Answer: C

Explanation:

American scientists have discovered a new species of worm. They claim that this tiny creature can prove helpful in keeping crops safe from pests even without pesticides. According to the information received, these microscopic worms first infect the insects and then destroy them. Scientists have named this new species 'Steinernema adamsii' in honor of American biologist Byron Adams. Hence, statement 1 is correct.

Referring to the physical structure of this new creature, scientists write that they are very small in size, it is almost impossible to see them without a microscope. Their width is about half that of a human hair and their length is less than one millimeter. It is noteworthy that this new species of worm is a member of the nematode family called Steinernema. Steinernema nematodes were first discovered in the year 1920. They have been used for a long time to control pests of crops. Hence, statement 2 is correct.

Answer: C

Explanation:

Meghdoot 'Cloud Messenger Hindi' has been developed by a joint initiative of India Meteorological Department, Indian Institute of Tropical Meteorology and Indian Council of Agricultural Research to provide weather forecast and weather-based advice to farmers.

Meghdoot mobile app is active since the monsoon period of 2019 and now this application has added additional facilities for the farmers. Block level features have also been included in the updated version of the app, where farmers can gather block level information to deal with weather related threats. Hence, statement 1 is correct.

Block level weather forecast for about 6970 blocks and block level agromet advisory for 3100 blocks have been added to the app. Now users can register their locality to get the updated app. Hence, statement 2 is correct.

Answer: C

Explanation:

A synthesis reaction, also known as a combination reaction, occurs when two or more reactants combine to form a single, more complex product. An example of a synthesis reaction is the formation of water (H₂O) from hydrogen gas (H₂) and oxygen gas (O₂). Hence, pair 1 is correctly matched.

A decomposition reaction is the opposite of a synthesis reaction. It involves the breakdown of a complex compound into simpler substances. One common example is the decomposition of hydrogen peroxide (H₂O₂) into water (H₂O) and oxygen gas (O₂). Hence, pair 2 is correctly matched.

The Combustion reactions occur when a substance reacts rapidly with oxygen, typically accompanied by the release of heat and light. The most familiar example of a combustion reaction is the burning of a hydrocarbon fuel, such as gasoline or natural gas, in the presence of oxygen to produce carbon dioxide (CO₂) and water (H₂O). Hence, pair 3 is correctly matched.

Answer: C

Explanation:

The Geological Time Scale is a framework or system that geologists and other scientists use to organize and categorize Earth's history into different units or time periods. It provides a chronological timeline that helps in studying and understanding the events and processes that have shaped the Earth over billions of years. The time scale includes divisions such as eons, eras, periods, epochs and ages. Hence, statement 1 is correct.

The Hadean Eon refers to the earliest period in Earth's history, extending from the formation of the Earth around 4.6 billion years ago to about 4 billion years ago. During this eon, the Earth was characterized by intense heat, frequent volcanic activity, and heavy bombardment by asteroids and other celestial bodies. The name "Hadean" comes from the Greek god Hades, representing the hellish conditions that prevailed on Earth during that time. The Hadean Eon predates the formation of the oldest known rocks on Earth, which were formed during the subsequent Archean Eon. Hence, statement 2 is correct.

Answer: C

Explanation:

The Archean Eon is not the second eon but rather the third eon in Earth's history. It follows the Hadean Eon and precedes the Proterozoic Eon. The Archean Eon is indeed characterized by significant geological and biological developments. During this time, the Earth's crust began to stabilize, leading to the formation of the first stable continents. Additionally, early life forms such as bacteria and archaea emerged during the latter part of the Archean Eon. Hence, statement 1 is correct.

The Proterozoic Eon is the second eon in Earth's history, succeeding the Archean Eon. It is indeed the longest eon, spanning from around 2.5 billion years ago to approximately 541 million years ago. During the Proterozoic Eon, oxygen-producing organisms such as cyanobacteria became widespread, leading to the oxygenation of the Earth's atmosphere. This increase in oxygen levels had a significant impact on the evolution of life forms. Hence, statement 2 is correct.