exam preperation

Question 1

what is nervous system?

Answer 1

It is they system which receives stimulus and sends it to other parts of the body by means of impulses with their corresponding result.

Question 2

What is spinal arc

Answer 2

Spinal arc is the route taken by impulses from receptors to effectors during involuntary action

Question 3

WHAT IS CEREBROSPINAL FLUID?

Answer 3

CEREBROSPINAL FLUID IS THE FLUID THAT PROTECTS BRAIN AND SPINAL CORD FORM SUDDEN JERKS.

Question 4

role of kidney in excretory system

Answer 4

kidney filtrates bloods and excrete the unnecessary substance in form of urine

Question 5

Function of collenchyma

Answer 5

1.It supports plasticity and elasticity
2. It consists of chlorophyll which help in photosynthesis.
3. It reduces the tearing effect of wind on the leaves.

Question 6

function of phloem

Answer 6

To transport food from leaves to the different part of the plants.

Question 7

What is ganglia

Answer 7

Ganglia are the nervous tissues outside the central nervous system.

Question 8

Which hormone is responsible for the balance of calcium level in bone

Answer 8

Parathormone is responsible for balance of calcium in bone

Question 9

which hormone is responsible for the maintenance of sugar in blood

Answer 9

Insulin is responsible for the maintenance of sugar in the blood

Question 10

function of parasympathetic autonomous nervous system

Answer 10

To maintain the blood pressure and heart beat after the emergency is over

Question 11

hypo and hyper secretion of parathormone

Answer 11

hyposecretion- Tetany
hypersecretion- formation of stones in kidney and tumor

Question 12

what is ecosystem?

Answer 12

Ecosystem is the ecological unit which consists of both biotic and abiotic components of the enviroment

Question 13

Define decomposer

Answer 13

Decomposers are the organisms tha break down complex organic matters into simpler substance.

Question 14

What is food web?

Answer 14

Food web is a network of food chains interconnected at different trophic levels.

Question 15

example of symbiosis

Answer 15

1. Bee and flower.
2. Lichens: algae and fungus

Question 16

what is force?

Answer 16

Force is a pull or push that changes or tends to change the position of the body from motion to rest or rest to motion

Question 17

State newton’s first law of motion

Answer 17

Newton first law of motion states that “Everybody continuous to be in the state of rest or motion in a straight line unless an external force is applied on it

Question 18

What is retardation?

Answer 18

It is defined as decrement in velocity per unit time. Negative acceleration is called retardation

Question 19

state newton’s second law of motion

Answer 19

Newton second law stats that “Acceleration of a body is directly proportional to the force applied and inversely proportional to the mass of the body”

Question 20

State newton’s third law of motion

Answer 20

Newton’s third law of motion states that “Every action has equal but negative reaction”

Question 21

Define balanced force

Answer 21

When number of forces acting on a body doesnot change the position of the body then the body is said to have balanced force. The applied force and opposing force is equal in balanced force.

Question 22

Define inertia of rest

Answer 22

It is the property of a body by virtue of which it remains or tends to remain in the state of rest unless an external force is applied on it.

Question 23

Define inertia of motion

Answer 23

It is the property of a body by virtue of which it remains or tends to remains in the state of motion in a straight line unless an external force is applied on it

Question 24

Define elasticity

Answer 24

It is the property of a solid by virtue of which it changes back to its form after the removal of external force

Question 25

Define plasticity

Answer 25

It is the property of body by virtue of which it remains its deformed shape even after the removal of external force.

Question 26

What is motion? Give example

Answer 26

Motion is the state of body in which it is changing position with respect to a reference point.
for example : Lets take a tree as a reference point and car as a object, the car is said to be in motion if it changes it’s position with respect to the tree.

Question 27

difference between action and reaction

Answer 27

action.
1. It is the process of taking or performing steps to get a desired outcome.
2. It can be initiated at any time by the actor.
eg : cooking, driving

reaction
1. It is the result or outcome of an actin
2. It only occurs after an action.
eg : braking the car in the response of traffic light.