1. How many pairs of chromosomes are there in humans?

 

 21

 23

 38

 48

 2. The term 'gene' for the factor controlling heridity was coined by:

 3. Who proposed the 'one gene one enzyme' hypothesis suggesting that one gene controls the synthesis of one enzyme?

 James Watson

 Joshua Lederberg

 George Church

 Beadle and Tatum

 4. Chocolate can be bad for health because of a high content of:

 

 Carbon

 Mercury

 Nickle

 Lead

 5. The Montreal Protocol is related to:

 

 Combating climate change

 Sustainable development

 Ozone depletion

 Setting internationally binding emission reduction targets

 6. The nearest planet to the Sun is:

 Mercury

 Venus

 Earth

 Mars

 7. The biggest planet of the solar system is:

 Saturn

 Sun

 Neptune

 Jupiter

 8. The brightest planet in the solar system is:

 Sun

 Earth

 Mars

 Venus

 9. What is the smallest continent of earth?

 Asia

 Africa

 Europe

 Australia

 10. Which is the most abundant gas in the earth's atmosphere?

 Oxygen

 Hydrogen

 Nitrogen

 Carbon dioxide