If you build a campfire, you start with a large stack of sticks and logs. As the fire burns, the stack slowly shrinks. By the end of the evening, all that is left is a small pile of ashes. What happened to the matter that you started with? Was it destroyed by the flames? It may seem that way. What do you think happened? The truth is that the same amount of matter still exists. The wood changed not only to ashes, but also to carbon dioxide, water vapor, and other gases. The gases floated off into the air, leaving behind just the ashes. Although matter was changed, it was not created or destroyed. Because the same amount of matter still exists, we can say that matter is conserved. You may wonder how it can be conserved if something is now missing? Assume you had measured the mass of the wood before you burned it. Assume you had also trapped the gases released by the burning wood and measured their mass and the mass of the ashes. What would you find? The ashes and gases combined have the same mass as the wood you started with. This example illustrates the law of conservation of mass.

Question: "Once a stack of sticks and logs is burnt what matter remains?"

OPTIONS:
- no
- yes

Answer: "Small pile of ashes"

Response: yes

Relying on an animal to come by is risky. A flower may have to wait a long time for the right animals to come by. What if one never passes close enough to the flower? Hoping the wind will blow is also risky for a plant. What if the wind does not blow? What if the blowing pollen does not land on another flower? The wind could even blow the pollen over the ocean where it is wasted. Giving free nectar is costly. It is not a good use of the plants energy. A plant uses a lot of energy to produce nectar. Some animals may just drink the nectar. They may not carry off any pollen in return. To improve their chances, plants evolved special traits. For example, they developed ways to hide their nectar. Only certain animals were able to get at the plants hidden nectar. These specific animals might be more likely to visit only flowers of the same species. This was also a benefit for some animals. Animals also evolved special traits to get to the nectar.

Question: "What is the purpose of hidden nectar?"

Response: "To spread pollen"
OPTIONS:
- no
- yes

A: no

Problem: The center of an atom is held together by powerful forces. This gives them a huge amount of stored energy. This type of energy is called nuclear energy. This energy can be released and used to do work. This happens in nuclear power plants where they split apart the nucleus of an atom. This splitting apart is called nuclear fission. Another type of nuclear energy happens in the Sun. Here the atoms nuclei are not split apart. Instead, the nuclei of the atoms are fused, or joined together. This process is called nuclear fusion. Some of the suns energy travels to Earth. This energy from nuclear fusion warms the planet and provides the energy for photosynthesis.

Question: "What is the process to produce nuclear energy in nuclear powerplants called?"

Answer: "Nuclear fission"

OPTIONS:
- no
- yes
Answer: yes

Question:
The protagonist Preetam ( ( ( Ganesh , on a visit to Eva Mall amidst a heavy wind , spots a pretty girl , Nandini . While staring at her , he inadvertently falls into a manhole . Nandini rescues him from the pit , but in the process loses her heart-shaped watch she had just bought . While accompanying his mother to Madikeri , Preetam confronts a man named Jaanu . Jaanu , who has been following Nandini , beats up Preetam thinking that he is in love with Nandini . Preetam , unaware that Jaanu has vowed not to allow any one near Nandini , trashes Jaanu and his gang in return . In Madikeri , Preetam meets Nandini unexpectedly . He identifies himself and expresses his love towards her and offers to tie the watch as an indication for their marriage . Nandini , who is already engaged rejects his request . Still , Preetam vows to marry Nandini if she meets him again . In the meantime , Preetam discovers that his host in Madikeri , Col. Subbayya is Nandini's father , who is pretty much deaf , and Nandini's marriage is a just a week away . Dejected , Preetam throws Nandini's heart-shaped watch away . But Nandini calls him over the phone and taunts him to return . Delighted , Preetam goes in search of her watch and brings it back . While searching it , he spots a rabbit , Which he calls Devadas , and brings it along with him . Since Nandini's friends are due to arrive from Mumbai for the marriage , Preetam takes Nandini to the railway station . The train from Mumbai is delayed by five hours , so Nandini and Preetam decide to visit a nearby hill-temple . After reading the above, is "He was angry" the correct answer to the question "Why did Preetam throw away Nandini's watch and what did she do in return?"? OPTIONS:
- no
- yes

Answer:
yes

Befitting a lush, tropical island stranded in the middle of the ocean, Madeira's origins are shrouded in mystery and fanciful legend. Some claim that the archipelago is what remains of Plato's lost Atlantis, or part of a landmass that once fused the continents of Europe and America. The Portuguese Step Ashore: Recorded history of the volcanic archipelago begins in relatively recent times: 1418, just as the golden age of Portuguese discovery was erupting. Under the leadership of Henry the Navigator, caravels set out from the westernmost point of the Algarve, in southern Portugal, in search of foreign lands, fame, and wealth. Joao Goncalves Zarco, sailing in the service of Prince Henry, made the first of many famous Portuguese discoveries, which would culminate a century later in Magellan's historic circumnavigation of the globe. Zarco happened upon a small volcanic archipelago 1,000 km from Lisbon. Perhaps Zarco knew precisely where he was heading, having learned of the existence of Madeira from a Castilian source. After all, the waters of the Canary Islands, only 445 km (275 miles) to the south, had occupied busy shipping lanes for very nearly a century, and Genovese maps from the mid-14th century depict both Madeira and Porto Santo. More likely, Zarco was heading for Guinea and storms forced him onto the beach of Porto Santo. If so, then he was extremely fortunate, for he managed to land on the only large, sandy beach for hundreds of miles around. Little wonder he subsequently named it Porto Santo (Holy Port). The following year Zarco returned to claim the larger island he had seen from Porto Santo, and with him went Tristao Vaz Teixeira and Bartolomeu Perestrelo. They officially became the first men to set foot on the heavily forested island, naming it Ilha da Madeira, "Island of Timber. " The Portuguese Crown, delighted with its first important discovery, immediately embarked on a program of colonization. Zarco and Teixeira were appointed co-governors of Madeira, while Perestrelo was awarded Porto Santo.

Question: "How might Zarco have known of the location of the volcanic archipelago before he landed on it?"

OPTIONS:
- no
- yes

Answer: "He may have learned about it from Plato"

Response:
no