Practice: Coordination & Control
Coordination in Animals – Nervous and Endocrine Systems
Q1: Coordination in animals mainly means:
A) Only growth of body parts
B) Only digestion of food
C) Proper working together of different organs in response to stimuli
D) Only excretion of waste materials
Q2: The basic structural and functional unit of the nervous system is:
A) Nephron
B) Neuron
C) Alveolus
D) Sarcomere
Q3: Which part of the human brain controls thinking, memory and intelligence?
A) Cerebellum
B) Medulla oblongata
C) Cerebrum
D) Pons varolii
Q4: Reflex action is best described as:
A) Slow, voluntary action controlled by cerebrum
B) Quick, automatic response controlled mainly by spinal cord
C) Action always controlled by endocrine glands
D) Movement that never involves nerves
Q5: In a simple reflex arc, the correct order of elements is:
A) Effector → receptor → motor neuron → brain
B) Receptor → sensory neuron → relay neuron → motor neuron → effector
C) Brain → motor neuron → sensory neuron → effector
D) Receptor → motor neuron → relay neuron → sensory neuron → effector
Q6: Endocrine glands are different from exocrine glands because endocrine glands:
A) Always have ducts
B) Pour secretions directly into blood
C) Only secrete digestive juices
D) Never produce hormones
Q7: The gland called “master gland” of the body is:
A) Thyroid
B) Adrenal
C) Pituitary
D) Pancreas
Q8: Thyroxine hormone is produced by:
A) Thyroid gland
B) Pituitary gland
C) Adrenal gland
D) Testes only in males
Q9: Which hormone controls the blood sugar level in humans?
A) Adrenaline
B) Insulin
C) Thyroxine
D) Estrogen
Q10: Adrenaline hormone helps the body mainly during:
A) Deep sleep only
B) Normal digestion of food
C) Emergency situations like fear, anger or stress
D) Only during wound healing after injury
Control in Plants – Hormones, Tropic and Nastic Movements
Q11: Which plant hormone is mainly responsible for cell elongation and bending of shoots towards light?
A) Auxin
B) Gibberellin
C) Cytokinin
D) Abscisic acid (ABA)
Q12: Abscisic acid (ABA) in plants generally:
A) Promotes fruit ripening
B) Promotes stem elongation only
C) Inhibits growth and helps in closing stomata during water stress
D) Always increases rate of cell division in roots
Q13: Ethylene in plants is most closely associated with:
A) Ripening of fruits
B) Formation of lateral roots
C) Seed dormancy
D) Only elongation of internodes in sugarcane
Q14: Which type of movement is shown when a shoot grows towards the source of light?
A) Geotropism
B) Hydrotropism
C) Phototropism
D) Thigmonasty
Q15: Growth of roots towards the centre of the earth (downwards) is an example of:
A) Positive geotropism
B) Negative geotropism
C) Positive phototropism
D) Hydronasty without any growth
Q16: Bending of roots towards a region where water is more available in soil is called:
A) Phototropism
B) Hydrotropism
C) Chemotropism
D) Thigmotropism only in climbers
Q17: Coiling of pea plant tendrils around a support is an example of:
A) Phototropism
B) Thigmotropism
C) Geotropism
D) Photonasty only in flower petals
Q18: Leaves of Mimosa pudica (touch-me-not) fold up when touched. This is an example of:
A) Phototropism
B) Thigmonasty (seismonasty)
C) Hydrotropism
D) Chemotropism of pollen tubes
Q19: Which statement correctly distinguishes tropic and nastic movements?
A) Both always depend on direction of stimulus
B) Tropic movement does not involve growth; nastic always involves growth
C) Tropic movement depends on direction of stimulus; nastic movement does not
D) Nastic movement occurs only in animals, not in plants at all
Q20: Opening of petals in morning and closing at night in many flowers is an example of:
A) Geotropism
B) Photonasty
C) Thigmotropism
D) Chemotropism only in roots