Q: Which one of the following is most sensitive to environmental change?

Amphibians are one of the most sensitive groups to change, whether that is caused by habitat loss, invasive species, disease, trade or climate change. Their sensitivity to environmental threats has been generally linked to the observation that amphibians are characterized by a rather permeable skin. Given their complex life cycles and other traits, amphibians are often recognized as indicators of ecosystem health.

Q: The HIV virus weakens the immunity of a person because it destroys

The HIV virus continuously invades and destroys T-cells (lymphocytes). Eventually the body can't replace the T-cells fast enough, and the immune system deteriorates. When the immune system has deteriorated to the point that it is unable to fight off diseases, a person is diagnosed with AIDS.

Q: Which one of the following air pollutants combines with the haemoglobin of human blood and reduces its oxygen-carrying capacity, leading to suffocation and may cause even death?

Carbon monoxide (CO) is very dangerous because it binds with the haemoglobin more efficiently than oxygen does. It "hogs the seats" so that oxygen can't get a ride. And those CO molecules keep riding around, never giving their seats up to the oxygen. This means there is no way to get oxygen to the brain, heart, or other cells and those cells start to die. And finally, it leads to suffocation and even death of a person.

Question 1

The 105th Indian Science Congress meeting was held in ______.

Accepted Answer

The Indian Science Congress – the largest gathering of Indian scientists – was scheduled to be held at Osmania University in Hyderabad from January 3 to 7. For the first time in its history, it was rescheduled to March 16-March 20 and its venue was moved to the Manipur University, Imphal after the Osmania University administration said it would not be able to host the event fearing agitations on campus.

Question 2

Term ‘Visible Horizon’ in astronomy is defined as:-

Accepted Answer

Visible Horizon is the circle of contract, with the earth, of the cone of visual rays passing through the point of observation.

Question 3

Limonitic ore is the ore of which metal?

Accepted Answer

Limonite is one of the two principal iron ores, the other being hematite, and has been mined for the production of iron.

Question 4

Which one of the following gases is released mostly from landfills in urban areas?

Accepted Answer

Decomposing waste in the landfills, by the action of microorganisms, produce methane and carbon dioxide. Landfill gas consists of 40-60% of methane and rest is carbon dioxide. Trace amount of volatile organic compounds (<1) are also present which mainly comprise of hydrocarbons.

Question 5

Which one of the following is most sensitive to environmental change?

Accepted Answer

Amphibians are one of the most sensitive groups to change, whether that is caused by habitat loss, invasive species, disease, trade or climate change. Their sensitivity to environmental threats has been generally linked to the observation that amphibians are characterized by a rather permeable skin. Given their complex life cycles and other traits, amphibians are often recognized as indicators of ecosystem health.

Question 6

The HIV virus weakens the immunity of a person because it destroys

Accepted Answer

The HIV virus continuously invades and destroys T-cells (lymphocytes). Eventually the body can't replace the T-cells fast enough, and the immune system deteriorates. When the immune system has deteriorated to the point that it is unable to fight off diseases, a person is diagnosed with AIDS.

Question 7

Which one of the following air pollutants combines with the haemoglobin of human blood and reduces its oxygen-carrying capacity, leading to suffocation and may cause even death?

Accepted Answer

Carbon monoxide (CO) is very dangerous because it binds with the haemoglobin more efficiently than oxygen does. It "hogs the seats" so that oxygen can't get a ride. And those CO molecules keep riding around, never giving their seats up to the oxygen. This means there is no way to get oxygen to the brain, heart, or other cells and those cells start to die. And finally, it leads to suffocation and even death of a person.

General Science Questions