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NCERT Exemplar Solution for CBSE Class 10 Science Chapter 7: Control and Coordination (Part-II)

May 23, 2017 15:54 IST

    Class 10 NCERT Exemplar, Control and Coordination NCERT Exemplar ProblemsHere you get the CBSE Class 10 Science chapter 7, Control and Coordination: NCERT Exemplar Problems and Solutions (Part-I). This part of the chapter includes solutions for Question No.34 to 44 from the NCERT Exemplar Problems for Class 10 Science Chapter: Control and Coordination. These questions include only the Short Answer Type Questions framed from various important topics in the chapter.

    NCERT Exemplar Solution for CBSE Class 10 Science Chapter 7: Control and Coordination (Part-I)

    NCERT Exemplar problems are a very good resource for preparing the critical questions like Higher Order Thinking Skill (HOTS) questions. All these questions are very important to prepare for CBSE Class 10 Science Board Examination 2017-2018 as well as other competitive exams.

    Find below the NCERT Exemplar problems and their solutions for Class 10 Science Chapter, Control and Coordination:

    Short Answer Type Questions

    Questions. 34 Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in given figure.

    Components of Reflex Arc

    Answer.

    (a) Sensory neuron

    (b) Spinal cord (CNS)

    (c) Motor neuron

    (d) Effector (muscle in arm)

    Direction of flow of electric signal is as shown below:

    Sensory receptor → sensory neuron →  spinal cord (CNS) → motor neuron → effector organ

    flow of electrical signal in reflex arc

    Questions. 35 Name the plant hormones responsible for the following:

    (a) Elongation of cells

    (b) Growth of stem

    (c) Promotion of cell division

    (d) Falling of senescent leaves

    Answer. 

    (a) Elongation of cells: Auxin

    (b) Growth of stem: Gibberellin

    (c) Promotion of cell division: Cytokinin

    (d) Falling of senescent leaves: Abscisic acid

    CBSE Class 10 Science Syllabus 2017-2018

    Questions. 36 Label the endocrine gland in figure:

    Endocrine glands Representation

    Answer. 

    (a) Pineal gland

    (b) Pituitary gland

    (c) Thyroid gland

    (d) Thymus gland

    Questions. 37 In figure (a), (b) and (c), which appears more accurate and why?

    Tropic Movement in Plants

    Answer.

    Figure (a) is more accurate. Roots of plants are positive geotropic and grow downwards while stem is positive phototropic and grows upward.

    Questions. 38 Label the part of a neuron in figure given below.

    Labelled diagram of neuron

    Answer.  

    (a) Dendrite

    (b) Cell body

    (c) Axon

    (d) Nerve ending

    Questions. 39 Match the terms of Column (A) with those of Column (B)

    Column (A)

    Column (B)

    (a) Olfactory receptors

    (i) Tongue

    (b) Thermo receptors (temperature receptors)

    (ii) Eye

    (c) Gustatoreceptors

    (iii) Nose

    (d) Photoreceptors

    (iv) Skin

    Answer.

    The matching of the column (A) with column (B) is:

    Column (A)

    Column (B)

    (a) Olfactory receptors

    (iii) Nose

    (b) Thermo receptors (temperature receptors)

    (iv) Skin

    (c) Gustatoreceptors

    (i) Tongue

    (d) Photoreceptors

    (ii) Eye

    Questions. 40 What is a tropic movement? Explain with an example.

    Answer.

    The directional growth movements of plants due to an external stimuli are called tropic movements. It can be either towards the stimulus, or away from it.

    Growth of plant in response to light is known as phototropism. For example, shoots and stem of the plant grow upwards hence show positive phototropism.

    Growth of of plant in direction of gravity is known as geotropism. For example, roots of plants are grow downwards hence show positive geotropism.

    NCERT Solutions for CBSE Class 10 Science

    Questions. 41 What will happen if intake of iodine in our diet is low?

    Answer.

    Thyroid gland produces thyroxine and triiodothyronine. Thyroxine has four iodine atoms, while triiodothyronine has three iodine atoms. The dietary iodine serves as source and thus iodine deficient diet renders the gland unable to synthesize the hormones. Thyroid hormones deficiency inhibits metabolic rate, growth and development.

    A person might suffer from goitre in case of iodine deficiency in the body.

    Questions. 42 What happens at the synapse between two neurons?

    Answer.

    Synapse is the junction between two neurons. Electrical impulse at the axonal end stimulates the axon bulb to release chemical (neurotransmitter) which in turn diffuses across the synapse. The chemical serves to stimulate the dendrites of adjacent neuron which in turn send electrical signals to their cell body to be carried along the axon.

    Questions. 43 Answer the following:

    (a) Which hormone is responsible for the changes noticed in females at puberty?

    (b) Dwarfism results due to deficiency of which hormone?

    (c) Blood sugar level rises due to deficiency of which hormone?

    (d) Iodine is necessary for the synthesis of which hormone?

    Answer.

    (a) Oestrogen is responsible for development of secondary sexual characters in females at puberty.

    (b) Growth hormone promotes growth and development of the body.

    (c) Insulin controls blood sugar level by stimulating oxidation of glucose and absorption of glucose by liver and muscle cells.

    (d) Iodine is necessary for the synthesis of thyroxine. It is a thyroid hormone that regulates the metabolism in the body.

    Questions. 44 Answer the following:

    (a) Name the endocrine gland associated with brain?

    (b) Which gland secretes digestive enzymes as well as hormones?

    (c) Name the endocrine gland associated with kidneys?

    (d) Which endocrine gland is present in males but not in females?

    Answer.  

    (a) Pituitary gland located in the groove of sphenoid bone of the skull in the brain.

    (b) Pancreas secretes the pancreatic juice and hormones insulin and glucagon.

    (c) Adrenal glands are located on the top of two kidneys.

    (d) Testes are present only in males which secrete male sex hormone, testosterone.

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