Control and Coordination

This is the correct option as abscisic acid is the hormone that inhibits the growth of a plant by promoting dormancy in seeds and buds.

This is the correct option. The plant hormone that is responsible for the phototropic and geotropic responses of a plant is auxin.

This is the correct option as cytokinins delay the aging of leaves and also promote the opening of stomata and food growth.

This is the correct option as this statement is false. Animals react to stimuli in many different ways because they have a nervous system and an endocrine system involving hormones.

This is the correct option as auxins are made and secreted by the meristematic tissue at the tip of the stem.

This is the correct option as only passion flowers and grapevine have stem tendrils. .

This is the correct option as ascorbic acid is not a plant hormone. Ascorbic acid is a naturally occurring organic compound with antioxidant properties.

This is the correct option as this statement is false. If the growth of a plant part is away from the stimulus, it is called negative tropism, and not positive tropism.

This is the correct option. Auxins are the plant hormones that promote cell enlargement and cell differentiation in plants. Gibberellins help in breaking dormancy in seeds and buds, and are also involved in shoot extensions. Abscisic acid promotes dormancy in seeds and buds as well as promotes the closing of stomata.

This is the correct option. Axon has an insulating and protective sheath of myelin (which is made of fat and protein) around it.

This is the correct option as neurons, also called as nerve cells, carry messages in the form of electrical signals called electrical impulses.

This is the correct option. Cerebrum is the main thinking part of the brain. 

This is the correct option. The brain is protected by a bony box in the skull called cranium.

This is the correct option as this statement is false. The reflexes which involve only the spinal cord are called as the spinal reflexes, not the cerebral reflexes.

This is the correct option as midbrain controls the reflex movements of the eye muscles, changes in pupil size and shapes of the eye lens.

This is the correct option as medulla is the controlling center for reflexes such as swallowing, coughing, sneezing, secretion of saliva and vomiting.

This is the correct option as all of the above are the characteristics of hormones.

This is the correct option. The cranial nerves connect all the parts in the head directly to the brain. The spinal nerves connect parts of the body like muscles, skin etc. to the spinal cord. The visceral nerves mostly connect the internal organs of the body to spinal cord, though some also connect to brain.

This is the correct option. Testes secrete testosterone.

This is the correct option. Sensory neurons transmit impulses from the receptors towards the central nervous system, i.e. towards the spinal cord and the brain. Motor neurons transmit impulses from the central nervous system, i.e. the spinal cord and the brain, towards the muscle cells. Relay neurons occur in the central nervous system, i.e. the brain and the spinal cord, where they serve as a link between other neurons.

This is the correct option. Ovaries act as endocrine glands and secrete the hormones oestrogen and progestrone. They act as exocrine glands and release eggs into the duct.

This is the correct option. The hypothalamus plays an important role in collecting information from other regions of the brain and from blood vessels passing through it. This information is passed on to the pituitary gland which by its own secretions, regulates the activities of all other endocrine glands.

This is the correct option. Thyroid gland is attached to the windpipe in the human body.

This is the correct option as adrenal glands are also called as the glands of emergency. In case of an emergency, these glands secrete large amounts of adrenaline, which further speeds up the heart beat and breathing, raising blood pressure and allowing more glucose to go into the body to give a lot of energy to the body.

This is the correct option. The pons take part in regulating respiration. The cerebellum helps in maintaining posture and balance of the body. The medulla controls various involuntary actions like heart beat, breathing, blood pressure and peristaltic movements of the alimentary canal.

This is the correct option. The spinal cord begins in continuation with medulla and extends downwards.

This is the correct option as pituitary gland does not occur in pair and is present just below the brain.

This is the correct option. Pituitary gland secretes human growth hormone. Parathyroid gland secretes parathormone. Ovaries secrete oestrogen and progestrone.

This is the correct option. The tendrils of plants that grow towards any support and wind around that support are positively thigmotropic.

This is the correct option as hydrogen oxide (water) acts as a stimulus in the process of hydrotropism.

This is the correct option. Geotropism is the movement of a plant part in response to gravity. Hydrotropism is the movement of a plant part in response to water. Thigmotropism is the movement of a plant part in response to the touch of an object.
This is a wrong option. Geotropism is the movement of a plant part in response to gravity. Thigmotropism is the movement of a plant part in response to the touch of an object. 

This is the correct option. Nastic movement is the movement of a plant part in response to an external stimulus in which the direction of response is not determined by the direction of stimulus. Thigmonasty is the non-directional movement of a plant part in response to the touch of an object. Photonasty is the non-directional movement of a plant part, usually petals, in response to light.

This is the correct option. Phonoreceptors are present in the inner ear to determine sound.

This is the correct option. Gustatory receptors are present in the tongue to detect taste.

This is the correct option.