421. According to Wein’s displacement law, the wavelength at which maximum radiation occurs

A. Is inversely proportional to the temperature
B. Is proportional to the temperature
C. Is inversely proportional to the pressure
D. Is proportional to the pressure
✅ The correct answer is option A.
According to Wein’s displacement law, the wavelength at which maximum radiation occurs is inversely proportional to the temperature.

424. In a population, unrestricted reproductive capacity is called as

A. carrying capacity
B. biotic potential
C. birth rate
D. fertility rate
✅ The correct answer is option B.
Biotic potential is defined as the physiological capacity of organisms to produce their offspring under natural conditions. It is also called reproductive potential. In nature, the biotic potential of organisms is enormous but all the organisms do not survive due to the lack of food and space.

426. The major reservoir of carbon is

A. The atmosphere
B. Ocean Bed
C. Plant and animals
D. Rock
✅ The correct answer is option B.
There are four major reservoirs, or stocks, of carbon on Earth: 1) in rocks (this includes fossil fuels), 2) dissolved in ocean water, 3) as plants, sticks, animals, and soil (which can be lumped together and called the land biosphere), and 4) as a climate-warming gas in the atmosphere.

427. Blue whale is placed under

A. Endangered
B. Critically endangered
C. Rare
D. Extinct
✅ The correct answer is option A.
The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whale suborder Mysticeti. Reaching a maximum confirmed length of 29.9 meters (98 feet) and weight of 173 tonnes (190 tons), it is the largest animal known to have ever existed. Blue whale is placed under endangered.

429. What is Bagasse? What is it used for?

A. Sugar cane waste –used as to make paper
B. Biogas — used as fuel
C. Liquid waste –used as fertilizer
D. Vermi compost – used as fertilizer
✅ The correct answer is option A.
Bagasse is the dry pulpy fibrous residue that remains after sugarcane or sorghum stalks are crushed to extract their juice. It is used as a biofuel for the production of heat, energy, and electricity, and in the manufacture of pulp and building materials.