Biology
Kishan and Malti are married and have three children. They have decided not to have any more children and are considering permanent surgical methods of contraception.
(a) Which surgical method can Kishan undergo ?
(b) Can Malti also undergo some sort of a permanent surgical method like Kishan as answered by you in (a)?
(c) Out of (a) and (b), explain why (a) is preferred over (b) when considering permanent contraception ?
Related Questions
Study the pictures given below of the two main categories of wastes and answer the questions:
(i) Identify the categories of wastes in (A) and (B).
(ii) Which of the above category of wastes can be used to prepare compost?
(iii) Mention one control measure to manage the waste of category (B).
Pollution is on the rise due to a rapid increase in the number of automobiles and buildings. All of these release a large amount of harmful gases and particulate pollutants in the atmosphere which react with atmospheric moisture and produce various kinds of acidic gases.
(i) Mention two main gases which are emitted from the industries into the atmosphere.
(ii) What are the two main acids produced in the atmosphere when poisonous gases combine with the atmospheric moisture ?
(iii) Write two harmful effects of acid rain.
Excessive use of fertilizers is harmful because these fertilizers are washed away with rain water and reach ponds, lakes, etc. causing pollution and various other changes in the water bodies. Which of the following options does not occur because of the water pollution caused by fertilizers ?
- Faster growth of bacteria
- Faster growth of fish and other aquatic animals
- Consumption of a lot of oxygen
- Death of fish and other aquatic animals
Pollution affects our climate and environment in several ways, like acid rain, greenhouse effect and global warming, ozone layer depletion, etc. The earth's temperature is maintained by the balance of incoming and outgoing solar radiations. Solar energy from the sun passes through the atmosphere to the earth and reflected back into space. While greenhouses help plants thrive in cold winters, the greenhouse effect has become a major cause of global warming.
(i) Greenhouses are small houses specially constructed to grow plants during adverse climatic conditions. Choose the incorrect statement from the following options :
- These houses are structures built with walls and roofs, made up of glass and other transparent materials.
- The roofs and walls of these houses are covered with green grasses to maintain the internal temperature.
- The glass panels all around the greenhouse let sunlight enter but do not allow the heat to escape.
- Both 1 and 3
(ii) The rise in earth's temperature is called global warming which is caused due to many reasons. Choose the incorrect option from the statements given below :
- Depletion of ozone layer in the atmosphere is the main cause of global warming.
- Increased industrialisation, burning of fuels in houses and rising population release more carbon dioxide in the atmosphere, causing global warming.
- Greenhouse gases accumulate in the atmosphere which prevent the escape of heat.
- Deforestation is also an additional cause of global warming.
(iii) Ozone is an allotropic form of oxygen which forms a sort of a screen high up in the atmosphere. Though it is highly poisonous and harmful to all living organisms, it is essential for the existence of life on earth. Choose the incorrect option :
- Ozone occurs in significant amounts in the stratosphere which absorbs ultraviolet radiations.
- It prevents the harmful infrared rays coming down to the earth from the sun.
- CFCs and HCFCs released from refrigerators and aerosol sprayers deplete ozone layer and create a hole in the ozone layer.
- Depletion of ozone layer can cause skin cancer, genetic disorders, cataract, etc.