Science Group
Explore subjects and practice MCQs
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Total MCQs
Unit-5 Tissues Organs and Organ Systems
Answer: Lymphocytes, a type of white blood cell, produce antibodies to fight infection.
Answer: Bone is a connective tissue with a hard matrix of calcium salts; the others are epithelial, muscular and nervous tissues.
Answer: Cartilage is a flexible, semi-rigid tissue found at joints and in the ear and nose.
Answer: Cardiac muscle cells are branched and joined end to end by intercalated discs.
Answer: Tracheids and vessels of xylem are dead, hollow cells that conduct water and minerals.
Answer: Sieve tubes transport prepared food (sugars) from leaves to all parts of the plant.
Answer: In older stems and roots, the epidermis is replaced by cork, a waterproof protective tissue.
Answer: Thin squamous epithelium allows rapid exchange of substances such as oxygen and carbon dioxide.
Answer: Goblet cells secrete mucus, which lubricates and protects the lining of organs like the respiratory and digestive tracts.
Answer: The circulatory system transports oxygen and carbon dioxide in the blood between lungs and tissues.
Answer: The digestive system breaks down food mechanically and chemically into absorbable simple substances.
Answer: The brain, spinal cord and nerves form the nervous system that coordinates body activities.
Answer: Blood cells are formed mainly in the red bone marrow present inside bones.
Answer: Plasma is the fluid that carries digested food, hormones, gases and waste products in the blood.
Answer: Epithelial tissue has no blood vessels of its own; it gets nutrients by diffusion from underlying tissues.
Answer: The heart is a muscular organ that pumps blood through the circulatory system.
Answer: The muscular system produces movement as its muscles contract and relax.
Answer: The skeleton supports the body and protects vital organs such as the brain, heart and lungs.
Answer: Ovaries and testes are the reproductive organs that produce gametes and sex hormones.
Answer: Cardiac muscle is involuntary and striated, and its branched fibres are joined by intercalated discs.