Control and Coordination: Class 10 Science Q&A · Page 3
61 free answers on Control and Coordination (Science) for Class 10 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
- ScienceClass 10CBSE
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
Soln: The answer is (c) Dendrite → cell body → axon → axonal end Explanation: Stimulus is received by dendrites which are transmitted to cyton through the axon. Stimulus reaches the terminal branches called the axonal end, from where they are transmitted to another neuron.
- ScienceClass 10CBSE
1. Which of the following statements is correct about receptors? (a) Gustatory receptors detect taste, while olfactory receptors detect smell (b) Both gustatory and olfactory receptors detect smell (c) Auditory receptors detect smell, and olfactory receptors detect taste Olfactory receptors detect taste, and gustatory receptors smell
Soln: The answer is (a) Gustatory receptors detect taste, while olfactory receptors detect smell Explanation: A receptor is a cell which is sensitive for the external stimulus such as light, taste, and smell. For example, Photoreceptors detect light, Gustatory receptors detect taste, and Olfactory receptors detect smel
- ScienceClass 10CBSE
What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
Solution: Sl. no Movement in sensitive plants Movement in our legs 1 The movement in a sensitive plant is a response to stimulus (touch) which is an involuntary action. 1 Movement in our legs is a voluntary action.
- ScienceClass 10CBSE
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Solution: Nervous control Hormonal Control 1 It consists of nerve impulses between PNS, CNS and Brain. 1 It consists of the endocrine system which secretes hormones directly into blood. 2 Here response time
- ScienceClass 10CBSE
How are involuntary actions and reflex actions different from each other?
Solution: Reflex actions Involuntary actions 1. Rapid automatic responses to a stimulus without the conscious involvement of the brain 1. Occurs without the consciousness of an organism 2. Controlled by spinal cord 2. Controlled by mid brain or medulla oblongata</p
- ScienceClass 10CBSE
What is the need for a system of control and coordination in an organism?
Solution: There are various organs in an organism. These organs must be carefully controlled and coordinated for the survival of an organism. In the body of an organism, various fluids are secreted from the glands of the endocrine system. These hormones are responsible for the overall growth and development of an organism. All other daily decisions that include voluntary and involuntary actions are controlled by the central nervous system (CNS). Coordination i
- ScienceClass 10CBSE
Which signals will get disrupted in case of a spinal cord injury?
Solution: In case of a spinal cord injury, signals coming from the nerves, as well as the signals coming to the receptors, will be disrupted. Both these signals meet in a bundle in the spinal cord. Hence, both these signals get disrupted.
- ScienceClass 10CBSE
What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
Solution: Receptors are present throughout our body – mainly in sense organs. Receptors collect the information about changes that happen around us and send the signal/information to the brain which responds to the change detected. When receptors do not work properly, the environmental stimuli are not able to create nerve impulses and body does not respond.
- ScienceClass 10CBSE
The brain is responsible for (a) Thinking. (b) Regulating the heartbeat. (c) Balancing the body. (d) all of the above.
Solution: Answer is (d) all the above Brain is responsible for thinking, brain regulates the heartbeat, and it balance the body.
- ScienceClass 10CBSE
The gap between two neurons is called a (a) Dendrite. (b) Synapse. (c) Axon. (d) Impulse.
Solution: Answer is (b) Synapse Dendrite is a short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body. An axon or nerve fiber is a long, slender projection of a nerve cell or neuron in vertebrates that typically conducts electrical impulses known as action potentials away from the nerve cell body. The function of the axon is to transmit information to different neurons, muscl
- ScienceClass 10CBSE
. Which of the following is a plant hormone? (a) Insulin (b) Thyroxin (c) Oestrogen (d) Cytokinin
Solution: Answer is d) cytokinin. Cytokinin is a plant hormone whereas Insulin, Thyroxin, Oestrogen are the hormones produced by animals.
- ScienceClass 10CBSE
Why are some patients of diabetes treated by giving injections of insulin?
Solution: Diabetes is a condition where the pancreatic cells of a person stops producing or reduces the production of insulin hormone. Insulin regulates blood glucose by converting extra glucose to glycogen. When insulin is not produced adequately, a person’s blood glucose level is affected and this leads to adverse effects. In order to maintain the insulin and blood glucose levels, diabetes patients are treated with injections of insulin.
- ScienceClass 10CBSE
How does our body respond when adrenaline is secreted into the blood?
Solution: Adrenaline is a hormone secreted when a person is frightened or mentally disturbed. When Adrenaline reaches the heart, heartbeat will increase to increase blood supply to our muscles. Adrenaline also increases the breathing rate because of contraction of diaphragm and the rib muscles. Adrenaline rush also increases blood pressure and allows entry of more glucose into blood. All these occur when our body responds to the secretion of adrenaline into our blood.
- ScienceClass 10CBSE
Why is the use of iodized salt advisable?
Solution: Usage of iodized salt is advisable to avoid the deficiency of iodine. If the intake of iodine is low, the release of thyroxine from the thyroid gland will be decreased. This affects fat, carbohydrate and protein metabolism. Thus, a person may have goitre if the intake of iodine is lowered.
- ScienceClass 10CBSE
How do auxins promote the growth of a tendril around a support?
Solution: Auxins are the plant hormones produced at the tips of shoots and roots. Auxins are present at the tip of tendrils. When tendrils are attached around any support, their growth is slowed down as auxins are sensitive to touch. This makes them move to the other side of the tip to get support; this makes the other side grow faster than the side of tendril in contact with the support and the tendril bends towards the support.
- ScienceClass 10CBSE
Give an example of a plant hormone that promotes growth.
Solution: Auxins and Gibberlins are the hormone responsible for the growth of plant. Auxins are responsible for the cell elongation in shoot and also regulate growth. Gibberlin is responsible for stem elongation and germination.
- ScienceClass 10CBSE
How is the movement of leaves of a sensitive plant different from the movement of a shoot towards light?
Solution: Sl. no Movement of leaves of a sensitive plant Movement of a shoot towards light 1 It does not depend on the direction of stimulus applied. Depends on the direction of stimulus applied. 2 Nastic m
- ScienceClass 10CBSE
How do we detect the smell of an agarbatti (incense stick)?
Solution: The smell of an agarbatti is detected by the nose. The olfactory receptors present in the nose sends electrical signal to the fore brain. The fore brain interprets this signal as the smell of the incense stick.
- ScienceClass 10CBSE
Which part of the brain maintains the posture and equilibrium of the body?
Solution: Cerebellum, which is a part of the brain, is responsible for controlling the motor functioning. Hence, it is the part engaged in the maintenance of posture and equilibrium of the body.
- ScienceClass 10All
What tissues make up the brain and spinal cord?
The brain and spinal cord are primarily composed of nervous tissue (also called neural tissue). This specialized tissue consists of two main cell types: neurons (nerve cells) that transmit electrical signals, and neuroglia (supporting cells) that provide structural support, insulation, and nutrition. Nervous tissue in the central nervous system is organized into gray matter (cell bodies) and white matter (myelinated nerve fibers). This complex tissue enables processing, integ