7th - S.S.T (History): The Era of Regional Empires

7th - S.S.T (Civics): Democracy and Equality

7th-S.S.T (History): The Revelation of Medieval India

Class VII SCIENCE CHAPTER 1- CELL- THE BUILDING BLOCKS OF LIFE- EXTRA QUESTIONS.

1.            Name the type of cell in which nucleus is absent.

2.            What is the function of chloroplasts in plant cells?

3.            On which factor does size of an organism depends in eukaryotic organisms. Cell shape or number of cells and why?

4.            Why the nerve cells are branched in shape?

5.            What is the function of cell membrane in the cell?

6.            How can we say that a cell is capable of independent existence?

7.            What is tissue?

8.            Which of the following organisms have cell wall.

     (1)Bacteria         (2) Plants     (3) Amoeba (4) Human beings

9.            Name the cell organelles present in typical eukaryotic cells.

10.        How did the term 'cell' came into existence?

11.        Differentiate prokaryotic and eukaryotic cell.

12.       Write 2 functions of stem cells.

13.        Give reason: Many people store the stem cells of the new born child into banks.

14.        Differentiate red blood cells and nerve cells on the basis of

a) structure

b) function

15.        Fill in the blanks-

a) Size of the smallest cell is ____________________micrometer.

b) Largest cell measures around ___________________cm.

c) In multicellular organisms, there is ______________ of __________ among specialised cells.

d) ____________ and ______________ cells change their shape as per requirement of the organism.

the Bermuda's triangle

MYSTERY OF BERMUDA TRIANGLE

Q A.Why was the Guptas’ house buzzing with activity?

A)The Gupta’s house was buzzing with activity as they were off on a vacation and were doing last minute packing.

Q B. Why did Arnav ring the neighbour’s door bell thrice?

B)  Arnav rang the neighbour’s door bell thrice as he was very impatient.

Q C. What were the three explanations that Arnav offered for the mysterious disappearance of ships and planes in the Bermuda Triangle?

C) The three explanations that Arnav offered for the mysterious disappearance of ships and planes in the Bermuda Triangle were: 

·     Flight 19: One of the most famous disappearances was of Flight 19. On December5, 1945, five US Navy Avenger bombers disappeared mysteriously while on a routine training mission. The rescue plane that was sent to search for them did notmake it back either. Six aircraft and the entire crew vanished within a span of a few hours, without a trace.

·     Tudor Star Tiger: This aircraft disappeared in the Bermuda Triangle shortly before it was about to land at the Bermuda airport. This incident occurred in 1948.

·     Marine Sulphur Queen: This 524-foot carrier of molten sulphur started to sail on Feb 2, 1963 from Beaumont, Texas with a crew of 39. It was reported lost after two days.

Q D.What was the explanation given by Arnav’s mother for the Bermuda Triangle?

D)Arnav’s mother gave the following explanation for the Bermuda Triangle:

·     One is that of methane gas. If this natural gas, found deep under the ocean floor bubbles up while a ship is sailing in the ocean, it could sink the ship.

·      Rogue waves and violent weather could be another reason. The area within the Bermuda Triangle experiences high waves, which could sink a ship. The area is also prone to cyclones and hurricanes.

·      Some attribute the phenomenon to magnetic anomalies. Magnetic variations are common phenomena while flying or sailing. But sadly, these can lead to spatial disorientation. In simple words, this refers to losing sense of direction and location.

·      Human error is also one probable reason. No matter how experienced the captain of a ship or the pilot of a plane, mistakes do happen.

·      And Pirates too could be one of the reasons.

COMPREHENSION QUE/ANS

1.  What is the Bermuda Triangle?

The Bermuda Triangle an imaginary triangle in the Atlantic Ocean whose three corners extend from the island of Bermuda to Miami in Florida to San Juan in Puerto Rico.

2.  What has happened in this triangle over the last century? What is the other name of the Bermuda Triangle?

Many aircraft, ships, boats and yachts have mysteriously disappeared in this area without a trace. Devil’s Triangle is the other name of the Bermuda Triangle.

3.  Who was Christopher Columbus? Why did he set out into the Atlantic Ocean in 1492?

Christopher Columbus was the famous Italian explorer. He set out into the Atlantic Ocean in 1492 in hope of finding a new route to India.

4.  What did the legend say about the city of Atlantis?

The legend said that the city of Atlantis was dependent on some energy crystals which were very powerful and  radiated huge amounts of energy that caused navigational instruments to malfunction and led to the destruction of ships and planes.

The vagabond

The Vagabond

·    lave - refers to a flowing water body (river)

jolly - happy

by way – a minor road or path

nigh - near

blow – a stroke of misfortune.

afield – in the field

linger – loiter

frosty – very cold

haven – a place of safety or refugee

1.What does vagabond ask for in the first stanza of the poem?

The vagabond asks for the sky above, a bed in the bush, bread for food, and river water to drink.

2.Why does he want his bed in the bush?

So that he can see the stars.

3.Name three things he can do without.

The poet does not want wealth, love or hope.

4.What is the vagabond’s only interest in life?

Unlimited travel.

5.What does the vagabond not wish for?

 Wealth or love.

6.What is the only thing that he needs?

Freedom.

7.Choose the lines in the poem that shows us that the vagabond wants to completely avoid all human associations.

‘Nor a friend to know me, all I seek, the heaven above and the road below me’.

What does autumn signify?

Old age.

9.What kind of imagery does the vagabond evoke when he talks of his ideal life?

He evokes images of clear skies, starry nights, dipping bread in the river, a long lengthy unending road, autumn leaves falling, vast open fields covered with leaves in autumn and snow in winter, fireside in some lonesome hut.

10.Why do you think the poet repeats the lines, “All I seek, the heaven above/And the road below me’.

Here, the poet or the vagabond expresses his

earnest desire to lead a carefree life, untroubled and a happy – go –lucky life. He wants no material comforts. He only wants to live out in the open, in the company of nature.

11. What does the poet want from life?

The poet wants a life which is carefree and wandering. He wants to sleep on the grass and watch the open sky. He wants to eat only bread and drink water from the river.

12. What does the poet say about autumn and winter?

He speaks of harsh conditions in autumn and winter but says that it will not deter him in his yearning to be on the road.

13.Choose the correct word from the bracket and complete the following sentences.

near, wanderer, byway

1. He spent a few years as a _________ before settling in a city and getting a job in a factory.

2. Going to Cairo, we came __________ killing a steamboat which paid no attention to our whistle and then tried to cross our bows.

3. We took the __________ to avoid heavy traffic.

Class 7 Gujarati Textbook

Chapter 2 Heat and its Transfer work sheet

Science chapter 2