1622. IUCN (The International Union For Conservation Of Nature And Natural Resources) headquarters is at

A. Gland, Switzerland
B. Paris, France
C. Vienna, Austria
D. NewYork, USA
✅ The correct answer is option A.
Its headquarters are in Gland, Switzerland. IUCN has observer and consultative status at the United Nations and plays a role in the implementation of several international conventions on nature conservation and biodiversity.

1626. All the statements are correct regarding ecological succession except

A. It is a random process
B. Species diversity increases as succession proceeds
C. The food chain relationships becomes more complex
D. The role of decomposers becomes more and more important
✅ The correct answer is option A.
All the statements are correct regarding ecological succession except that it is a random process.

1628. If the average temperature of the sun increased, the wavelength of peak solar emission would:

A. Shift to a shorter wavelength
B. Shift to a longer wavelength
C. Remain the same
D. Impossible to tell from given information
✅ The correct answer is option A.
If the average temperature of the sun increased, the wavelength of peak solar emission would decrease.

1629. The Native Place of Redwood trees?

A. Australia
B. Amazon
C. California
D. Thailand
✅ The correct answer is option C.
Though they once thrived throughout much of the Northern Hemisphere, today redwoods are only found on the coast from central California through southern Oregon. They do not live more than 50 miles inland, and are usually found in long belts, rather than small groves.

1630. Ozone depletion in the stratosphere will cause

A. increased incidence of skin cancer
B. forest tires
C. global warming
D. none of these
✅ The correct answer is option A.
Ozone depletion occurs when chlorofluorocarbons (CFCs) and halons—gases formerly found in aerosol spray cans and refrigerants—are released into the atmosphere. CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone’s ultraviolet radiation-absorbing capacity.