Why is circulation of water necessary in the environment ? Discuss any two human activities which are disturbing the water cycle.
Once you have been infected with small pox, there is no chance of suffering from it again. Give reason.
Characteristics of some organisms are given. Identify their group and give one example of each.
(a) Single called, eukaryotic and photosynthetic
(b) The body is divided in to segments, may be unisexual orhermaphrodite.
|Name the disease that can be caused by UV rays.|
Under which of the following conditions is a person most likely to fall sick?
(a) when she is recovering from malaria.
(b) when she has recovered from malaria and is taking care of someone suffering from chicken-pox.
(c) when she is on a four-day fast after recovering from malaria and is taking care of someone suffering from chicken-pox.
|The heaps of solid waste are a menace. Give two reasons.|
How many times did you fall ill in the last one year? What were the illnesses?
(a) Think of one change you could make in your habits in order to avoid any of /most of the above illnesses.
(b) Think of one change you would wish for in your surroundings in order to avoid any of/most of the above illnesses.
Explain Binomial Nomenclature ? Name the scientist who has given it. Write its advantage ?
Give reason Lichens do not grow in Delhi whereas they commonly grow in Manali or Darjeeling.
|Suggest three ways to prevent spreading of infectious diseases.|
|Why are antibiotics effective against bacteria but not against viruses ?|
|Write one symptom each shown by a person if : |
(a) lung is infected
(b) brain is infected
(c) liver is infected
|hy do the terrestrial life forms require fresh water ?|
|Name two diseases against which infants below one year are vaccinated.|
|What are the two forms of oxygen found in the atmosphere ?|
|Give the chemical formula of ozone. What is its role in atmosphere ?|
|Give any two reasons why mosses are found in moist and humid places.|
|Mention two factors on which severity of disease manifestation depends ?|
|In which of the following case do you think the long-term effects on your health are likely to be most unpleasant?|
• If you get jaundice,
• if you get lice,
• If you get acne.
Many Municipal Corporations are trying water harvesting to improve the availability of water. Give reason.
|State any two harmful effects each of |
(a) Air pollution
(b) Water pollution
Write a note on how forests influence the quality of our air, soil and water resources.
Explain in how many ways O2 is used up from the atmosphere and how it returns back to atmosphere.
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
|“High blood pressure can be caused by excessive weight and lack of exercise.” |
Justify the statement.
|What are gymnosperms ? Give two characteristics.|
Which organisms are called primitive and how are they different from the so-called advanced organisms?
|How is green house effect related to Global warming ? Explain.|
Identify the class of animals having the following characteristic features.
(a) The warm blooded animals that lay eggs and have four chambered heart and a covering of feathers.
(b) The cold blooded animals having scales and they breathe through lungs.
Give reasons of the following :
(i) We are lucky that ozone is not stable near the earth’s surface.
(ii) The combustion of fossil fuels increases the amount of suspended particles in air.
What are green house gases ? What happens when percentage of these gases increase in atmosphere ?
|What do you understand by ozone layer depletion ?|
Which division among plants has the simplest organisms?
|What are the symptoms shown by a person if : |
(i) Lungs get infected ?
(ii) Stomach is infected ?
|To which group do the following belong : |
(i) Evergreen trees that bear naked seeds.
(ii) Plants which have tap root system and two cotyledons in their seeds.
|How temperature and water help in soil formation ?|
|Pick the odd one out and justify your choice by giving reasons. |
(a) Moss, Fern, Pinus, Spirogyra.
(b) Sea Cucumber, Octopus, Feather Star, Star fish.
|Explain carbon cycle with the help of flow diagram.|
|‘Pesticides reduces soil fertility’. Give two reason for your answer.|
|Define biogeochemical cycle. Give examples also.|
|How do reptiles differ from amphibians ?|
Will advanced organisms be the same as complex organisms? Why?
We are lucky that ozone is not stable near to the Earth’s surface. Why ? Give appropriate answer.
|Discuss any three limitations to deal with the infectious diseases.|
What is human immune system ? What is a vaccine ? How immunisation can be achieved ?
Why do organisms need water?
|How many chambers do the heart of fish, amphibians and mammals have ?|
How can we say that sea horse is a fish while jelly fish is not a fish but a coelenterate ?
In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic?
|What is soil erosion ? State any one way by which it can be prevented.|
|Name any one method by which water helps in the formation of soil.|
What precautions can you take in your school to reduce the incidence of infectious diseases?
List the four conventions that are followed while writing the scientific names of an organism ?
|Write few common signs and symptoms of a disease if brain is affected.|
|With the help of a neat labelled diagram, depict the cycling of carbon in nature.|
|Name the bacteria responsible for nitrification in nature.|
|Which part of the solar radiation is absorbed by ozone layer ?|
Why is Nitrogen cycle said to be a perfect cycle ? Name two leguminous plants which can fix free nitrogen.
“Forests influence the quality of our air, soil and water resources“. Justify the statement.
What are the two forms of oxygen found in the atmosphere?
Briefly explain why making antiviral medicines is harder than making antibacterial medicines.
What are the different means by which infectious diseases are spread?
A hefty boy of 12 years often picks fights with others. Do you think he is in good health ? If so, then explain your answer.
What is humus ? What is the role of earth worms in increasing the quantity of humus ?
Identify the plant bodies, which are commonly named as ‘cryptogamae’. State and explain two characteristics, which are exhibited by each category of these plant bodies.
|List two features which differentiate Chordates from non-chordates.|
How is soil formed?
|How are clouds formed?|
On which factor the severity of disease manifestation depends ? Explain with an example.
|What is soil erosion ? List two activities which cause soil erosion.|
Describe briefly one biological and one physical method of conversion of nitrogen to forms like nitrates and nitrites.
List any three human activities that you think would lead to air pollution.
|Name two factors that make soil.|
What is the primary characteristic on which the first division of organisms is made?
|Name the classes of vertebrates which lay eggs with shells.|
‘Water is known as A Wonder Liquid’. Justify this statement by giving any two reasons.
How would you choose between two characteristics to be used for developing a hierarchy in classification?
|What are vertebrates ? Name four sub groups of vertebrates.|
Explain the role of atmosphere as a blanket. List the factors deciding the rainfall patterns.
List in the tabular form any three differences between the Aves and the Mammalia group.
How do poriferan animals differ from coelenterate animals?
Name two diseases for which the children below the age of one year should be vaccinated.
Which organisms are called primitive ? How are they different from the advanced organisms ?
|State the role of symbiotic bacteria in nitrogen cycle in nature.|
Write any two characteristics of class mammalia. Name one egg laying mammal.
|Give an example each of disease caused by |
A baby is not able to tell her/his caretakers that she/he is sick. What would help us to find out
(a) that the baby is sick?
(b) what is the sickness?
How do gymnosperms and angiosperms differ from each other?
|Is the atmosphere on Venus and Mars different from our atmosphere ? How ?|
Depict the oxygen cycle. Mention the three processes in which oxygen is used up from the atmosphere and the only process in which it is returned to the atmosphere.
“Prevention of disease is more desirable than its treatment”. Justify the statement by discussing three major strategies to be adopted for the prevention of infectious diseases.
|State in brief the principle of immunisation.|
|Suggest two methods to control air pollution.|
|What are the forms of oxygen found in the atmosphere ?|
|Why is atmosphere essential for life ? Write two points in support of your answer.|
|Name any two diseases that can be prevented by immunisation.|
List the major divisions in kingdom plantae. Write the characteristic features of any one of them.
|Write the full form of CFC.|
|Match the following columns with correct answer :|
What is the greenhouse effect?
|Name any two factors responsible for the formation of soil.|
|Write down the 4 characteristic features of the members of the class Aves.|
List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?
|Why taking an antibiotic is not effective in the common cold ?|
We know that many human activities lead to increasing levels of pollution of air, water bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
|Mention the two ways of preventing ‘diseases’ ?|
How addition of undesirable substances and change in temperature affect the water life.
|Give two causes of soil erosion.|
A flowering plant whose embryo possesses single cotyledon (Give scientific term)
|What is atmospheric fixation of Nitrogen ?|
|State any two conditions essential for being free of disease.|
Describe green house effect. How the presence of green house gases would lead to global warming ? Explain.
|Give one characteristic difference between primitive and advanced organisms.|
Why is water so necessary for all living organisms ? Mention any two points in support of your answer.
Name any two environmental problems caused by various activities of human beings.
|How are CFCs harmful for the environment and living beings ?|
Name the group of plants which consists of nitrogen fixing bacteria in the root nodules ?
What is the criterion for classification of organisms as belonging to kingdom Monera or Protista?
Under which of the following conditions are you most likely to fall sick?
(a) when you are taking examinations.
(b) when you have travelled by bus and train for two days.
(c) when your friend is suffering from measles.
|Name any two water pollutants.|
|Which organ is affected if a person is suffering from jaundice ?|
|Give definition of ‘health’ ?|
|Name two air pollutants which when dissolve with water gives rise to acid rain.|
Which do you think is a more basic characteristic for classifying organisms?
(a) The place where they live.
(b) The kind of cells they are made of. Why?
|Mention the two ways in which carbon dioxide is fixed in the environment.|
|What is immunization?|
Why are we normally advised to take blend and nourshing food when we are sick ?
|Which group of plants is known as ‘flowering plants’ ?|
|Name two types of diseases caused by regularly breathing the polluted air.|
A doctor/nurse/health-worker is exposed to more sick people than others in the community. Find out how she/he avoids getting sick herself/himself.
|Suggest any two ways to prevent being infected by protozoa.|
How are pteridophytes different from the phanerogams?
|What are the biotic components of biosphere ?|
|State the effect of the following on aquatic organisms : – |
(a) Removal of dissolved oxygen
(b) Change in temperature
|State one use of ozone.|
Name the two gases given out by burning of fossil fuels which dissolve in rain water to form acid rain.
What is the function of ozone which is present in the upper level of the atmosphere ?
Write one main characteristic feature that differentiates Gymnosperms from Angiosperms. Give one example of each of a Gymnosperm and an Angiosperm.
Many human activities lead to increasing levels of pollution of air, water bodies and soil. “Isolating these activities to specific and limited areas would not help in reducing pollution”. Justify this statement giving at least five reasons.
Describe in brief the role of Nitrogen fixing bacteria and of lightening in fixing atmospheric nitrogen.
|List two ways by which carbon dioxide is ‘fixed’ in the environment.|
|Why is the atmosphere essential for life?|
|List out any two factors that determine the soil type.|
In the hierarchy of classification, which grouping will have the smallest number of organisms with maximum characteristics in common and which will have the largest number of organisms ?
|An element X has a mass number 27 and it contains 13 protons. |
(i) Write the symbolic representation of the element.
(ii) Find the number of neutrons and electrons in the element
(iii) Write the electronic configuration of the element.
Which symbiotic life forms can grow on stones and help in the formation of soil ? Write the mode of their action for making soil from rocks.
What causes winds?
What are the causes of increase in the concentration of carbon dioxide in the atmosphere ? How is carbon dioxide converted into organic compounds ? Justify with the help of a labelled diagram.
|Mention the two ways of fixing carbon dioxide.|
|How do diseases spread through air ? Name two such diseases.|
Write any three differences between Amphibia and Mammalia belonging to kingdom Animalia.
|In which part of legumes nitrogen fixing bacteria are present ?|
Which system of our body is activated in response to infection and how it responds ?
List the conventions used for writing a scientific name. What is the importanc of scientific names ?
|On the basis of seed how a maize plant is different from a pea plant ?|
Antibiotics do not work against viral infections. Give reason. Name two viral infections transmitted by means of air.
|Define the term ‘Smog’.|
“In our country majority of children are already immune to hepatitis A without giving its vaccine to them.” Justify this statement giving three reasons.
|Which gas is the major component of the atmosphere of Venus and Mars ?|
|What is an epidemic disease ?|
|Mention the symptoms because of which you will visit the doctor and why?|
|Why is there a need for classification and systematic naming of living organisms ?|
Explain why antibiotics are more effective in curing bacterial diseases than viral diseases.
|List two means of spreading of infectious diseases.|
|How does the atmosphere act as a blanket?|
|Why do we classify organisms?|
You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
State and explain in brief the four major factors, which are the causes of disease.
|Name the winds which bring rain in India.|
A spring is compressed, what change is expected in the potential energy of the spring ?
|Why does Mathura refinery pose problem to the Taj Mahal ?|
Ravi suffered from tuberculosis, while Rehman suffered from typhoid. Which Disease caused more damage and why ?
If a person is suffering from jaundice, name the mode of its transmission and the organ affected by this disease.
|Why do terrestrial forms require fresh water ?|
What is the major source of fresh water in the city/town/village where you live?
|Name two measures that can be taken to reduce water pollution.|
|In which phylum will you place the organisms which have |
(i) Calcareous spines on their body ?
(ii) The presence of holes or pores all over the body ?
|Why is it difficult to develop vaccine for viral diseases ?|
Name the system affected by AIDS. Mention the cause of death of people suffering from AIDS ?
What is top soil ? Mention any two factors that decide which plants will thrive on that soil.
|Name any one disease caused when the microbes target : |
|State any two conditions essential for good health.|
Name two biologically important compounds that contain both oxygen and nitrogen.
Give three examples of the range of variations that you see in life-forms around you.
|Define the terms and give one example of each |
(i) Bilateral symmetry
Conduct a survey in your neighbourhood to find out what the three most common diseases are. Suggest three steps that could be taken by your local authorities to bring down the incidence of these diseases.
Doctors diagnosed that Radha was suffering from HIV-AIDS. List any two methods by which she might have contacted the disease. Name the organ affected by this disease.
|What are the principles of treatment of a disease ?|
|Explain how HIV-AIDS virus affects and damages our body ?|
|Name the phylum to which the following are included. |
|Why antibiotics cannot be used for its treatment ? Justify your answer.|
What are the two adaptive features of birds ? What is the scientific name of ostrich ?
In the hierarchy of classification, which grouping will have the smallest number of organisms with a maximum of characteristics in common and which will have the largest number of organisms?
|Give one local and one general effect of inflammation process.|
Differentiate between acute and chronic diseases. Give one example each of acute and of chronic diseases.
|How the biosphere is a dynamic and stable system ?|
|What is binomial nomenclature ? Who introduced it ?|
In coastal area, wind current moves from sea towards the land during day; but during night it moves from land to sea. Discuss the reason.
Ajit is suffering from Malaria. Which part of his body will be affected ? Name the vector for this disease. Write any one way to prevent this disease.
Explain the basis for grouping organisms into five kingdoms.
How are living organisms dependent on soil? Are organisms that live in water totally of independent soil as a resource.
|Mention any two causes of baby’s disease.|
|Name two Nitrogen, compounds obtained by industrial fixation.|
It has been observed that despite the availability of the vaccine for Hepatitis A in the market, it may not be necessary to be given to children by the time they are 5 years old. Why ?
|How the presence of pollutants present in the air does affect our health ?|
Why are we normally advised to take bland and nourishing food when we are sick?
|Write two methods adopted to control pollution ?|
|How do the saprophytes get their food ? Give two examples of a saprophyte.|
Who proposed the five kingdom classification ? What is the basis of this classification ?
What is meant by Biogeochemical cycle. Name the two essentials which are transferred between different components of the biosphere.
List any three human activities which would lead to an increase in the carbon dioxide content of air.
|Explain with the help of a labelled diagram carbon cycle in nature.|
|Bats can not see still they catch their prey. Explain.|
Give two differences between bony fish and cartilagious fish. Give one example of each.
|How do annelid animals differ from arthropods?|
On what basis are plants and animals put into different categories?
|How do forests influence the following : |
|In which type of plants are nitrogen fixing bacteria present.|
List any two differences between Infectious and Non - infectious diseases. Write any one example of each disease.
|Give two examples where fresh water can be found in the frozen form on the earth.|
|Do you know of any activity which may be polluting this water source?|
State two consequences, which one has to face while dealing with an infectious disease ?
State Law of conservation of mass ? If 12 g of carbon is burnt in the presence of 32 g of oxygen, how much carbon–dioxide will be formed ?
Account for the statement : “camel walks easily on sand but it is difficult for a man to walk on sand though a camel is much heavier than a man”.
Define antibiotic ? Explain how it is able to control bacterial infections but not viral infections.