The power of accommodation is the ability of the eye to focus on distant as well as nearby objects by changing the focal length of lens.This focal length of eyes is changed with the help of ciliary muscles.
The power of accommodation is the ability of the eye to focus on distant as well as nearby objects by changing the focal length of lens.This focal length of eyes is changed with the help of ciliary muscles.
Natural gas can be used for heating and cooking food because it is a clean source of energy. It does not produce huge amount of smoke on burning. Although it is highly inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning.
Natural gas can be used for heating and cooking food because it is a clean source of energy. It does not produce huge amount of smoke on burning. Although it is highly inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning.
A good fuel should have the following characteristics. It should be easily available. It should be cheap. It should have a high calorific value. It should have a low ignition point, which is not lower than room temperature (so that it does not catch fire at room temperature). It should not burn tooRead more
A good fuel should have the following characteristics.
It should be easily available.
It should be cheap.
It should have a high calorific value.
It should have a low ignition point, which is not lower than room temperature (so that it does not catch fire at room temperature).
It should not burn too fast or too slowly.
A good source of energy fulfils the following criteria: It produces a lot of heat per unit mass. It does a huge amount of work per unit mass. It is easily accessible. It is easy to store and transport. It is economical. It produces less amount of smoke.
A good source of energy fulfils the following criteria:
It produces a lot of heat per unit mass.
It does a huge amount of work per unit mass.
It is easily accessible.
It is easy to store and transport.
It is economical.
It produces less amount of smoke.
Decomposers break down complex organic substances into simpler substances.Since decomposers help in decomposing dead plants and animals, they act as cleansing agents of the environment.Also, the decomposers recycle nutrients from dead plants and animals, and their waste back to the ecosystem. WithouRead more
Decomposers break down complex organic substances into simpler substances.Since decomposers help in decomposing dead plants and animals, they act as cleansing agents of the environment.Also, the decomposers recycle nutrients from dead plants and animals, and their waste back to the ecosystem.
Without decomposers, there would be a lot of dead plants and animals. Hence, the soil would lack nutrients plants need to grow and the entire ecosystem would break down.
The various steps in a food chain at which the transfer of food/energy takes place are called trophic levels.In a food chain, each step representing an organism forms a trophic level. For example, Grass--> Grasshopper--> Frog--> Snake In the above food chain Grasshopper eats grass, frog eatRead more
The various steps in a food chain at which the transfer of food/energy takes place are called trophic levels.In a food chain, each step representing an organism forms a trophic level.
For example,
Grass–> Grasshopper–> Frog–> Snake
In the above food chain Grasshopper eats grass, frog eats the grasshopper and snake eats the frog. Thus, Plants are the producers, and represents the first trophic level. Grasshoppers are the primary consumers, and represent the second trophic level. Frogs are the secondary consumers, and represent the third trophic level. Snakes are the tertiary consumers and represent the fourth trophic level.
Equitable distribution of resources means every stakeholder has equal access to these resources. There should be equitable distribution of resources because 1. Each stakeholder will get their share of the resources. 2. The excessive exploitation of resources would not there.
Equitable distribution of resources means every stakeholder has equal access to these resources.
There should be equitable distribution of resources because
1. Each stakeholder will get their share of the resources.
2. The excessive exploitation of resources would not there.
If the resources are used with long term perspective: The demand of present as well as the future generations will be met. If the resources are used in the long run, there might be enough time for the resources to get replenished. In such a situation, no generation would be deprived of resources.
If the resources are used with long term perspective:
The demand of present as well as the future generations will be met.
If the resources are used in the long run, there might be enough time for the resources to get replenished. In such a situation, no generation would be deprived of resources.
Advantages of exploiting resources with short term aims: It provides the immediate advantage of meeting current basic human needs. Fast industrialization and development.
Advantages of exploiting resources with short term aims:
It provides the immediate advantage of meeting current basic human needs.
Fast industrialization and development.
Hydrogen gas is usually liberated when an acid reacts with a metal. When zinc granules react with dilute sulphuric acid, then the bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas and zinc sulphate solution is formed. The evolved hydrogen gas can be tested by taking aRead more
Hydrogen gas is usually liberated when an acid reacts with a metal.
When zinc granules react with dilute sulphuric acid, then the bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas and zinc sulphate solution is formed.
The evolved hydrogen gas can be tested by taking a burning candle near soap solution containing hudrogen gas . If candle burns with pop sound, it confirms the evolution of hydrogen gas.
What is meant by power of accommodation of the eye?
The power of accommodation is the ability of the eye to focus on distant as well as nearby objects by changing the focal length of lens.This focal length of eyes is changed with the help of ciliary muscles.
The power of accommodation is the ability of the eye to focus on distant as well as nearby objects by changing the focal length of lens.This focal length of eyes is changed with the help of ciliary muscles.
See lessIf you could use any source of energy for heating your food, which one would you use and why?
Natural gas can be used for heating and cooking food because it is a clean source of energy. It does not produce huge amount of smoke on burning. Although it is highly inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning.
Natural gas can be used for heating and cooking food because it is a clean source of energy. It does not produce huge amount of smoke on burning. Although it is highly inflammable, it is easy to use, transport, and it produces a huge amount of heat on burning.
See lessWhat is a good fuel?
A good fuel should have the following characteristics. It should be easily available. It should be cheap. It should have a high calorific value. It should have a low ignition point, which is not lower than room temperature (so that it does not catch fire at room temperature). It should not burn tooRead more
A good fuel should have the following characteristics.
See lessIt should be easily available.
It should be cheap.
It should have a high calorific value.
It should have a low ignition point, which is not lower than room temperature (so that it does not catch fire at room temperature).
It should not burn too fast or too slowly.
What is a good source of energy?
A good source of energy fulfils the following criteria: It produces a lot of heat per unit mass. It does a huge amount of work per unit mass. It is easily accessible. It is easy to store and transport. It is economical. It produces less amount of smoke.
A good source of energy fulfils the following criteria:
See lessIt produces a lot of heat per unit mass.
It does a huge amount of work per unit mass.
It is easily accessible.
It is easy to store and transport.
It is economical.
It produces less amount of smoke.
What is the role of decomposers in the ecosystem?
Decomposers break down complex organic substances into simpler substances.Since decomposers help in decomposing dead plants and animals, they act as cleansing agents of the environment.Also, the decomposers recycle nutrients from dead plants and animals, and their waste back to the ecosystem. WithouRead more
Decomposers break down complex organic substances into simpler substances.Since decomposers help in decomposing dead plants and animals, they act as cleansing agents of the environment.Also, the decomposers recycle nutrients from dead plants and animals, and their waste back to the ecosystem.
See lessWithout decomposers, there would be a lot of dead plants and animals. Hence, the soil would lack nutrients plants need to grow and the entire ecosystem would break down.
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
The various steps in a food chain at which the transfer of food/energy takes place are called trophic levels.In a food chain, each step representing an organism forms a trophic level. For example, Grass--> Grasshopper--> Frog--> Snake In the above food chain Grasshopper eats grass, frog eatRead more
The various steps in a food chain at which the transfer of food/energy takes place are called trophic levels.In a food chain, each step representing an organism forms a trophic level.
For example,
Grass–> Grasshopper–> Frog–> Snake
In the above food chain Grasshopper eats grass, frog eats the grasshopper and snake eats the frog. Thus, Plants are the producers, and represents the first trophic level. Grasshoppers are the primary consumers, and represent the second trophic level. Frogs are the secondary consumers, and represent the third trophic level. Snakes are the tertiary consumers and represent the fourth trophic level.
See lessWhy do you think that there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?
Equitable distribution of resources means every stakeholder has equal access to these resources. There should be equitable distribution of resources because 1. Each stakeholder will get their share of the resources. 2. The excessive exploitation of resources would not there.
Equitable distribution of resources means every stakeholder has equal access to these resources.
See lessThere should be equitable distribution of resources because
1. Each stakeholder will get their share of the resources.
2. The excessive exploitation of resources would not there.
How would these advantages differ from the advantages of using a longterm perspective in managing our resources?
If the resources are used with long term perspective: The demand of present as well as the future generations will be met. If the resources are used in the long run, there might be enough time for the resources to get replenished. In such a situation, no generation would be deprived of resources.
If the resources are used with long term perspective:
See lessThe demand of present as well as the future generations will be met.
If the resources are used in the long run, there might be enough time for the resources to get replenished. In such a situation, no generation would be deprived of resources.
What would be the advantages of exploiting resources with short-term aims?
Advantages of exploiting resources with short term aims: It provides the immediate advantage of meeting current basic human needs. Fast industrialization and development.
Advantages of exploiting resources with short term aims:
See lessIt provides the immediate advantage of meeting current basic human needs.
Fast industrialization and development.
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
Hydrogen gas is usually liberated when an acid reacts with a metal. When zinc granules react with dilute sulphuric acid, then the bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas and zinc sulphate solution is formed. The evolved hydrogen gas can be tested by taking aRead more
Hydrogen gas is usually liberated when an acid reacts with a metal.
See lessWhen zinc granules react with dilute sulphuric acid, then the bubbles of the soap solution are formed. These soap bubbles contain hydrogen gas and zinc sulphate solution is formed.
The evolved hydrogen gas can be tested by taking a burning candle near soap solution containing hudrogen gas . If candle burns with pop sound, it confirms the evolution of hydrogen gas.