(d) phototropism Explanation The growth of plant roots towards or away from moisture is called hydrotropism. Plant growth in response to gravitational force is called geotropism. The growth of plants in response to a chemical stimulus is called chemotropism.
Ans is (b) cerebellum Explanation Processing of sensory information is done by the cerebrum. The medulla controls involuntary functions. Pons controls involuntary actions and sensations including touch and pain. It also regulates respiration.
Ans is (c) (ii) and (iii) Explanation: The thinking part of the brain is the forebrain, hence statement I is incorrect. Because the cerebellum controls posture and balance, statement (iv) is wrong.
Answer ——(c) (i) and (iv) Explanation: Statements ii) and iv) are false since sensory neurons are responsible for transmitting signals from muscles to the spinal cord.
Answer : (d) Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle Explanation: Receptors send impulses to sensory neurons. These impulses are sent to the spinal cord, and the motor neuron then relays them to the muscles.
Answer is (b) axonal end Neurotransmitters are released at the axonal end in response to an electric impulse. To transmit the signal, these substances enter the dendrite of an additional neuron.
Answer : (d) axonal end of one neuron to dendritic end of another neuron. \ Explanation: A synaptic gap composed of SYNAPSE allows an electric impulse to pass from the axon to the dendrite of one neuron to the other.
Answer is (c) Dendrite → cell body → axon → axonal end Explanation: Dendrites take up the stimulus, which are then transmitted to the cyton by the axon. The axonal ends, or terminal branches, are where the stimulus reaches a neuron and is transmitted to another neuron.
Ans : (a) Gustatory receptors detect taste while olfactory receptors detect smell . Explanation: A cell that has a receptor is one that can respond to external stimuli like light, taste, and smell.Example Photoreceptors pick up light. Taste is detected by gustatory receptors. Olfactory receptors pick up on the smell.
