What do the Mammary alveoli secrete?
Milk correct as per What do the Mammary alveoli secrete? biology principle.
Ref: NCERT Biology Class XII — Human Reproduction and Reproductive Health
#human biology
11 public questions tagged with this topic.
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Which protein is most abundant in the human body?
Collagen is the most abundant protein in the human body, providing structural support to connective tissues. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, ph
Which of the following WBCs is the most abundant in human blood?
Neutrophils are the most abundant WBCs, constituting about 60-65% of total leukocytes. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Which of the following bones is the longest in the human body?
The femur (thigh bone) is the longest and strongest bone in the human body. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.
Which of the following bones is a part of the pelvic girdle?
The ilium is a part of the pelvic girdle, while the humerus, scapula, and clavicle are part of the appendicular skeleton​. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Structural Organisation in Animals and Frog, Topic: Tissues, skeletal and organ systems.
What is the main function of the pleural fluid in the lungs?
Pleural fluid reduces friction between the lung surface and the thoracic cavity during breathing. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
Which of the following is a function of the lymphatic system?
The lymphatic system removes interstitial fluid, transports lymphocytes, and helps in immune defense. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Human Health and Disease, Topic: Immunity, diseases and health maintenance.
What is the primary function of the pulmonary artery?
The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for oxygenation. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
What does the presence of vestigial gill slits in human embryos suggest?
Vestigial gill slits in human embryos suggest common ancestry with aquatic organisms like fishes.
Ref: NCERT Class 12 Biology Chapter 6: Evolution Evidences of Evolution - Paleontological and Comparative Anatomy
Which of the following statements regarding excretion in humans is incorrect?
Skin plays a role in excretion by eliminating small amounts of urea and salts through sweat.
Ref: NCERT Class 11 Biology Chapter 16: Excretory Products and their Elimination Micturition Disorders and Accessory Excretory Organs
