Sunday, 7 July 2019

10th Biology Chapter 7 Man And His Environment Notes

10th Biology Chapter 7 Man And His Environment Notes

10th Biology Chapter 7 Man And His Environment Notes

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Q. No.1 Define environment
 ENVIRONMENT
 The sum of physical (abiotic) and biological (biotic) conditions which influence the organism is called the environment of that organism.
 Q. No. 2 Define ecology
 ECOLOGY
 The branch of Biology that deals with the study of the interrelationship between organisms and their environment is called ecology 
Q. No. 3 What are biogeochemical cycles?
 BIOGEOCHEMICAL CYCLES
 The avelic pathways through which materials move from environment to organisms and back to environment are called biogeochemical cycles.
 Q. No. 4 Why carbon cycle is called perfect cycle?
 CARBON CYCLE AS PERFECT CYCLE
 Carbon cycle is a perfect cycle in the sense that carbon is returned to atmosphere as soon as it is removed
 0. No. 5 How the balance of carbon cycle has been upset by human activities?UPSET OF CARBON CYCLE 
The balance of carbon cycle has been upset by human activities such as Deforestation
 Excessive burning of fossil fuels
 Q. No. 6 What are the consequences of increasing concentration of carbon dioxide ia atmosphere?
 CONSEQUENCES OF INCREASED CONCENTRATION OF CARBON DIOXIDE Esaresult, the amount of carbon dioxide in atmosphere is increasing, causing The green house effect
 Global warming
 0. No. 7 How is denitrification stimulated?
 STIMULATION OF DENITRIFICATION
 cessive denitrification reduces soil fertility and is stimulated by Water logging
 Lack of aeration
 Accumulation of organic matter
Q. No. 8 In what things plants show competition?
 COMPETITION IN PLANTS
 Plants also show competition for
 Space
 Light
 Water
 Minerals
 Q. No. 9 What is the relationship between survival of host and parasite?
 SURVIVAL OF HOST AND PARASITE
 Host can survive without parasite, but parasite cannot survive without host.
 0. No. 10 Why biogeochemical cycles are called as nutrient cycles?
 BIOGEOCHEMICAL CYCLES AS NUTRIENT CYCLES
 The movement of elements and inorganic compounds is essential for maintenance of life, they are also called 'nutrient cycles'. Carbon cycle is a perfect cycle in the sense that carbon is returned to atmosphere as soon as it is remov 
Q.No. 11 What is the difference between intraspecific and interspecific interactions?
Q. No. 12 What is Intergovernmental Panel on Climate Change (IPCC)?
 INTERGOVERNMENTAL PANEL ON CLIMATE CHANGE (IPCC) In 1990, the United Nations established Intergovernmental Panel on Climate Change (IPCC). It provides scientific advice to the world leaders on issues like the build-up of greenhouse gases and its prevention. According to IPCC, Earth's surface temperature has increased 0.2°C per decade in the past 30 years 
Q.No. 13 How Maldives' survival is on the cat?
 THE MALDIVES' SURVIVAL
 Scientists fear that the sea level is rising up to 0.9cm a year. Rise in sea level has worst effects on coastal countries. Most of the islands of the Maldives are less than 1 metre above sea level. It is estimated that within 100 years, the Maldives might become uninhabitable and the citizens would be forced to evacuate.
 Q.No. 14 What is the relationship between honeyguide bird and badgers?
 HONEYGUIDE BIRD AND BADGERS
 The honeyguide bird feeds on wax and the larvae present in honeycombs. It flies around looking for honeycombs. but it is not strong enough to open the comb. Badgers are large mammals that feed on honey When a honeyguide bird goes to find honeycombs, the badger follows it. When the bird finds a honeycomb. it calls the badger. Sometimes the bird has to stop and wait for the slow-moving badger After reaching there, the badger opens the honeycomb and both of them eat their foods together. Traditionally, humans have also used these birds to find honey bee colonies
Q.No. 15 What are pollutants?
 POLLUTANTS
 The substances that actually cause pollution are called the pollutants Examples:
 They may be:
 Industrial effluents
 Domestic wastes
 Medical wastes
 Q. No. 16 What are two types of pollutants?
 TYPES OF POLLUTANTS
 Pollutants are of two types:
 Biodegradable
 Non-biodegradable
 Q. No. 17 What is noise? What are its bad effects?
 NOISE
 The unwanted. unpleasant and annoying sounds are termed as noise. Noise is also considered as a form of pollution
 Immediate Effects:
 Immediate effects of noise pollution are
 Annoyance
 Aggression
 Long Term Effects:
 The long term effects of noise pollution are: Hearing loss
 Depression
 Hypertension
 Q. No. 18 What will be the increase in temperature in the next hundred years?
 According to estimates, at the current rate of increase, the average global temperature will go up by 3°C to 8°C in the next 100 years.
 Q. No. 19 In which countries the harmful effects of the UV rays are visible?
 HARMFUL EFFECTS OF THE UV RAYS
 The harmful effects of the UV rays are visible in the countries such as Australia and New Zealand where the rate of skin cancer is higher than the other regions of the world.

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