science & technology Online Quiz - 41

Wheat is a cereal grain by definition. The term 'corn' historically referred to any grain crop, and in some contexts 'corn' still means wheat or other grains beyond just maize.

Humus is the correct botanical term for decayed organic matter in soil. It's dark, nutrient-rich material formed by decomposed plant and animal matter.

Deciduous trees are defined by shedding leaves seasonally, and their seeds develop within fruits or fruit-like structures for dispersal. This is a fundamental characteristic distinguishing them from conifers.

Germinating seeds are metabolically very active as they break dormancy and begin growth, requiring rapid respiration to produce energy (ATP) for cell division and elongation. Mature leaves primarily photosynthesize and have relatively slower respiration rates compared to their photosynthetic activity. Therefore, the statement is false.

Animals possess nervous systems that enable rapid signal transmission and quick responses to stimuli, often in milliseconds or seconds. Plants lack nervous tissue and rely on slower chemical and hormonal signaling pathways, taking minutes to hours to respond. The statement is false.

Human-powered electricity generation from exercise typically averages around 50 watts per hour for a fit adult. This is based on empirical measurements from gym-based power generation systems, though output varies significantly with individual fitness and effort.

Norway has been a pioneer in developing floating wind farm technology, particularly in the North Sea. The Hywind project, developed by Statoil (now Equinor), was one of the world's first full-scale floating wind turbines. Japan has also explored floating wind farms, but Norway was the earliest and most prominent in planning and implementing this technology.

Several companies, including LS9 (later acquired by Renewable Energy Group), have experimented with producing synthetic crude oil, dubbed 'Oil 2.0,' using genetically modified yeast. The yeast excretes hydrocarbons that can be refined into petroleum-like fuel. Algae biofuel is a different approach that uses algae directly rather than yeast fermentation.

Piezoelectricity is the electric charge that accumulates in certain solid materials (like crystals, ceramics, and even some biological matter) in response to mechanical stress. When these materials are compressed, stretched, or deformed, they generate an electric voltage. This principle is used in various applications from lighters to sensors.

Biogas digestion, also called anaerobic digestion, is a process where microorganisms break down biodegradable material (like food waste, agricultural waste, or manure) in the absence of oxygen. This produces methane-rich biogas that can be burned for electricity or heat. While cow methane is captured (not from flatulence directly but from manure management), option C correctly describes the general process.

Using kinematic equation s = ut + (1/2)at^2: s = (4)(5) + (1/2)(10)(5)^2 = 20 + (1/2)(10)(25) = 20 + 125 = 145 meters. The man travels 145m in 5 seconds.

Using v^2 = u^2 + 2as: (12)^2 = 0^2 + 2(a)(8). This gives 144 = 16a, so a = 144/16 = 9 m/s^2. The person accelerates at 9 m/s^2.

E = mc^2 is the famous mass-energy equivalence formula derived by Albert Einstein in 1905 as part of his special theory of relativity. It shows that energy (E) equals mass (m) times the speed of light squared (c^2).

The elephant is the only mammal with four knees. This is because elephants have unique front leg anatomy - what appear to be the front 'knees' are actually wrist joints that bend backward, giving the appearance of four knee joints. Other mammals like cats, dogs, and cows only have two true knee joints on their hind legs.

Mars has the highest mountain in the solar system - Olympus Mons, which stands about 22 km (13.6 miles) high. This is nearly three times the height of Mount Everest on Earth. Jupiter, Uranus, and Earth are gas giants with no solid surface to support mountains of this scale.

Crickets are known for their ability to indicate air temperature through their chirping rate. As crickets are cold-blooded, their muscle contractions for chirping depend on ambient temperature. Dolbear's Law states that you can calculate the temperature in Fahrenheit by counting the number of cricket chirps in 14 seconds and adding 40.