Question

answer this question

Answer 1

what is difference between the manner in which movement in the sensitive plany and movement in our legss takes places

Answer:-

Movements in sensitive plants

1. The movement is response to stimulus (involuntary action).

2. Plant cells do not have specialised protein for movements.

Movement in legs

1. It is a voluntary action.

2. Animal cells have specialised protein which help muscles to contract.

Answer 2

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Q.1

Answer : The receptors in our body collect information about changes in the environment around us in the form of stimuli. They are located in our sense organs such as the inner ear, eyes, nose, tongue, etc. These then passes the information in the form of interpreted and instructions are sent to effectors which reveal responses.

When receptors do not work properly, the environmental stimuli are not able to create nerve impulses and body not responses.

Q.2

Answer : A neuron consists of three parts :-

☢Cell Body :

It is a typical animal cell which contains cytoplasm and Nucleus.

☢Dendrites :

A number of long and thin fibers comes out from the cell body of the neurons, they are nerve fibre. The shorter fibers on the cell body of neuron are called dendrites.

☢Axon :

The longest fiber on the body of neurons is called axon. It has and insulating and protective sheath of myclin around it.

☢Functions :

The information, accquired at the end of the dendritic tip of a nerve cell, sets off a Chemical reaction that creates an electrical impulse.

This impulse travels from the dendrites to the cell body, and then along the axon to its end. At the end of the axon, the electrical impulse sets off the release of some chemicals. This chemicals cross the gap, or synaps, and a similar electrical impulses in a dendrites of the next neuron. This is a general scheme of how nervous impulses travel in the body. A similar synapse finally allows delivery of such impulses from neurons to other cells, such as muscles cell or gland. It is thus no surprise that nervous tissue is made up of an organised network of nerve cells, and is specialised for conducting information via electrical impulses from one part of the body to another.

Q.3

Answer : Movement of shoot towards light is called phototropism. This movement is caused due to more growth of cells towards the shaded side of the shoot as compared to the side of shoot towards light. More growth of cells is due to secretion of auxin towards the shaded side let's see an activity :-

☢Fill a conical flask with water.

☢Cover the neck of the flask with a wire mesh.

☢Keep two or three freshly germinated bean seeds on the wire mesh.

☢Take a cardboard box which is open from one side.

☢Keep the flask in the box in such a manner that the open side of the box faces the light coming from a window.

☢After two or three days, you will notice that the shoot bends towards light and roots away from light.

☢Now, turn the flask so that the shoots are away from the light and the roots towards light. Leave it undisturbed in this condition for a few days.

☢The old parts of the roots and shoot change directions.

☢New growth in shoots is in direction of sunlight.

Conclusion : Shoots shows phototropism.

Q.4

Answer : ☢Reflex action

☢Impulses from various body part will not be conducted to brain.

☢Message from brain will not be conducted to various organs of body.

Q.5

Answer : Plant do not have nervous system but still sense the things because of stimulus such as gravity, light, Chemicals, water, touch. Harmones are responsible for the Chemical coordination of plants by intergating their behaviour by affecting growth of a plant resulting in movement of that plant part is response to a stimulus. When sunlight falls on the shoot from one side, the auxins hormones causes. the shady side of the shoot to grow faster, making the shoot to grow faster, making the bend towards sunlight.

Q.6

Answer : Involuntary actions are not controlled by us they are independent process means there is no stimulus involved in these actions but reflex action is also involuntary in nature but they involves stimulus means functions or respond according to it.

Example :-

☢Involuntary actions : Heat beal, breathing process; etc.

☢Reflex action : Sleeping out in bright light, changes in size of pupil of eye.

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