Phototropism is the growth of a plant in response to light. It happens because of a plant hormone called auxin. When light comes from one side, auxin moves to the shaded side of the plant. This causes the cells on that side to grow faster, making the plant bend towards the light.
More Questions on Control and Coordination
1Which of the following is an example of an involuntary action controlled by the medulla?
→ 2A nerve impulse is essentially a flow of:
→ 3The control and coordination in plants is mainly achieved by:
→ 4Which of the following is not a plant hormone?
→ 5What is the role of an olfactoreceptor?
→ 6The part of the human brain that deals with emotions, learning, and memory is primarily the:
→ 7The hormone responsible for the development of secondary sexual characteristics in females is:
→ 8What is the function of cerebrospinal fluid?
→ 9Which of the following is a non-directional movement?
→ 10The endocrine gland located near the stomach that produces digestive enzymes and hormones is the:
→ 11What is the primary role of the motor neurons?
→ 12The response of a plant to gravity is called:
→ 13Which of the following is not a part of the human brain?
→ 14The feedback mechanism that regulates the secretion of hormones like thyroxine is typically:
→ 15Which of these is a plant hormone that promotes stem elongation and cell division?
→ 16What is the role of interneurons (relay neurons) in the reflex arc?
→ 17The specialized tip of a neuron that transmits signals to another neuron or an effector cell is the:
→ 18The thyroid gland secretes a hormone called:
→ 19Which plant hormone helps in the closing of stomata under water stress?
→ 20The growth of a root towards water is an example of:
→ 21Which part of the brain is the main control center for vision?
→ 22A sudden, involuntary response to a stimulus is called a:
→ 23The function of the gustatory receptors is to detect:
→ 24Which of the following statements describes the main difference between plant and animal hormones?
→ 25The condition characterized by abnormally high growth due to excess growth hormone is called:
→ 26Myelin sheath in neurons helps to:
→ 27What is the general direction of nerve impulse transmission within a neuron?
→ 28The ability of living organisms to respond to stimuli is called:
→ 29Which hormone is secreted by the adrenal medulla?
→ 30The part of the human brain that is responsible for our sense of hearing and smell is located in the:
→ 31The immediate cause of the leaves of the 'touch-me-not' plant drooping upon touching is:
→ 32The nervous system primarily uses ______________ signals, while the endocrine system primarily uses ______________ signals.
→ 33Which gland is responsible for secreting sex hormones in females?
→ 34The role of the Pons in the brain is to:
→ 35A plant stem growing towards light shows:
→ 36The main function of taste buds is to:
→ 37The outer protective layer of the brain is called the:
→ 38Which of the following statements about tropic movements is correct?
→ 39A person suffering from diabetes may be advised to take injections of:
→ 40The structure of the brain that connects the two cerebral hemispheres is the:
→ 41The cells that provide support and nutrition to neurons are called:
→ 42Which of these is a response to light in a plant, but is a non-directional movement?
→ 43What happens at the synapse?
→ 44The growth of tendrils around a support is an example of:
→ 45The dropping of leaves in plants in response to cold weather or drought is promoted by:
→ 46Which system prepares the body for action in stressful situations?
→ 47The 'fight or flight' hormone is:
→ 48Which of the following is a feature of hormones?
→ 49What is the main function of the hypothalamus?
→ 50The part of the forebrain specialized for hearing, smell, memory, and emotions is the:
→ 51Diabetes is caused by the inability of the body to produce sufficient:
→ 52Which plant hormone is involved in breaking seed dormancy?
→ 53The role of the 'effector' in a reflex arc is to:
→ 54Which of the following is responsible for converting electrical signals into chemical signals at the synapse?
→ 55What is the role of receptors in the nervous system?
→ 56The peripheral nervous system (PNS) consists of:
→ 57The central nervous system (CNS) includes:
→ 58The junction where an impulse is transmitted from one neuron to another is called a:
→ 59The neuron consists of:
→ 60Which hormone is responsible for the development of secondary sexual characteristics in males?
→ 61Nastic movements in plants are:
→ 62Which part of the brain controls involuntary actions like breathing, heartbeat, and blood pressure?
→ 63The movement of water-sensitive roots towards water is an example of:
→ 64Lack of growth hormone during childhood leads to:
→ 65A plant hormone that promotes cell division is:
→ 66The main function of the spinal cord is to:
→ 67Which of the following hormones is secreted in response to stress or emergency situations?
→ 68The phenomenon of plants bending towards a source of light is called:
→ 69What protects the brain from physical shocks?
→ 70The part of the neuron that receives information from other neurons is the:
→ 71Sensory receptors in the skin that detect touch are called:
→ 72The chemical messengers secreted by endocrine glands are called:
→ 73The main coordinating center of the body is the:
→ 74Which plant hormone inhibits growth and promotes dormancy?
→ 75The hormone that regulates the basal metabolism rate in the body is:
→ 76Root growing downwards into the soil is an example of:
→ 77The cerebrum is the part of the brain responsible for:
→ 78Which of the following is a tropic movement?
→ 79The hormone insulin is secreted by the:
→ 80Touching a hot object and immediately withdrawing the hand is an example of:
→ 81The functional unit of the nervous system is the:
→ 82Which plant hormone promotes fruit ripening?
→ 83Deficiency of iodine in the diet can lead to:
→ 84Which of the following is an involuntary action?
→ 85Which gland is known as the master gland?
→ 86The growth of pollen tubes towards ovules is an example of:
→ 87The gap between two neurons is called a:
→ 88The plant hormone responsible for cell elongation in shoots and phototropism is:
→ 89Which of the following is a component of the reflex arc?
→ 90The main function of the human brain is to:
→ 91The two main systems of control and coordination in higher animals are:
→ 92The regulation of blood pressure and heart rate during an emergency is mainly controlled by:
→ 93Which of the following is an example of a tropic movement in plants?
→ 94Plants use hormones for:
→ 95Which hormone is secreted by the pituitary gland to control the growth of bones and muscles?
→ 96When you touch a hot object, your hand immediately pulls away. This action is coordinated by the:
→ 97The ability to write, speak, and solve problems is controlled by the:
→ 98Which plant hormone delays the aging of leaves?
→ 99The growth of a tendril around a support is due to a differential growth rate between the side in contact with the support and the side away from the support. This is:
→ 100If the optic nerve is damaged, which sensation will be affected?
→ 101The primary difference between a reflex action and walking is that reflex action is:
→ 102A condition characterized by protruding eyes, weight loss, and increased metabolism is due to the overactivity of which gland?
→ 103Which plant hormone is responsible for breaking seed dormancy?
→ 104The relay neurons are found in the:
→ 105Which of the following protects the spinal cord?
→ 106The brain and spinal cord together constitute the:
→ 107Which of the following ensures that a plant grows in the correct direction relative to its environment?
→ 108A patient reports excessive thirst and frequent urination. These symptoms could indicate a problem with the regulation of:
→ 109Which gland produces both hormones and digestive enzymes?
→ 110The role of effectors in the nervous system is to:
→ 111The role of receptors in the nervous system is to:
→ 112Increased secretion of growth hormone in adulthood can lead to:
→ 113If a person has low levels of growth hormone in childhood, they may suffer from:
→ 114The main function of the thyroid gland is to:
→ 115Which part of the brain coordinates the function of various organs in the body?
→ 116The space between the axon terminal of one neuron and the dendrite of another neuron is called the:
→ 117Which of the following is a specialized end of a neuron that releases chemical substances at the synapse?
→ 118The receptors for smell are located in the:
→ 119Which system provides slower responses in animals, but its effects are generally long-lasting?
→ 120Which system provides faster responses in animals, but its effects are generally short-lived?
→ 121The hormone responsible for the 'apical dominance' phenomenon in plants is:
→ 122Which of the following hormones is associated with seed dormancy?
→ 123When a seed germinates, the shoot grows upwards. This is:
→ 124The opening and closing of stomata is regulated by:
→ 125Which movement in plants is non-directional and independent of the direction of stimulus?
→ 126The response of plant roots to move towards water is called:
→ 127Which hormone prepares the uterus for pregnancy?
→ 128The pancreas secretes:
→ 129Which hormone is secreted by the adrenal glands?
→ 130The main function of the hypothalamus is to:
→ 131Which type of neuron carries impulses from the central nervous system to the muscles or glands?
→ 132The insulating sheath around the axon of a neuron is called:
→ 133The longest part of a neuron is typically the:
→ 134Which part of the brain is responsible for interpreting sensations like touch, pain, and temperature?
→ 135Damage to the medulla oblongata would most likely affect:
→ 136The main function of the cerebellum is to:
→ 137Which of the following is a growth-inhibiting hormone in plants?
→ 138The increase in growth of a plant stem due to light is mediated by:
→ 139A plant's root generally shows:
→ 140A plant's shoot generally shows:
→ 141The leaves of the Mimosa pudica plant (touch-me-not) fold up when touched. This is an example of:
→ 142Which of the following is NOT a type of tropism?
→ 143Tendrils coiling around a support is an example of:
→ 144The growth of pollen tubes towards the ovules is an example of:
→ 145The movement of a plant part in response to gravity is called:
→ 146Which gaseous plant hormone is responsible for fruit ripening?
→ 147The plant hormone that inhibits growth and causes wilting of leaves is:
→ 148Which plant hormone promotes cell division?
→ 149Which plant hormone is primarily responsible for stem elongation and seed germination?
→ 150Roots growing downwards into the soil is an example of:
→ 151The bending of a plant shoot towards light is an example of:
→ 152Which plant hormone promotes cell elongation and is responsible for phototropism?
→ 153Which of the following represents a negative feedback mechanism?
→ 154The timing and amount of hormone release are regulated by:
→ 155The female sex hormones are:
→ 156Which of the following is a male sex hormone?
→ 157A person suffering from diabetes has a deficiency of which hormone?
→ 158The hormone that regulates blood sugar levels is:
→ 159Which hormone is released in response to stress or danger, preparing the body for "fight or flight"?
→ 160Deficiency of iodine in the diet can lead to a condition called:
→ 161The hormone responsible for regulating the basal metabolic rate in the body is:
→ 162Which gland is known as the "master gland" because it controls the activity of other endocrine glands?
→ 163Sensory information from the body reaches the brain through the:
→ 164The spinal cord originates from the:
→ 165Which of these is NOT a part of the hindbrain?
→ 166The fluid that protects the brain from mechanical shocks is:
→ 167The brain is protected by a bony box called the:
→ 168The hunger and thirst centers in the brain are located in the:
→ 169Which part of the brain controls voluntary movements?
→ 170Involuntary actions like salivation, vomiting, and blood pressure are controlled by the:
→ 171Which part of the brain is responsible for maintaining posture and balance of the body?
→ 172The main thinking part of the human brain is the:
→ 173Which of the following is an example of a reflex action?
→ 174The quick, spontaneous, and involuntary response to a stimulus is called a:
→ 175Which part of the central nervous system controls reflex actions?
→ 176The components of a reflex arc include all of the following EXCEPT:
→ 177A reflex action is an example of:
→ 178Chemicals that transmit nerve impulses across a synapse are called:
→ 179The pathway of a nerve impulse in a neuron is generally:
→ 180Which part of the neuron receives information?
→ 181The junction between two neurons is called a:
→ 182Which of the following is the structural and functional unit of the nervous system?
→ 183What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
→ 184Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
→ 185How are involuntary actions and reflex actions different from each other?
→ 186What is the need for a system of control and coordination in an organism?
→ 187How does chemical coordination occur in plants?
→ 188Which signals will get disrupted in case of a spinal cord injury?
→ 189What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
→ 190The brain is responsible for (a) thinking. (b) regulating the heart beat. (c) balancing the body. (d) all of the above.
→ 191The gap between two neurons is called a (a) dendrite. (b) synapse. (c) axon. (d) impulse
→ 192Which of the following is a plant hormone? (a) Insulin (b) Thyroxin (c) Oestrogen (d) Cytokinin.
→ 193Why are some patients of diabetes treated by giving injections of insulin?
→ 194How does our body respond when adrenaline is secreted into the blood?
→ 195Why is the use of iodised salt advisable?
→ 196How does chemical coordination take place in animals?
→ 197How do auxins promote the growth of a tendril around a support?
→ 198Give an example of a plant hormone that promotes growth.
→ 199How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
→ 200What are plant hormones?
→ 201What is the role of the brain in reflex action?
→ 202How do we detect the smell of an agarbatti (incense stick)?
→ 203Which part of the brain maintains posture and equilibrium of the body?
→ 204What happens at the synapse between two neurons?
→ 205What is the difference between a reflex action and walking?
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