The structural and functional unit of the nervous system is –
(A) Brain
(B) Neuron
(C) Spinal cord
(D) Axon
Answer: (B)

Which part of the human brain is responsible for coordination of movement and balance?
(A) Cerebellum
(B) Cerebrum
(C) Medulla
(D) Pons
Answer: (A)

Which blood cells help in clotting?
(A) White blood cells
(B) Red blood cells
(C) Platelets
(D) Plasma
Answer: (C)

Which part of the flower contains ovules?
(A) Anther
(B) Filament
(C) Ovary
(D) Petal
Answer: (C)

Which vitamin is produced in the skin by sunlight?
(A) Vitamin A
(B) Vitamin C
(C) Vitamin D
(D) Vitamin E
Answer: (C)

Which of these is a warm-blooded animal?
(A) Lizard
(B) Fish
(C) Frog
(D) Bird
Answer: (D)

Which organ filters blood in the human body?
(A) Liver
(B) Kidney
(C) Heart
(D) Lung
Answer: (B)

Which is the longest bone in the human body?
(A) Tibia
(B) Femur
(C) Humerus
(D) Radius
Answer: (B)

Which part of the brain controls involuntary actions?
(A) Cerebrum
(B) Medulla oblongata
(C) Cerebellum
(D) Thalamus
Answer: (B)

Which pigment provides green color to plants?
(A) Chlorophyll
(B) Xanthophyll
(C) Carotene
(D) Anthocyanin
Answer: (A)

Which process removes carbon dioxide from the body?
(A) Digestion
(B) Respiration
(C) Circulation
(D) Exhalation
Answer: (D)

What is the function of lymph?
(A) Transport oxygen
(B) Fight infection
(C) Clot blood
(D) Remove toxins
Answer: (B)

How many pairs of chromosomes are found in human cells?
(A) 22
(B) 23
(C) 24
(D) 46
Answer: (B)

Which of the following helps regulate body temperature?
(A) Liver
(B) Skin
(C) Kidney
(D) Lungs
Answer: (B)

Which plant part conducts food?
(A) Xylem
(B) Phloem
(C) Cambium
(D) Cortex
Answer: (B)

Which of these is a sexually transmitted disease?
(A) Influenza
(B) Tuberculosis
(C) AIDS
(D) Typhoid
Answer: (C)

What is the color of oxygenated blood?
(A) Dark red
(B) Blue
(C) Bright red
(D) Yellow
Answer: (C)

Which hormone is secreted by adrenal glands?
(A) Insulin
(B) Adrenaline
(C) Estrogen
(D) Thyroxine
Answer: (B)

The muscle attached to the bone is called –
(A) Voluntary muscle
(B) Involuntary muscle
(C) Smooth muscle
(D) Cardiac muscle
Answer: (A)

Which of the following organs produces bile?
(A) Pancreas
(B) Liver
(C) Gallbladder
(D) Stomach
Answer: (B)

The universal donor blood group is –
(A) A
(B) AB
(C) B
(D) O
Answer: (D)

Which organelle is responsible for packaging proteins?
(A) Ribosome
(B) Golgi apparatus
(C) Mitochondria
(D) Lysosome
Answer: (B)

Which process helps in the formation of gametes?
(A) Mitosis
(B) Meiosis
(C) Cytokinesis
(D) Binary fission
Answer: (B)

Which of the following is a vestigial organ in humans?
(A) Kidney
(B) Liver
(C) Appendix
(D) Heart
Answer: (C)

The valve located between the left atrium and left ventricle is –
(A) Tricuspid valve
(B) Bicuspid valve
(C) Aortic valve
(D) Pulmonary valve
Answer: (B)

Which vitamin is essential for good eyesight?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
(D) Vitamin D
Answer: (A)

Which is the main nitrogenous waste excreted by humans?
(A) Uric acid
(B) Ammonia
(C) Urea
(D) Creatinine
Answer: (C)

Which part of the cell is responsible for cell division?
(A) Cytoplasm
(B) Nucleus
(C) Golgi body
(D) Mitochondria
Answer: (B)

Which hormone regulates water balance in the body?
(A) Insulin
(B) ADH
(C) Oxytocin
(D) Estrogen
Answer: (B)

Which is a fungal disease?
(A) Malaria
(B) Ringworm
(C) Typhoid
(D) Influenza
Answer: (B)

Which organ is known as the ‘graveyard of RBCs’?
(A) Liver
(B) Spleen
(C) Kidney
(D) Bone marrow
Answer: (B)

Which of the following nutrients builds and repairs tissues?
(A) Carbohydrates
(B) Proteins
(C) Fats
(D) Vitamins
Answer: (B)

Which plant hormone is known as stress hormone?
(A) Auxin
(B) Abscisic acid
(C) Cytokinin
(D) Gibberellin
Answer: (B)

What is the main function of red blood cells?
(A) Clot blood
(B) Fight infections
(C) Carry oxygen
(D) Absorb nutrients
Answer: (C)

Which mineral strengthens bones and teeth?
(A) Iron
(B) Calcium
(C) Potassium
(D) Sodium
Answer: (B)

Which vitamin deficiency causes bleeding gums?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
(D) Vitamin D
Answer: (C)

Which part of the flower produces male gametes?
(A) Ovary
(B) Anther
(C) Petal
(D) Style
Answer: (B)

The covering of the heart is called –
(A) Peritoneum
(B) Pleura
(C) Pericardium
(D) Myocardium
Answer: (C)

Which is the only artery that carries deoxygenated blood?
(A) Pulmonary artery
(B) Aorta
(C) Coronary artery
(D) Renal artery
Answer: (A)

Which enzyme is present in saliva?
(A) Pepsin
(B) Ptyalin
(C) Lipase
(D) Trypsin
Answer: (B)

Which structure in the cell controls all activities?
(A) Nucleus
(B) Cytoplasm
(C) Ribosome
(D) Lysosome
Answer: (A)

The outer layer of the skin is called –
(A) Dermis
(B) Hypodermis
(C) Epidermis
(D) Endodermis
Answer: (C)

Which disease is caused by lack of insulin?
(A) Anemia
(B) Diabetes
(C) Rickets
(D) Scurvy
Answer: (B)

Which type of muscles are found in the heart?
(A) Voluntary
(B) Smooth
(C) Cardiac
(D) Skeletal
Answer: (C)

The smallest bone in the human body is –
(A) Stapes
(B) Femur
(C) Ulna
(D) Radius
Answer: (A)

The outermost layer of a plant root is –
(A) Cortex
(B) Epidermis
(C) Endodermis
(D) Pericycle
Answer: (B)

Which gland regulates metabolism?
(A) Pancreas
(B) Thyroid
(C) Pituitary
(D) Adrenal
Answer: (B)

The bone protecting the brain is –
(A) Rib
(B) Skull
(C) Sternum
(D) Vertebra
Answer: (B)

The hormone responsible for growth is –
(A) Estrogen
(B) Growth hormone
(C) Insulin
(D) Progesterone
Answer: (B)

Which is the master gland of the endocrine system?
(A) Thyroid
(B) Pituitary
(C) Pancreas
(D) Adrenal
Answer: (B)