Control and Coordination Practice Worksheet for Class 10 Biology
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a. Multiple Choice Questions
b. Very Short Answer Questions
c. Short Answer type
d. Long answer questions
Match the column
p -> iv
q -> i
r -> ii
s -> iii
Very Short Answer type
Name the plant hormone which is used as weedicide. Answer
Name the two mechanisms which control and coordinate the activities of the different parts of the body. Answer
Nervous system and endocrine system
Write the full form of :
(b) CNS Answer
PNS: Peripheral Nervous System
CNS:central nervous system
Where can we find Nissles granules? Answer
cyton or cell body of the neurons.
Mention the part of the brain which controls the involuntary actions like blood pressure, salivation etc. Answer
medulla in the hindbrain
While watering a rose plant, a thorn pricked Rita’s hand. How would she respond to this situation?
Name the part of a plant that exhibits positive phothtropism. Answer
Stem and leaves
Define ‘chemotropism’. Answer
Chemotropism is the movement of plant in response to the chemicals e.g., movement of pollen tube towards ovule in response to the sugary molecule.
How is the spinal cord protected in the human body? Answer
The spinal cord is protected by the vertebral column.
What are the units of nervous system? Answer
The units of nervous system are specialized cells called the neurons.
What is an impulse? Answer
An impulse is an electrical disturbance.
What are the two potentials that are generated while transmission of an impulse? Answer
The two potentials are resting potential a
We suddenly withdraw our hand when a pin pricks. Name the type of response involved in this action. Answer
What are nerve fibres? Answer
The long axons of neurons along with the associated structures are called the nerve fibres.
What are nodes of Ranvier? Answer
The nerve fibres may be enclosed within sheaths called ad myelin sheath. Along the fibres there are regions where the myelin sheath is absent. These regions are called the nodes of Ranvier.
Name the system in animals which help in the process of control and coordination. Answer
(i) Nervous system
(ii) Hormonal (Endocrine) system
Name the largest cell in the human body. Answer
Nerve cell or neuron.
Have the old parts of the shoot and root changed direction? Answer
The old parts of roots and shoots of plant change their directions slightly (very less), while new parts move more.
What are the main divisions of nervous system? Answer The nervous system is broadly divisible into two parts:
(i) Central nervous system,
(ii) Peripheral nervous system
Short Answer type
Why tropic movement are mostly irreversible? Answer
Tropic movements are directional growth movements in plants that occur in response to external stimuli such as light, gravity, touch, etc. These movements enable the plant to grow towards or away from the stimulus. Why Tropic Movements are Mostly Irreversible
(a)Permanent Growth Changes: Tropic movements involve permanent changes in the growth of plant cells. For example, in phototropism, the cells on the side of the stem away from the light source elongate more, causing the stem to bend towards the light. Once these cells have elongated, they cannot return to their original size.
(b)Cell Wall Modifications: The plant cell wall is rigid and maintains the shape of the cell. During tropic movements, the cell wall undergoes modifications that allow for elongation or contraction of cells. These changes are permanent and cannot be reversed.
(c)Hormonal Influence: Plant hormones such as auxins play a crucial role in tropic movements. They promote or inhibit growth in specific regions of the plant, leading to bending or orientation towards the stimulus. Once the hormones have acted on the cells, the effects are generally irreversible.
(d)Adaptation to Environmental Conditions: Tropic movements are adaptive responses to environmental conditions. They enable the plant to maximize exposure to essential factors like sunlight or nutrients. Reversing these movements would be counterproductive to the plant's survival and growth.
How auxin helps in Phototropism. Answer
Auxin plays a vital role in phototropism by redistributing itself in response to light, promoting cell elongation on the shaded side of the plant, and causing the plant to bend towards the light source. This mechanism allows plants to adapt to their environment and maximize their exposure to sunlight, which is essential for growth and energy production through photosynthesis. Question 3
What is significance of unidirectional light in experiment of Phototropism. Question 4
Why response of plants is slower than animals?
How we can make plant more bushy?
Why is abscisic acid known as stress hormone?
If one fruit is ripened and if it is kept in a basket of raw fruits, then what will happen? What is the cause of it?
Name the hormones responsible for the:
(i) Phototropic movement of plant
(ii) Promoting cell division in plants Answer
Define 'nerve impluse'. Which structure in a neuron helps to conduct a nerve impulse.
(i)towards the cell body
(ii)away from the cell body?
Name the various endocrine glands? Answer
The various endocrine glands are pituitary, pineal, thyroid, parathyroid, thymus, pancreas, adrenal and the gonads (ovaries and tastes).
What is TSH? Where is it produced? Answer
TSH is thyroid stimulating hormone that stimulates thyroid to produce thyroxine. It is produced by the anterior lobe of the pituitary.
What is Synapse. Name chemical that helps in transmission across synapse Answer
(i)The junction between the axon and the dendrites of the next neuron is called the synapse.
How do muscles respond to the nerve impulse? Answer
Muscles play a vital role in movement and other physical functions in organisms.
A nerve impulse is an electrical signal that travels along a nerve cell or neuron. It is generated in response to a stimulus and carries information from one part of the body to another.
The nerve impulse travels along a motor neuron to a specialized junction called the neuromuscular junction.The neuromuscular junction is the name of the place where the motor neuron reaches a muscle cell.
When the impulse reaches the neuromuscular junction, it triggers the release of a neurotransmitter called acetylcholine.Acetylcholine binds to specific receptors on the muscle cell membrane and that start a chemical reaction in the muscle
Give four examples of simple human reflexes. Answer
(i) Knee – jerk reflex in which the leg is involuntarily extended forward as a result of a sharp tap below the knee – ap in a relaxed (freely hanging) leg.
(ii) Closing of the eyelids when an object suddenly approaches the eye or when a strong beam of light is flashed cross.
(iii) Withdrawal of the hand on pricking a pin or a horn.
(iv) Movement of the diaphragm.
Design an experiment to demonstrate hydrotropism. Answer
Positive hydrotropism can be demonstrated with terminated seedlings, which are allowed to grow on ground. The soil below the roots is separated by a polythene partition. The left side is kept moist but the right side is kept ry.
The radicals at first grow in a downward direction due to the effect of gravity (positive geotropism), but after some time, the roots bend toward the moist soil (positive hydrotropism). This is evidently due to the closeness of the germinating roots to wate
Long Answer type
How do muscle cells move?
Mention any two signals which will get disrupted in case of spinal injury.
What are reflex actions? Give two examples. Explain a reflex arc.
(a)What happens at the synapse between two neurons?
(b) How is brain protected?
Draw a flow diagram of reflex are illustrating the sequence of events which occur when we withdraw our hand on being pricked by a pin.
Name the hormone secreted by (a) pancreas (b) pituitary (c) thyroid. Write one function of each of the hormone. Answer
In a neuron:
(i) Where does information received?
(ii) Through what information travels as an impulse?
(iii) Where does the impulse get converted into a chemical signal for outward transmission?
Expand the following terms:
(v) IBA Answer
GA : Gibberellic Acid
2,4-D : 2,4-Dichlorophenoxyacetic acid
ABA : Abscisic Acid
IAA : Indole-3-acetic Acid
Differentiate between tropic and nastic movements in plants.
(a) Name the system which communicates between the central nervous system and the other parts of the body. What does it consist of?
(b) Mention three components of hind brain and write one function of each.
With the help of suitable example explain the terms phototropism, geotropism and chemotropism.
Plants do not have nervous system like animals. In the absence of nervous system, how does control and coordination activities.
How do plants respond to external stimuli?
In the absence of muscle cells, how do plant cells show movement?
State two different types of movement in plants. Mention two points of difference between them.
(a)Define hormones. Write four characteristics of hormones in humans.
(b) Name the disorder caused by the following situations:
(i)Under secretion of growth hormone
(ii) Over secretion of growth hormone
(iii) Under secretion of insulin
(iv) Deficiency of iodine Answer
(a) Hormones can be defined as secretions that are poured into blood in order to reach a specific target organ.
Hormones have the following characteristics:
(iv)Goitre Question 17.
When a person is scared, name the hormone which is directly secreted into the blood. Mention the gland which secretes this hormone.
Explain the need of chemical communication in multicellular organisms.
What are the functions of spinal cord? Answer
The functions of the spinal cord are:
(i)What is a reflex?
(ii)What are the two main types of reflexes? Give one example for each. Answer
(i)When the stimulation of a receptor results in a spontaneous, involuntary reaction, it is called reflex action or simply reflex.
(ii)The two main types of reflexes are:
This Class 10 Science Control and Coordination Practice Worksheet with answers is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.
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