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    first, it must spot its prey, which typically includes zebras, gazelles and wildebeests ‘. which of the following options convey the meaning of spot as used in the line?

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    Study Reveals How Creatures Get Spots vs. Stripes

    Scientists have discovered how animals get their colorful coats, from fly dots to zebra stripes and leopard spots.

    Study Reveals How Creatures Get Spots vs. Stripes

    By Jeanna Bryner published April 07, 2010

    Scientists finally understand how the fruit fly Drosophila guttifera got its spots. (Image credit: Nicolas Gompel and Benjamin Prud'homme)

    The forest can be a blur of color and patterns, from the rosette spots on leopards and stripes adorning tigers to psychedelic butterflies and polka-dotted flies. Exactly how these animals got their funky coats has been a mystery ... until now.

    New research gets to the bottom of why certain fruit flies (Drosophila guttifera) are decorated with 16 spots on their wings, a finding that could apply to larger animals as well, the researchers say. The spot-stripe maker is a so-called morphogen, which is a protein that tells certain cells to make pigment.

    By inserting the gene linked to this morphogen into different parts of the fly's genome, the researchers created flies with wings covered in stripes rather than spots,.

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    "We can make custom flies," said Sean Carroll, a molecular biologist at the University of Wisconson-Madison, and the senior author of the report published this week in Nature.

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    While past studies have come up with theoretical answers to the pattern mystery, such as how leopards got their spots, this is the first study to show concrete evidence for a long-hypothesized system for generating animal color patterns.

    "For the prior six decades with respect to color pattering all sorts of schemes had been proposed but they aren't experimentally testable until you have actual molecules and knowledge of the development of the system," Carroll told LiveScience.

    Making spots

    Carroll and his colleagues solved the mystery through some detective deducing. They answered basic questions such as: Do we think all the spots are made by the same mechanism? When they found evidence that one protein was responsible for the spots, they tried to "guess," Carroll said, what that protein might be. Then he called up a couple of scientist friends, and they thought a molecule called "Wingless" could be the culprit.

    Here's how it works: The group discovered the color-inducing morphogen in embryonic tissue of the fruit flies, and found it was encoded by the Wingless gene. Late in wing development, the Wingless morphogen diffuses through tissue where it prompts cells in certain areas of the wing to make pigment.

    "The key thing is it's diffusing out from a source, so you have only a point source of Wingless, and when it diffuses out in all directions it can make a spot," Carroll said.

    In this species, the morphogen gets produced in proximity to existing physical landmarks such as the intersections of veins on the wing. The positioning of the spots is dictated by these pre-existing patterns.

    Polka dots and evolution

    The researchers say Wingless has been linked with pigmentation, or coat designs like zebra stripes, long before it popped up as a polka-dot maker for this fly species.

    "What's happened is that connection between Wingless and pigmentation has been exploited to make much fancier and obvious patterns," Carroll said. "Once there is a tool, in this case a little pathway, for making pigmentation, using that pathway in new places gives you new patterns. Just deploy the wingless molecule in the wing and get a fancier pattern."

    As with anything in evolution, the emergence of new body patterns takes time.

    "By tracking where this came from in other species, we can see how the complex pattern has evolved," Carroll said. "This isn't an overnight thing where there was a patternless wing and then, boom, you've got 16 spots."

    Carroll completed the research with his University of Wisconsin-Madison colleagues Thomas Werner, Shigeyuki Koshikawa and Thomas M. Williams.

    Amazing Animal Abilities

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    Jeanna Bryner

    Live Science Editor-in-Chief

    Jeanna is the editor-in-chief of Live Science. Previously, she was an assistant editor at Scholastic's Science World magazine. Jeanna has an English degree from Salisbury University, a master's degree in biogeochemistry and environmental sciences from the University of Maryland, and a graduate science journalism degree from New York University. She has worked as a biologist in Florida, where she monitored wetlands and did field surveys for endangered species. She also received an ocean sciences journalism fellowship from Woods Hole Oceanographic Institution.

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    स्रोत : www.livescience.com

    Discursive Passage with multiple choice Questions Vultures Passage

    unseen passage with mcq class 10 - MCQ based Discursive Passage Vultures Passage- Unseen passage with multiple choice questions

    Discursive Passage with multiple choice Questions Vultures Passage

    This unseen passage with multiple choice questions has been taken from the CBSE class 10 sample paper on student’s demand. But, it is based on the new MCQ pattern for class 10th syllabus by CBSE. It is 100% genuine. Essayshout is trying to bring more and more solved sample papers for class 10 English. CBSE sample paper 2021 has already been solved for you. Don’t forget to read our most viewed Analytical Paragraph Examples of Class X.

    DISCURSIVE PASSAGE WITH MULTIPLE CHOICE QUESTIONS VULTURES PASSAGE CLASS 10 | UNSEEN PASSAGE MCQ FOR CLASS 9-12

    Read the following passage given below –

    Evolution has designated vultures to be the ultimate scavengers. Enormous wingspans allow them to circle in the air for hours. Their beaks, while rather horrifying, are weak by bird standards, made to scoop and eat flesh. However unappealing they may seem, vultures serve an important role in the ecological cycle: processing the dead bodies of animals.

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    Only 20 years ago, India had plenty of vultures—flocks so enormous they darkened the skies. But by 1999, their numbers had dropped due to a mysterious kidney ailment. By 2008, 99.9 per cent of India’s vultures were gone. It was finally discovered that they had been killed by a drug called diclofenac (a pain reliever along the lines of aspirin or ibuprofen).

    Indians revere their cows, and when a cow showed signs of pain, they treated it with diclofenac. After the animal died, the vultures would eat the corpse. And though they boast perhaps the world’s most efficient digestive system, vultures cannot digest the drug.

    India banned the use of diclofenac for veterinary use in 2006, but it’s still widely used. The near-extinction of vultures has caused disease in the country, as rats and dogs moved in to take their place—spreading pathogens that would have otherwise been destroyed by the vultures.

    Vultures need large ranges to scan for food and undisturbed areas in which to nest. They also need an abundance of prey species since they rely more on chance than their own hunting skills to eat. All of these things have been reduced by human activity. Meanwhile, there is a dramatic increase in secondary poisoning. Vultures feed on carcasses laced with poison, intended to kill jackals or other predatory carnivores. Or they are poisoned by the lead in animals left behind by hunters.

    MCQ BASED UNSEEN PASSAGE FOR CLASS 10TH, 11TH, 12TH | VULTURES PASSAGE ANSWER KEY

    Answer the following multiple-choice questions (MCQ). Each question carries one mark.

    Q1 Vultures serve an important role in the ecological cycle as

    a. they eat less

    b. they process dead bodies of animals

    c. they help to maintain food webs

    d. they clear grounds with their wings

    ANS 1. b. they process dead bodies of animals

    Q2. Choose the best option that suits the central idea of the paragraph from the given quotes-

    (a) “It is not the strongest species that survive nor the most intelligent; but the one most responsive to change”. (Charles Darwin)

    (b) Death is nature’s way of saying, ” your table is ready”. (Robert Williams)

    (c) “Hunger is the best sauce in the world” (Miguel De Cervantes)

    (d) “Just remember that it is the bird that suffers and not the hunter”.(George W Bush)

    ANS 2. Option (a)

    Q3. Which of the following is apt about the writer in the following context- Meanwhile, there is a dramatic increase in secondary poisoning. Vultures feed on carcasses laced with poison, intended to kill jackals or other predatory carnivores. Or they are poisoned by the lead in animals left behind by hunters.

    negligent concerned caring patient worried Informative (a) 1 and 3 (b) 4 and 5 (c) 2 and 5 (d) 3 and 6 ANS 3. (c) 2 and 5

    Q 4. Which of the following is the most suitable title for the passage-

    (a) Mystery of vultures

    (b) Survival of the fittest

    (c) The Extinct Species

    (d) Bird standards

    ANS 4. (b) Survival of the fittest

    Q 5. The reason behind vultures dying is

    (a) they feed on carcasses laced with poison, intended to kill jackals or other predatory carnivores.

    (b) they are hunted

    (c) they do not get enough food

    (d) they are diseased

    ANS 5. (a) they feed on carcasses laced with poison, intended to kill jackals or other predatory carnivores.

    Q 6. What does the phrase ‘moved in to take their place’ mean in the passage?

    (a) contributed to the task

    (b) helped them (c) Replaced them (d) Removed them

    ANS. 6 (c) Replaced them

    Q7. Why are the vultures beak considered weak?

    (a) they are of no use

    (b) they are meant to scoop and eat flesh only

    (c) they are used to kill their prey

    (d) none of them

    ANS 7. (b) they are meant to scoop and eat flesh only

    Q 8. The author attempts to make the readers ______ through this write-up.

    (a) concerned (b) inspired (c) awakened (d) aware ANS 8. (d) aware

    Q 9. What is an interesting fact given in the passage about the vultures?

    स्रोत : essayshout.com

    Zebra Hides Among Huge Wildebeest Herd in Kenya

    It took the picture's photographer days to spot the zebra

    LIFESTYLE PETS

    There's a Zebra Hiding Amongst This Huge Herd of Wildebeest: Can You Spot it?

    There's a Zebra Hiding Amongst This Huge Herd of Wildebeest: Can You Spot it? It took the picture's photographer days to spot the zebra

    By Kelli Bender Published on August 20, 2018 04:13 PM

    Share Tweet Pin Email

    PHOTO: SWNS

    You think stark stripes would make you easy to spot, but one zebra has found a way to blend in and hide from predators.

    According to a press release, wildlife photographer Ingo Gerlach captured a sneaky zebra and didn’t even realize it until long after taking this shot.

    The photographer from Luxembourg was visiting Kenya’s Maasai Mara when he came upon a huge herd of wildebeest. Over the course of two hours, Gerlach took more than one hundred shots of the massive group, which likely held more than 1,000 wildebeests.

    Among these horned animals was one unique member. While looking over his numerous shots of the herd after he returned home, the photographer spotted a zebra rear hiding amongst all those brown behinds.

    SWNS

    If if took a trained eye days to spot it, it’s safe to say that this zebra found the perfect way to hide in plain sight.

    स्रोत : people.com

    Do you want to see answer or more ?
    Mohammed 11 day ago
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    Guys, does anyone know the answer?

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