Ncert Science Class 10 Solutions Chapter 6 Control and Coordination
Welcome to NCTB Solutions. Here with this post we are going to help 10th class students for the Solutions of NCERT Class 10 Science Book Chapter 6, Control and Coordination. Here students can easily find step by step solutions of all the questions in Control and Coordination. Also our Expert Science Teacher’s solved all the problems with easily understandable language with proper guidance so that all the students can understand easily. Here in this post students will get chapter 6 solutions. Here all Question Answer are based on NCERT latest syllabus.
Control and Coordination Exercise question Solutions :
(1) Which of the following is a plant hormone?
Correct option – (d) Cytokinin
Because, only Cytokinin is the plant hormone, other are animal hormone. Also, ascorbic acid is another name of vitamin C which is not a plant hormone.
(2) The gap between two neurons is called a
Correct option – (b) Synapse,
The gap between two neurons is synapse. Chemical crosses the gap and send signal to next dendrite of neurons.
(3) The brain is responsible for
Correct option – (d)
Because hind- brain (cerebellum) is responsible for thinking and balancing the body, also regulating the heart beat is controlled by brain. (mid Brain).
(4) What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
Function of receptors in our body :
Specialized tip of some nerve cell are called as receptors. This receptors receive signal from environment about change and send it to fore-brain. The brain interpreted this information and decide how to act on it on the basis of previous information stored in it.
• If Receptors don’t work properly we might take wrong actions decided by brain.
• If our nose is blocked by cold, we might realize change in taste of food.
(6) How does phototropism occur in plants?
Phototropism occur in plants like as follows –
Growth and movement in Plants respond to light, such movement and growth is called as phototropism. There is two type of phototropism in plant, shoot respond to bending towards light while roots respond to bending away from it (in Darkness).
Due to light the Auxin hormone is released, it is synthesized at the tip of the shoot and at the shady side of the shoot. Which triggers shoot to grow longer until light is reached. And that’s how bending towards light occur.
(7) Which signals will get disrupted in case of a spinal cord injury?
Nerves from all over the body meet at spinal cord, Which then transferred to brain. If spinal cord is injured then signal from all over body will not be transferred to brain and action on signal will not go to any part of body. Reflex arc is also present there may get damaged.
(8) How does chemical coordination occur in plants?
• In plants there is neither nervous system nor any muscles system. So to regulate and control growth and movement of plant, it release some chemical compound called hormones to act on the various parts of body.
• Different plant hormones help for different growth of plant body. They are secreted at one place and act on another area of action.
• Here are some examples, Auxin helps in phototropic growth, gibberellins helps growth of stem and cytokinins promote cell division. Abscisic acid inhibits growth.
(9) What is the need for a system of control and coordination in an organism?
The need for a system of control and coordination in an organism:
• There are multiple organisms in environment; organisms are of single cellular and multicellular. Multicellular organisms have organs for different life processes. The movement of organ must be controlled or it will disturb another process. Also movement is an attempt by living organisms to use changes in their environment to their advantage. Each kind of a change in the environment evokes an appropriate movement in response.
• Animal respond to environmental changes received by receptors and they have nervous and reflex system to decide action by brain or reflex on the basis of previous information stored in brain. ex. Animals and humans are get distant with fire. Plants don’t have different mechanism called chemical communication.
• Plants and animal also have chemical communication for control and coordination of changes and growth. It is also called hormones. Plants respond to light and tend to bend towards it. If seed buried in wet soil it starts to grow its root downwards.
(10) How are involuntary actions and reflex actions different from each other?
Difference between involuntary actions and reflex actions :
Involuntary Actions :
- These actions are controlled by mid-brain or medulla in the hind-brain.
- Vomiting, Blood pressure, Digestion, Salivation are examples of involuntary action.
- We do not need to think about involuntary actions, they are controlled unconsciously.
- Only internal muscles are in control.
Reflex Actions :
- These Actions Are controlled by spinal cord.
- Moving hand if touched to hot object, fast response while fighting.
- We do this consciously and they can be controlled. But information also sent to brain. Ex: lifting hot glass of tea.
- All external muscle or organ is controlled.
(11) Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Nervous mechanism :
- The receptors receive the information and pass to the nerve cell.
- The nerve cell send information forward with changing electric impulse into chemical and vice versa.
- Then it is transferred to the reflex mechanism of muscle and pass it to reflex arc in spinal cord. Brain also receives this information for integration and true thought process.
- Reflex arc or muscles reflex mechanism take action previously decided by brain.
- Animal have both nervous and hormonal mechanism for control and coordination of growth and movement.
- Its response and action time is fast.
Hormonal mechanism :
- The receptors receive information and pass to the particular gland.
- Gland releases chemical actuators, which is called hormones.
- Hormones are different for particular actions.
- Hormones releasing and acting places are different.
- Mostly plats only have the hormonal mechanism.
- Its response time is slow.
(12) What is the difference between the manner in which movement takes place in a sensitive plant and the movement in our legs?
Sensitive Plant :
- The movement in sensitive plant is due to stimulus action.
- It is involuntary action.
- Plant cell do not have special cell for movement, so it control the water flow.
- No special proteins for movement action is present.
Our legs :
- The movement is due to action by reflex mechanism or brain.
- It is voluntary action.
- Special cell for transfer of information to muscle and reflex mechanism(spinal cord to brain) is available.
- Protein for contraction of muscle is available.
More Solutions :
👉 Light – Reflection and Refraction
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