TN State Board Samacheer Kalvi Online Test for 12th Std - Biology - English - Bio Botany - Environmental Issues

Question 1 Of 10

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?

Ammonia Methane Nitrous oxide Ozone

Question 2 Of 10

The unit for measuring ozone thickness

Joule Kilos Dobson Watt

Question 3 Of 10

With respect to Eichhornia.

Statement A is correct and Statement B is wrong. Both Statements A and B are correct. Statement A is correct and Statement B is wrong. Both Statements A and Bare wrong.

Question 4 Of 10

The plants which are grown in silivpasture system are

Sesbania and Acacia Solenum and Crotalaria Clitoria and Begonia Teak and sandal

Question 5 Of 10

Which of the following would most likely help to slow down the greenhouse effect.

Converting tropical forests in to grazing land for cattle. Ensuring that all excess paper packing is buried to ashes. Redesigning landfill dumps to allow methane to be collected. Promoting the use of private rather than puplic transport.

Question 6 Of 10

Find the wrongly matched pair.

Endemism – Species confined to a region and not found anywhere else. Hotspots – Western ghats. Ex-situ Conservation – Zoological parks. Alien sp. Of India – Water hyacinth.

Question 7 Of 10

One green house gas contributes 14% of total global warming and another contributes 6%. These are respectively identified as

N2O and CO2 CFCS and N2O CH4 and CO2 CH4 and CFCS

Question 8 Of 10

Deforestation means

growing plants and trees in an area where there is no forest growing plants and trees in an area where the forest is removed growing plants and trees in a pond removal of plants and trees

Question 9 Of 10

One of the chief reasons among the following for the depletion in the number of species making endangered is.

over hunting and poaching green house effect competition and predation habitat destruction

Question 10 Of 10

Deforestation does not lead to

Quick nutrient cycling soil erosion alternation of local weather conditions Destruction of natural habitat weather conditions

Tamil Nadu State Board ( Samacheer Kalvi ) Online Test based on Book Back Questions - 12th Standard Biology - English Medium - Bio Botany - Environmental Issues

Samacheer Kalvi 12th Biology - Bio Botany - Environmental Issues - Book Back Questions in English Medium