"Cacti" by Ami Dave (2013)

Cacti are plants suited to the desert, and we must always keep this factor in mind when growing ornamental cacti in our gardens, for it helps us provide cacti with conditions that allow them to survive and thrive. For example, a cactus should never be watered over its body, as it will start to rot. This is because it is covered with a waxy coating which prevents water loss through evaporation. When one waters the cactus over its body, the waxy coating is washed away and the plant begins to rot. The amount of water that one must supply to the cactus is very much dependent upon the season and upon the climate of the place. During the summer season one should water cacti every four days, whereas in the rainy season, once every fifteen days is quite enough.

Cacti need a minimum of two and a half hours of sunlight per day; however, they should not be kept in the sun all day because they may wrinkle when exposed to too much bright sunlight. Unlike other plants, cacti produce carbon dioxide during the day and oxygen during the night, so they are ideal plants to be kept in bedrooms to freshen up the air at night.

If a cactus is to thrive and prosper, the size of the pot in which it is grown needs to be monitored carefully. The pot should always be a little smaller than the plant itself because it is only when the plant has to struggle to survive that it will thrive. If the pot is too spacious and the plant does not need to struggle, chances are that the cactus will die. Similarly, if a cactus shows no signs of growth, stop watering it. Watering should be resumed only when the plant begins to grow again.

The substrata of a cactus pot is ideally composed of pieces of broken bricks at the bottom, followed by a layer of charcoal above the bricks, and then coarse sand and pebbles above the charcoal. Leaf mould is the best manure.

Grafting cacti is very simple. A very small piece of the cactus plant should be stuck with tape to the plant that needs grafting. The smaller the piece, the easier it is to graft. To reproduce cacti, one has to simply cut off a piece of the cactus, allow it to dry for a few days, and then place it over the cacti substrate. It will automatically develop roots.

It is very easy to differentiate between cacti and other plants that look like cacti. All cacti have fine hair at the base of each thorn. The so-called “thorns” are in fact highly modified leaves which prevent loss of water through transpiration. If one ever gets pricked by cacti thorns, one should take tape, place it over the area where the thorns have penetrated the skin, and then peel it off. All of the thorns will get stuck to the tape and will be removed.

The purpose of this passage is to __________.

Adapted from The Story of Mankind by Hendrik Van Loon (1921)

Athens and Sparta were both Greek cities and their people spoke a common language. In every other respect they were different. Athens rose high from the plain. It was a city exposed to the fresh breezes from the sea, willing to look at the world with the eyes of a happy child. Sparta, on the other hand, was built at the bottom of a deep valley, and used the surrounding mountains as a barrier against foreign thought. Athens was a city of busy trade. Sparta was an armed camp where people were soldiers for the sake of being soldiers. The people of Athens loved to sit in the sun and discuss poetry or listen to the wise words of a philosopher. The Spartans, on the other hand, never wrote much that was considered literature, but they knew how to fight, they liked to fight, and they sacrificed all human emotions to their ideal of military preparedness.

No wonder that these sombre Spartans viewed the success of Athens with malicious hate. The energy which the defense of the common home had developed in Athens was now used for purposes of a more peaceful nature. The Acropolis was rebuilt and was made into a marble shrine to the goddess Athena. Pericles, the leader of the Athenian democracy, sent far and wide to find famous sculptors and painters and scientists to make the city more beautiful and the young Athenians more worthy of their home. At the same time he kept a watchful eye on Sparta and built high walls that connected Athens with the sea and made her the strongest fortress of that day.

An insignificant quarrel between two little Greek cities led to the final conflict. For thirty years, the war between Athens and Sparta continued. It ended in a terrible disaster for Athens.

During the third year of the war the plague had entered the city. More than half of the people and Pericles, the great leader, had been killed. The plague was followed by a period of bad and untrustworthy leadership. A brilliant young fellow by the name of Alcibiades had gained the favor of the popular assembly. He suggested a raid upon the Spartan colony of Syracuse in Sicily. An expedition was equipped and everything was ready. But Alcibiades got mixed up in a street brawl and was forced to flee. First he lost his ships and then he lost his army, and the few surviving Athenians were thrown into the stone-quarries of Syracuse, where they died from hunger and thirst.

The expedition had killed all the young men of Athens. The city was doomed. After a long siege, the town surrendered in April of the year 404. The high walls were demolished. The navy was taken away by the Spartans. Athens ceased to exist as the center of the great colonial empire that it had conquered during the days of its prosperity. But that wonderful desire to learn and to know and to investigate that had distinguished her free citizens during the days of greatness and prosperity did not perish with the walls and the ships. It continued to live. It became even more brilliant.

Athens no longer shaped the destinies of the land of Greece. But now, as the home of a great university, the city began to influence the minds of people far beyond the narrow frontiers of Hellas.

Which of these is not a consequence of the war between Athens and Sparta?

Adapted from A Catechism of Familiar Things: Their History and the Events Which Led to Their Discovery by the Benziger Brothers (1881)

The Aurora Borealis, or Northern Lights, is a luminous appearance in the northern parts of the sky, seen mostly during winter, or in frosty weather, and clear evenings; it assumes a variety of forms and hues, especially in the polar regions, where it appears in its perfection, and proves a great solace to the inhabitants amidst the gloom of their long winter's night, which lasts from one to six months.

What aspect of the Aurora Borealis does the author highlight in the underlined phrase “proves a great solace to the inhabitants amidst the gloom of their long winter's night, which lasts from one to six months”?

Adapted from The Fight at the Pass of Thermopylæ by Charlotte M. Yonge (1876)

The troops sent for this purpose were from different cities, and amounted to about 4,000 who were to keep the pass against two millions. The leader of them was Leonidas, who had newly become one of the two kings of Sparta, the city that above all in Greece trained its sons to be hardy soldiers, dreading death infinitely less than shame. Leonidas had already made up his mind that the expedition would probably be his death, perhaps because a prophecy had been given at the Temple at Delphi that Sparta should be saved by the death of one of her kings of the race of Hercules. He was allowed by law to take with him 300 men, and these he chose most carefully, not merely for their strength and valor, but selecting those who had sons, so that no family might be altogether destroyed. These Spartans, with their helots or slaves, made up his own share of the numbers, but all the army was under his generalship. It is even said that the 300 celebrated their own funeral rites before they set out lest they should be deprived of them by the enemy, since, as we have already seen, it was the Greek belief that the spirits of the dead found no rest till their obsequies had been performed. Such preparations did not daunt the spirits of Leonidas and his men, and his wife, Gorgo, not a woman to be faint-hearted or hold him back. Long before, when she was a very little girl, a word of hers had saved her father from listening to a traitorous message from the King of Persia; and every Spartan lady was bred up to be able to say to those she best loved that they must come home from battle "with the shield or carried upon it."

Why did Leonidas think he was going to die defending Sparta?

Adapted from Cassell’s Natural History by Francis Martin Duncan (1913)

The penguins are a group of birds inhabiting the southern ocean, for the most part passing their lives in the icy waters of the Antarctic seas. Like the ratitae, penguins have lost the power of flight, but the wings are modified into swimming organs and the birds lead an aquatic existence and are scarcely seen on land except in the breeding season. They are curious-looking creatures that appear to have no legs, as the limbs are encased in the skin of the body and the large flat feet are set so far back that the birds waddle along on land in an upright position in a very ridiculous manner, carrying their long narrow flippers held out as if they were arms. When swimming, penguins use their wings as paddles while the feet are used for steering.

Penguins are usually gregarious—in the sea, they swim together in schools, and on land, assemble in great numbers in their rookeries. They are very methodical in their ways, and on leaving the water, the birds always follow well-defined tracks leading to the rookeries, marching with much solemnity one behind the other in soldierly order.

The largest species of penguins are the king penguin and the emperor penguin, the former being found in Kerguelen Land, the Falklands, and other southern islands, and the latter in Victoria Land and on the pack ice of the Antarctic seas. As they are unaccustomed from the isolation of their haunts to being hunted and persecuted by man, emperor penguins are remarkably fearless, and Antarctic explorers invading their territory have found themselves objects of curiosity rather than fear to the strange birds who followed them about as if they were much astonished at their appearance.

The emperor penguin lays but a single egg and breeds during the intense cold and darkness of the Antarctic winter. To prevent contact with the frozen snow, the bird places its egg upon its flat webbed feet and crouches down upon it so that it is well covered with the feathers. In spite of this precaution, many eggs do not hatch and the mortality amongst the young chicks is very great.

Where do emperor penguins live?

Adapted from "Inhabitants of My Pool" by Arabella B. Buckley in Wonders of Earth, Sea, and Sky (1902, ed. Edward Singleton Holden)

The pool lies in a deep hollow among a group of rocks and boulders, close to the entrance of the cove, which can only be entered at low water; it does not measure more than two feet across, so that you can step over it, if you take care not to slip on the masses of green and brown seaweed growing over the rocks on its sides, as I have done many a time when collecting specimens for our saltwater aquarium. I find now the only way is to lie flat down on the rock, so that my hands and eyes are free to observe and handle, and then, bringing my eye down to the edge of the pool, to lift the seaweeds and let the sunlight enter into the chinks and crannies. In this way I can catch sight of many a small being either on the seaweed or the rocky ledges, and even creatures transparent as glass become visible by the thin outline gleaming in the sunlight. Then I pluck a piece of seaweed, or chip off a fragment of rock with a sharp-edged collecting knife, bringing away the specimen uninjured upon it, and place it carefully in its own separate bottle to be carried home alive and well.

Now though this little pool and I are old friends, I find new treasures in it almost every time I go, for it is almost as full of living things as the heavens are of stars, and the tide as it comes and goes brings many a mother there to find a safe home for her little ones, and many a waif and stray to seek shelter from the troubled life of the open ocean.

You will perhaps find it difficult to believe that in this rock-bound basin there can be millions of living creatures hidden away among the fine feathery weeds; yet so it is. Not that they are always the same. At one time it may be the home of myriads of infant crabs, not an eighth of an inch long, another of baby sea-urchins only visible to the naked eye as minute spots in the water, at another of young jelly-fish growing on their tiny stalks, and splitting off one by one as transparent bells to float away with the rising tide. Or it may be that the whelk has chosen this quiet nook to deposit her leathery eggs; or young barnacles, periwinkles, and limpets are growing up among the green and brown tangles, while the far-sailing velella and the stay-at-home sea-squirts, together with a variety of other sea-animals, find a nursery and shelter in their youth in this quiet harbor of rest.

And besides these casual visitors there are numberless creatures which have lived and multiplied there, ever since I first visited the pool. Tender red, olive-colored, and green seaweeds, stony corallines, and acorn-barnacles lining the floor, sea-anemones clinging to the sides, sponges tiny and many-colored hiding under the ledges, and limpets and mussels wedged in the cracks. These can be easily seen with the naked eye, but they are not the most numerous inhabitants; for these we must search with a magnifying glass, which will reveal to us wonderful fairy-forms, delicate crystal vases with tiny creatures in them whose transparent lashes make whirlpools in the water, living crystal bells so tiny that whole branches of them look only like a fringe of hair, jelly globes rising and falling in the water, patches of living jelly clinging to the rocky sides of the pool, and a hundred other forms, some so minute that you must examine the fine sand in which they lie under a powerful microscope before you can even guess that they are there.

Which of these statements is most clearly supported by the text?

Adapted from A Catechism of Familiar Things: Their History and the Events Which Led to Their Discovery by the Benziger Brothers (1881)

The Aurora Borealis, or Northern Lights, is a luminous appearance in the northern parts of the sky, seen mostly during winter, or in frosty weather, and clear evenings; it assumes a variety of forms and hues, especially in the polar regions, where it appears in its perfection, and proves a great solace to the inhabitants amidst the gloom of their long winter's night, which lasts from one to six months.

What aspect of the Aurora Borealis does the author highlight in the underlined phrase “proves a great solace to the inhabitants amidst the gloom of their long winter's night, which lasts from one to six months”?

Adapted from Cassell’s Natural History by Francis Martin Duncan (1913)

The penguins are a group of birds inhabiting the southern ocean, for the most part passing their lives in the icy waters of the Antarctic seas. Like the ratitae, penguins have lost the power of flight, but the wings are modified into swimming organs and the birds lead an aquatic existence and are scarcely seen on land except in the breeding season. They are curious-looking creatures that appear to have no legs, as the limbs are encased in the skin of the body and the large flat feet are set so far back that the birds waddle along on land in an upright position in a very ridiculous manner, carrying their long narrow flippers held out as if they were arms. When swimming, penguins use their wings as paddles while the feet are used for steering.

Penguins are usually gregarious—in the sea, they swim together in schools, and on land, assemble in great numbers in their rookeries. They are very methodical in their ways, and on leaving the water, the birds always follow well-defined tracks leading to the rookeries, marching with much solemnity one behind the other in soldierly order.

The largest species of penguins are the king penguin and the emperor penguin, the former being found in Kerguelen Land, the Falklands, and other southern islands, and the latter in Victoria Land and on the pack ice of the Antarctic seas. As they are unaccustomed from the isolation of their haunts to being hunted and persecuted by man, emperor penguins are remarkably fearless, and Antarctic explorers invading their territory have found themselves objects of curiosity rather than fear to the strange birds who followed them about as if they were much astonished at their appearance.

The emperor penguin lays but a single egg and breeds during the intense cold and darkness of the Antarctic winter. To prevent contact with the frozen snow, the bird places its egg upon its flat webbed feet and crouches down upon it so that it is well covered with the feathers. In spite of this precaution, many eggs do not hatch and the mortality amongst the young chicks is very great.

Where would you most expect to find this passage?

Adapted from The Story of Mankind by Hendrik Van Loon (1921)

Athens and Sparta were both Greek cities and their people spoke a common language. In every other respect they were different. Athens rose high from the plain. It was a city exposed to the fresh breezes from the sea, willing to look at the world with the eyes of a happy child. Sparta, on the other hand, was built at the bottom of a deep valley, and used the surrounding mountains as a barrier against foreign thought. Athens was a city of busy trade. Sparta was an armed camp where people were soldiers for the sake of being soldiers. The people of Athens loved to sit in the sun and discuss poetry or listen to the wise words of a philosopher. The Spartans, on the other hand, never wrote much that was considered literature, but they knew how to fight, they liked to fight, and they sacrificed all human emotions to their ideal of military preparedness.

No wonder that these sombre Spartans viewed the success of Athens with malicious hate. The energy which the defense of the common home had developed in Athens was now used for purposes of a more peaceful nature. The Acropolis was rebuilt and was made into a marble shrine to the goddess Athena. Pericles, the leader of the Athenian democracy, sent far and wide to find famous sculptors and painters and scientists to make the city more beautiful and the young Athenians more worthy of their home. At the same time he kept a watchful eye on Sparta and built high walls that connected Athens with the sea and made her the strongest fortress of that day.

An insignificant quarrel between two little Greek cities led to the final conflict. For thirty years, the war between Athens and Sparta continued. It ended in a terrible disaster for Athens.

During the third year of the war the plague had entered the city. More than half of the people and Pericles, the great leader, had been killed. The plague was followed by a period of bad and untrustworthy leadership. A brilliant young fellow by the name of Alcibiades had gained the favor of the popular assembly. He suggested a raid upon the Spartan colony of Syracuse in Sicily. An expedition was equipped and everything was ready. But Alcibiades got mixed up in a street brawl and was forced to flee. First he lost his ships and then he lost his army, and the few surviving Athenians were thrown into the stone-quarries of Syracuse, where they died from hunger and thirst.

The expedition had killed all the young men of Athens. The city was doomed. After a long siege, the town surrendered in April of the year 404. The high walls were demolished. The navy was taken away by the Spartans. Athens ceased to exist as the center of the great colonial empire that it had conquered during the days of its prosperity. But that wonderful desire to learn and to know and to investigate that had distinguished her free citizens during the days of greatness and prosperity did not perish with the walls and the ships. It continued to live. It became even more brilliant.

Athens no longer shaped the destinies of the land of Greece. But now, as the home of a great university, the city began to influence the minds of people far beyond the narrow frontiers of Hellas.

Which of these is not a consequence of the war between Athens and Sparta?

Adapted from Volume Four of The Natural History of Animals: The Animal Life of the World in Its Various Aspects and Relations by James Richard Ainsworth Davis (1903)

The examples of protective resemblance so far quoted are mostly permanent adaptations to one particular sort of surrounding. There are, however, numerous animals which possess the power of adjusting their color more or less rapidly so as to harmonize with a changing environment.

Some of the best known of these cases are found among those mammals and birds that inhabit countries more or less covered with snow during a part of the year. A good instance is afforded by the Irish or variable hare, which is chiefly found in Ireland and Scotland. In summer, this looks very much like an ordinary hare, though rather grayer in tint and smaller in size, but in winter it becomes white with the exception of the black tips to the ears. Investigations that have been made on the closely allied American hare seem to show that the phenomenon is due to the growth of new hairs of white hue.

The common stoat is subject to similar color change in the northern parts of its range. In summer it is of a bright reddish brown color with the exception of the under parts, which are yellowish white, and the end of the tail, which is black. But in winter, the entire coat, save only the tip of the tail, becomes white, and in that condition the animal is known as an ermine. A similar example is afforded by the weasel. The seasonal change in the vegetarian Irish hare is purely of protective character, but in such an actively carnivorous creature as a stoat or weasel, it is aggressive as well, rendering the animal inconspicuous to its prey.

A stoat might also be called __________.