NEET Biology Multiple Choice Questions

NEET Biology Multiple Choice Question and Answers

 

UP Board Notes for Class 10 Science

Chapter Wise UP Board Notes for Class 10 Biology Pdf free download was designed by expert teachers from latest edition of UP Board books to get good marks in board exams. UP Board Class 10 Biology Notes contains Textbook Readers and Supplementary Readers of all chapters are part of Revision Notes for grade 10 Biology. Here we have given notes Class X.

UP Board Notes for Class 10 Science

NEET Biology Notes

NEET Biology Notes

SpaceX Rocket Fueled For Launch This Week To Send Korean Mission to Moon

SpaceX rocket is being prepared for flight this week to deliver a Korean expedition to the moon.

South Korea and SpaceX are preparing to launch a spacecraft this week on a long voyage that will eventually take it around the moon.

The Korea Pathfinder Lunar Orbiter is set to launch from Cape Canaveral, Florida, on the back of a SpaceX Falcon 9 rocket on Tuesday night.

After breaking free of Earth’s gravity, the KPLO is scheduled to enter a low-altitude orbit around the moon. Fueling and testing have been completed by South Korean engineers who went to the United States for the flight.

According to Space.org, Eunhyeuk Kim, a KPLO project scientist at the Korean Aerospace Research Institute, stated, “We hope to build key technologies for both space exploration and scientific study.”

The launch is slated for Tuesday at 7:30 p.m. EDT.

The KPLO will eventually enter a polar orbit 62 miles above the lunar surface and conduct observations for at least a year.

The project’s main goals are to detect the magnetic force above the lunar surface and to look into lunar resources such water ice, uranium, helium-3, silicon, and aluminium.

The $180 million mission will follow NASA’s CAPSTONE spacecraft, which launched last month, on a low-energy, fuel-efficient lunar course.

The expedition will also produce a topographic map, which will aid scientists on Earth in selecting future moon landing locations. NASA’s Artemis programme hopes to return humans to the moon’s surface by 2024.

The KPLO mission is the first phase in South Korea’s ambitious lunar exploration programme, which aims to deploy a robotic lander on the moon by 2030. In addition, the nation is preparing an asteroid sample-return mission.

Asteroids May Have Brought Water, Organic Matter To Earth

Asteroids that came from the solar system’s outskirts more than 4.5 billion kilometres distant may have carried water and organic materials to the ancient Earth, according to a team of Japanese researchers.

The Japan Aerospace Exploration Agency and colleagues published the theory in the scientific journal Nature Astronomy based on a study of samples from the Ryugu asteroid acquired by the Hayabusa2 space mission.

It is still unknown how the Earth, which was formed almost completely of molten lava, came to be covered with water.

Asteroids May Have Brought Water, Organic Matter To Earth

“It is plausible that small celestial bodies transported substances that led to water and life on Earth,” Motoo Ito, senior researcher of geomaterials science at the Japan Agency for Marine-Earth Science and Technology, stated.

Hayabusa2’s six-year mission brought more than 5.4 kilos of surface debris to Earth from the Ryugu asteroid, situated over 300 million kilometres distant, in December 2020.

While Ryugu particles had a near chemical match to Earth’s water, there were some minor discrepancies that led experts to speculate that Earth may have gotten its water from sources other than asteroids.

An analysis of eight particles from the Ryugu asteroid, totaling approximately 59 milligrammes, discovered organic matter and water not in liquid form, but a hydroxyl group consisting of one oxygen atom bonded to one hydrogen atom, with a composition similar to that of water found in cosmic dust and comets.

They were thought to have survived hard environmental changes after leaving the outer solar system, where water and organic matter are prevalent, since they were protected by a “cradle” of phyllosilicates.

Organic regions made mostly of aliphatic hydrocarbons were also discovered among the comparatively coarse-grained phyllosilicates. The surrounding coarse grains, which are more resistant to heat, may have prevented the environment from altering water and organic materials.

Hayabusa2 launched in 2014 and arrived in June 2018 over Ryugu after travelling 3.2 billion kilometres in an elliptical orbit around the Sun for more than three years.

The probe returned to the asteroid again the following year, gathering the first-ever asteroid subsurface samples.

Researchers earlier discovered that Ryugu, produced from an outer solar system parent body, migrated to the inner solar system and that its particles include amino acids – organic chemicals thought to be the “source of life.”

Stunning Photograph Of A Supernova Remnant Reveals Information About The Star’s Demise

Astronomers investigating the leftovers of a supernova photographed using NASA telescopes have discovered evidence that might assist establish the star’s end chronology. The supernova remnant, known as SNR 0519-69.0, is the result of a white dwarf star explosion.

After reaching critical mass, the star exploded in a thermonuclear explosion, according to NASA’s Chandra Ray Observatory. Stars often do this by absorbing mass from a companion star or merging with another dwarf star. This type of supernova is known as a Type Ia, and scientists use it for anything from analysing thermonuclear explosions to determining the distance to galaxies billions of light-years distant.

Stunning Photograph Of A Supernova Remnant Reveals Information About The Star's Demise

SNR 0519-69.0, or SNR 0519 for short, is a star in the Large Magellanic Cloud, a tiny galaxy around 160,000 light years from Earth. This composite image was created using X-ray data from NASA’s Chandra X-ray Observatory and optical data from NASA’s Hubble Space Telescope.

Low, medium, and high energy X-rays from the supernova remnant are portrayed in green, blue, and purple, with these colours overlapping to seem white in certain locations. The red border of the remnant and the white stars around the remnant are from optical data.

Scientists “rewinded” the star development and explosion that culminated in SNR 0519 using data from Chandra, Hubble, and NASA’s defunct Spitzer Space Telescope. They discovered when the star burst and learnt about its surroundings. Their findings were reported in The Astrophysical Journal.

They analysed Hubble photos of SNR 0519 taken in 2010, 2011, and 2020 to determine the velocity of the particles in the blast waves caused by the explosions. According to their estimations, it varies between 6 and 9 million kilometres per hour. If the speed was closer to the high end of that estimate, the light from the explosion would have reached Earth around 670 years ago.

However, it seems more probable that the material has slowed down since the star’s outburst, which occurred 670 years ago. The researchers discovered that the brightest spots in X-ray pictures contain the slowest-moving particles. They also discovered that the fastest-moving substance had no X-ray emission.

Ayman al-Zawahiri: Who Was Al-Qaeda Leader Killed by US?

Ayman al-Zawahiri: Who was the al-Qaeda commander assassinated by the US?

Ayman al-Zawahiri, who was murdered by a US drone attack in Afghanistan, was widely regarded as al-main Qaeda’s ideologue.

He was an eye surgeon who helped form the Egyptian Islamic Jihad terrorist group before taking over al-Qaeda leadership after Osama Bin Laden was killed by US troops in May 2011.

Prior to it, Zawahiri was regarded Bin Laden’s right-hand man, and some analysts think he was the “operational brains” behind the September 11, 2001, strikes in the United States.

Zawahiri was ranked second only to Bin Laden on the US government’s list of the 22 “most wanted terrorists” in 2001, with a $25 million (£16 million) bounty on his head.

Zawahiri became as al-most Qaeda’s visible speaker in the years following the 9/11, appearing in 16 films and audiotapes in 2007 – four times as many as Bin Laden – as the organisation attempted to radicalise and recruit Muslims throughout the world.

His assassination in last weekend’s Kabul bombing was not the first time the US intended to assassinate Zawahiri.

He was the target of a US missile attack near Pakistan’s border with Afghanistan in January 2006.

Four al-Qaeda members were killed in the attack, but Zawahiri survived and appeared on video two weeks later, telling US President George W Bush that neither he nor “all the powers on earth” could bring his death “any closer.”

illustrious family

Zawahiri was born on June 19, 1951, in Cairo, Egypt, to a respected middle-class family of physicians and professors.

His grandfather, Rabia al-Zawahiri, was the grand imam of al-Azhar, the Middle East’s centre of Sunni Islamic scholarship, and one of his uncles was the Arab League’s first secretary-general.

While still in school, Zawahiri became interested in political Islam and was detained at the age of 15 for belonging to the illegal Muslim Brotherhood, Egypt’s oldest and largest Islamist organisation.

His political activities, however, did not prevent him from studying medicine at Cairo University’s medical school, from which he graduated in 1974 and four years later received a master’s degree in surgery.

His father, Mohammed, was a pharmacology professor at the same university when he died in 1995.

Young radicals

Zawahiri first carried on the family history by establishing a medical practise in a Cairo neighbourhood, but he was quickly drawn to extreme Islamist groups seeking for the Egyptian government’s downfall.

Zawahiri has become a distant and insignificant figure in recent years, only sporadically releasing messages.

He joined Egyptian Islamic Jihad when it was created in 1973.

In 1981, he was arrested along with hundreds of other accused members of the gang after many of them killed President Anwar Sadat during a military parade in Cairo while dressed as soldiers. Sadat had enraged Islamist radicals by negotiating a peace treaty with Israel and previously detaining hundreds of his critics in a security sweep.

During the mass trial, Zawahiri emerged as a defendants’ leader and was recorded telling the court: “We are Muslims who follow our faith. We are attempting to construct an Islamic state and civilization.”

Despite being absolved of involvement in Sadat’s killing, Zawahiri was convicted of unlawful possession of weaponry and sentenced to three years in prison.

According to other Islamist detainees, Zawahiri was tortured and beaten on a daily basis by Egyptian authorities during his time in prison, an experience that is supposed to have converted him into a fanatical and violent extremist.

Zawahiri fled to Saudi Arabia after his release in 1985.

Soon after, he travelled to Peshawar, Pakistan, and then to neighbouring Afghanistan, where he founded an Egyptian Islamic Jihad faction while working as a doctor during the Soviet occupation.

After Egyptian Islamic Jihad re-emerged in 1993, Zawahiri assumed leadership and was a prominent player in a series of attacks by the organisation against Egyptian government politicians, including Prime Minister Atif Sidqi.

During the mid-1990s, the group’s drive to destabilise the government and establish an Islamic state in Egypt resulted in the deaths of over 1,200 Egyptians.

The US State Department designated him commander of the Vanguards of Conquest organisation in 1997, a branch of Islamic Jihad suspected of being behind the slaughter of Western tourists in Luxor the previous year.

He was convicted to death in absentia by an Egyptian military court two years later for his participation in the group’s numerous attacks.

During the 1990s, Zawahiri is reported to have travelled around the world in quest of refuge and finance.

He is reported to have resided in Bulgaria, Denmark, and Switzerland in the years following the Soviet departure from Afghanistan, and to have used a phoney passport to travel to the Balkans, Austria, Yemen, Iraq, Iran, and the Philippines.

He reportedly spent six months in Russian detention in December 1996 after being arrested in Chechnya without a proper visa.

According to a statement supposedly prepared by Zawahiri, the Russian authorities neglected to have the Arabic texts discovered on his computer translated, allowing him to remain anonymous.

Zawahiri is thought to have relocated to the Afghan city of Jalalabad in 1997, where Osama Bin Laden was stationed.

A year later, Egyptian Islamic Jihad formed the World Islamic Front for Jihad against Jews and Crusaders with five other extreme Islamist terrorist groups, including Bin Laden’s al-Qaeda.

The first proclamation issued by the front was a fatwa, or Islamic decree, authorising the death of US citizens. Six months later, two simultaneous assaults on the US embassies in Kenya and Tanzania resulted in the deaths of 223 individuals.

Zawahiri was one of the individuals whose satellite phone conversations were claimed as evidence that Bin Laden and al-Qaeda were responsible for the plot.

The US targeted the group’s training centres in Afghanistan two weeks after the assaults. The following day, Zawahiri called a Pakistani journalist and said: “Inform America that its bombings, threats, and aggressiveness do not fear us. The conflict has barely recently begun.”

In the years after Bin Laden’s murder, US air strikes killed a slew of Zawahiri’s deputies, undermining his capacity to coordinate internationally.

In recent years, Zawahiri has become a distant and insignificant figure, only releasing messages on occasion.

The US will celebrate his death as a success, especially after the messy pullout from Afghanistan last year, but Zawahiri wielded little weight as new groups and movements such as the Islamic State have grown in power.

Undoubtedly, a new al-Qaeda commander will emerge, but he will have even less power than his predecessor.

Russia Condemns Potential Pelosi Visit to Taiwan as ‘Provocation’

On Tuesday, Moscow condemned a possible visit to Taiwan by US House Speaker Nancy Pelosi as a provocation, expressing full support with partner China.

“What is associated with this tour and a potential visit to Taiwan is pure provocation,” Kremlin spokesperson Dmitry Peskov told reporters.

He said that the prospective visit was causing a “increase in tension” in the area and accused Washington of taking the “confrontational course.”

“We want to underscore once more that we stand in complete solidarity with China; its approach to the situation is reasonable and entirely acceptable.”

Russian Foreign Ministry spokesperson Maria Zakharova again accused the US of being confrontational in relation to the possible visit.

“Washington is causing global destabilisation. There hasn’t been a single settled disagreement in recent decades, but there have been a lot of them “She stated this on social media.

Russia has sought deeper connections with China and voiced support with Beijing over Taiwan as it faces unprecedented sanctions and international isolation as a result of its military war in pro-Western Ukraine.

China considers Taiwan to be its territory and has repeatedly warned that a visit by Pelosi would be viewed as a grave provocation.

American politicians frequently travel to Taiwan to express their support, but Pelosi, who is presently on a tour of many Asian nations, would be a more visible visitor than any in recent memory.

Democratic Taiwan is constantly threatened by Chinese occupation.

Moscow’s onslaught on Ukraine has fueled worries that Beijing would follow through on its promises to absorb its much smaller and outgunned neighbour.

UN Report Fails to Recognize Major Child Abductions in Parts of Nigeria

In its most recent annual report on children and armed conflict, the United Nations confirmed the abduction of 4,278 children in 21 countries last year, but it omitted to recognise massive kidnappings in northwest and north-central Nigeria documented by one of its own organisations in 2021.

According to the study published by the UN’s Children and Armed Conflict office, over a quarter of all abductions last year — 1,030 — were recorded in Somalia, the nation with the greatest toll. The General Assembly designated the office in 1996 to advocate for the protection of children who get unknowingly involved in hostilities. Virginia Gamba, a former UN official who specialised in disarmament in her native Argentina, heads the office as a special representative of UN Secretary-General António Guterres. Her team conducts the research for the study, yet it is distributed under his name.

Although Somalia’s data are included in the analysis, at least 1,004 kidnappings from 25 school raids in northwest and north-central Nigeria recorded by Unicef as of November 2021 were not included.

It is a bleak, numbers-heavy compendium of some of the most heinous crimes committed against children in crisis zones, including abductions, recruiting of children as armed troops, murdering, maiming, sexual assault, and attacks on schools and hospitals. (Maiming was the most common atrocity, caused by land mines and other explosive devices.) The research identifies which nations should be prioritised by the UN in its mission to safeguard and advocate for children’s human rights in conflict zones.

Nigeria, Africa’s most populous country, made stunning headlines and sparked a global movement in the aftermath of the 2014 kidnapping of hundreds of schoolgirls in Chibok, Borno state (in the northeast), capturing the attention of Michelle Obama, the American first lady at the time. But the issue, which hasn’t gone away, has returned to the shadows.

“I don’t enjoy speculating. If I had to guess, I’d say the international community hasn’t taken seriously the fact that terrorism has spread from northeast Nigeria to other parts of northwest and north-central Nigeria,” said Confidence McHarry, a security expert with SBM Intelligence, a geopolitical analysis firm, from Nigeria. “As you may recall, schools were even closed as a result of the assaults.”

June 29 Was The Shortest Day In Recorded History — A ‘Wobble’ In The Earth’s Sin Shaved Off 1.59 Milliseconds

The 29th of June was the shortest day in recorded history, thanks to a ‘wobble’ in the Earth’s spin that shaved off 1.59 milliseconds.

This summer, the Earth had its shortest day ever, due to a wobble in its axis that allowed it to complete a single spin in a fraction of a second less than 24 hours.

According to the website timeanddate.com, June 29 was 1.59 milliseconds shorter than 86,400 seconds, or exactly 24 hours.

In recent decades, the Earth has slowed down, resulting in somewhat longer days. However, in recent years, this trend has reversed, and the days have become increasingly shorter.

If the Earth continues to speed up, it may be necessary to remove a second from atomic clocks for the first time.
The Earth is not without flaws.

The Earth frequently wobbles – the spinning that we perceive as night and day does not always occur exactly in line with its axis, the line connecting the North and South Poles.

This is due to the fact that it is not an exact sphere.

The equator has a bulge, while the poles are somewhat squashed, indicating that Earth is slightly elliptical.

Other forces, like as ocean tides and moon gravity, can also interfere with the spinning.

The “Chandler sway”

Leonid Zotov, a mathematics professor, argues that the planet is rotating faster due to a periodic movement known as the “Chandler wobble.”

The wobble was discovered in the late 1880s by astronomer Seth Carlo Chandler, who noted the poles wobbling during a 14-month period.

According to the Telegraph, the wobble began to diminish in the early 2000s, hitting historic lows in 2017.

And, according to Zotov, “it vanished” between 2017 and 2020.

According to timeanddate.com, Zotov will propose this concept at the Asia Oceania Geosciences Society. It is yet to be peer-reviewed.

In everyday life, the Earth wobbles barely alter. However, they must be monitored in order for the atomic clock to stay accurate enough to properly synchronise GPS and earth-observing satellites.