Answer: The spinal nerves go to the organs which are below the head region. Moreover, the autonomous nervous system is also connected to the spinal cord. In case of spinal cord injury, communication between the spinal nerves and the brain would be disturbed. Similarly, the communication between the autonomous nervous system and brain would also be disturbed; in case of spinal cord injury.
Answer: Receptors provide information about the external environment so that the brain can instruct a related to organ to take necessary action. Receptors play an important role in our survival. Let us take the example of a person with hearing impairment. Certain ordinary task would be very difficult for that person. For example; while walking on the road, the person needs to hear the sound of vehicles moving near him. Without hearing those sounds, he would not be in a position to move safely on the road.
Which of the following is a plant hormone? Insulin Thyroxin Oestrogen Cytokinin
Answer: (d) Ctyokinin
The gap between two neurons is called a Dendrite Synapse Axon Impulse
Answer: (b) Synapse
The brain is responsible for Thinking Regulating the heart beat Balancing the body All of the above
Answer: (d) All of the above
Draw the structure of a neuron and explain its function.
Answer: Function of Neuron: Neuron transmits the nerve impulses.
How does phototropism occur in plants?
Answer: Concentration of auxin changes in a particular plant part, in response to the direction of light. For example; in a stem, concentration of auxin increases in those parts which are away from light. This increases cell division in that part and thus the stem bends towards light. That is how phototropism occurs in plants.How does chemical coordination occur in plants?
Answer: Plant hormones play their roles in chemical coordination. Most of the plant hormones promote growth in certain plant parts, e.g. auxin, gibberellins and cytokinin. Abscissic acid is a plant hormone which inhibits growth. Shedding of leaves or ripe fruits is facilitated by abscissic acid.What is the need for a system of control and coordination in an organism?
Answer: A living being does not live in isolation. It has to constantly interact with its external environment and has to respond properly for its survival. For example; when a hungry lion spots a deer, the lion has to quickly make a move so that it can have its food. On the other hand, the deer needs to quickly make a move to run for its life.How are involuntary actions and reflex actions different from each other?
Answer: Involuntary actions are part of routine activities, while reflex actions are in response to a sudden danger. Moreover, involuntary actions happen in involuntary organs, while reflex action happens in a voluntary organ.Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Answer: Nervous control is fast, while hormonal control is slow. Nervous control is facilitated by neurotransmitters, while hormonal control is facilitated by hormones.What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
Answer: The movement in a sensitive plant is facilitated by chemical control, while the movement in our legs is facilitated by nervous control.Which of the following statements is correct about receptors? Gustatory receptors detect taste while olfactory receptors detect smell Both gustatory and olfactory receptors detect smell Auditory receptors detect smell and olfactory receptors detect taste Olfactory receptors detect taste and gustatory receptors smell
Answer: (a) Gustatory receptors detect taste while olfactory receptors detect smell
Electrical impulse travels in a neuron from Dendrite ⇨ axon ⇨ axonal end ⇨ cell body Cell body ⇨ dendrite ⇨ axon ⇨ axonal end Dendrite ⇨ cell body ⇨ axon ⇨ axonal end Axonal end ⇨ axon ⇨ cell body ⇨ dendrite
Answer: (c) Dendrite ⇨ Cell body ⇨ Axon ⇨ Axonal end
In a synapse, chemical signal is transmitted from Dendritic end of one neuron to axonal end of another neuron Axon to cell body of the same neuron Cell body to axonal end of the same neuron Axonal end of one neuron to dendritic end of another neuron
Answer: (d) Axonal end of one neuron to dendritic end of another neuron
In a neuron, conversion of electrical signal to a chemical signal occurs at/in Cell body Axonal end Dendritic end Axon
Answer: (b) Axonal end
Which is the correct sequence of the components of a reflex arc? Receptors ⇨ Muscles ⇨ Sensory neuron ⇨ Motor neuron ⇨ Spinal cord Receptors ⇨ Motor neuron ⇨ Spinal cord ⇨ Sensory neuron ⇨ Muscle Receptors ⇨ Spinal cord ⇨ Sensory neuron ⇨ Motor neuron ⇨ Muscle Receptors ⇨ Sensory neuron ⇨ Spinal cord ⇨ Motor neuron ⇨ Muscle
Answer: (d) Receptors ⇨ Sensory neuron ⇨ Spinal cord ⇨ Motor neuron ⇨ Muscle
Which of the following statements are true? Sudden action in response to something in the environment is called reflex action Sensory neurons carry signals from spinal cord to muscles Motor neurons carry signals from receptors to spinal cord The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc
(i) and (ii) (i) and (iii) (i) and (iv) (i), (ii) and (iii)
Answer: (c) (i) and (iv)
Which of the following statements are true about the brain? The main thinking part of brain is hind brain Centres of hearing, smell, memory, sight, etc. are located in forebrain. Involuntary actions like salivation, vomiting, blood pressure are controlled by the medulla in the hind brain Cerebellum does not control posture and balance of the body
(i) and (ii) (i), (ii) and (iii) (ii) and (iii) (iii) and (iv)
Answer: (c) (ii) and (iii)
Posture and balance of the body is controlled by Cerebrum Cerebellum Medulla Pons
Answer: (b) Cerebellum
Spinal cord originates from Cerebrum Medulla Pons Cerebellum
Answer: (b) Medulla
The movement of shoot towards light is Geotropism Hydrotropism Chemotropism Phototropism
Answer: (d) PhototropismThe main function of abscissic acid in plants is to Increase the length of cells Promote cell division Inhibit growth Promote growth of stem
Answer: (c) Inhibit growth
The growth of tendril in pea plants is due to Effect of light Effect of gravity Rapid cell divisions in tendrillar cells that are away from the support Rapid cell divisions in tendrillar cells in contact with the support
Answer: (c) Rapid cell divisions in tendrillar cells that are away from the support
The growth of pollen tubes towards ovules is due to Hydrotropism Chemotropism Geotropism Phototropism
Answer: (b) Chemotropism
The movement of sunflower in accordance with the path of sun is due to Phototropism Geotropism Chemotropism Hydrotropism
Answer: (a) Phototropism
The substance that triggers the fall of mature leaves and fruits from plants is due to Auxin Gibberellin Abscissic acid Cytokinin
Answer: (c) Abscissic acid
Which of the following is not associated with growth of plant? Auxin Gibberellins Cytokinins Abscissic acid
Answer: (d) Abscissic acid
Iodine is necessary for the synthesis of which hormone? Adrenaline Thyroxin Auxin Insulin
Answer: (b) Thyroxine
Choose the incorrect statement about insulin It is produced from pancreas It regulates growth and development of the body It regulates blood sugar level Insufficient secretion of insulin will cause diabetes
Answer: (b) It regulates growth and development of the body
Select the mis-matched pair Adrenaline: Pituitary gland Testosterone: Testes Estrogen: Ovary Thyroxin: Thyroid gland
Answer: (a) Adrenaline: Pituitary gland
The shape of guard cells changes due to change in the Protein composition of cells Temperature of cells Amount of water in cells Position of nucleus in the cells
Answer: (c) Amount of water in cellsNerve impulse travels from dendritic end towards axonal end At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells
Answer: (c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron
Involuntary actions in the body are controlled by Medulla in forebrain Medulla in midbrain Medulla in hindbrain Medulla in spinal cord
Answer: (c) Medulla in the hindbrain
Which of the following is not an involuntary action? Vomiting Salivation Heart beat Chewing
Answer: (d) Chewing
When a person is suffering from severe cold, he or she cannot Differentiate the taste of an apple from that of an ice cream Differentiate the smell of a perfume from that of an agarbatti Differentiate red light from green light Differentiate a hot object from a cold object
Answer: (b) Differentiate the smell of a perfume from that of an agarbatti
What is the correct direction of flow of electrical impulses? Which statement is not true about thyroxin? Iron is essential for the synthesis of thyroxin It regulates carbohydrates, protein and fat metabolism in the body Thyroid gland requires iodine to synthesise thyroxin Thyroxin is also called thyroid hormone
Answer: (a) Iron is essential for the synthesis of thyroxine
Dwarfism results due to Excess secretion of thyroxin Less secretion of growth hormone Less secretion of adrenaline Excess secretion of growth hormone
Answer: (b) Less secretion of growth hormone
Dramatic changes of body features associated with puberty are mainly because of secretion of Oestrogen from testes and testosterone from ovary Oestrogen from adrenal gland and testosterone from pituitary gland Testosterone from testes and Oestrogen from ovary Testosterone from thyroid gland and Oestrogen from pituitary gland
Answer: Testosterone from testes and Oestrogen from ovary
A doctor advised a person to take an injection of insulin because His blood pressure was low His heart was beating slowly He was suffering from goiter His sugar level in blood was high
Answer: (d) His sugar level in blood was high
The hormone which increases the fertility in males is called Oestrogen Testosterone Insulin Growth hormone
Answer: (b) Testosterone
Which of the following endocrine glands is unpaired? Adrenal Testes Pituitary Ovary
Answer: (c) Pituitary
Junction between two neurons is called Cell junction Neuro muscular junction Neural joint Synapse
Answer: (d) Synapse
In humans, the life processes are controlled and regulated by Reproductive and endocrine systems Respiratory and nervous systems Endocrine and digestive systems Nervous and endocrine systems
Answer: (d) Nervous and endocrine systems
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