Why is the circulatory system of an earthworm classified as 'closed'?
- A. Blood flows in open sinuses
- B. Blood is pumped by a heart into vessels
- C. The heart has four chambers
- D. It lacks hemoglobin
Answer: B. Blood is pumped by a heart into vessels
A closed circulatory system means the blood is confined within heart and blood vessels, never entering body cavities.
A closed circulatory system means the blood is confined within heart and blood vessels, never entering body cavities.
In cockroach anatomy, the 'alary muscles' are associated with:
- A. Digestion
- B. Circulation
- C. Respiration
- D. Excretion
Answer: B. Circulation
Alary muscles are fan-shaped muscles that help maintain the circulation of hemolymph through the heart chambers.
Alary muscles are fan-shaped muscles that help maintain the circulation of hemolymph through the heart chambers.