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NCERT Class 6 Science Chapter 12 Beyond Earth
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Beyond Earth
Chapter: 12
| Let us enhance our learning |
1. Match the column:
| Column I | Column II |
| (i) Satellite of Earth | (a) Orion |
| (ii) Red planet | (b) Venus |
| (ii) Constellation | (c) Mars |
| (iv) Planet which is commonly called an evening star | (d) Moon |
Ans:
| Column I | Column II |
| (i) Satellite of Earth | (d) Moon |
| (ii) Red planet | (c) Mars |
| (iii) Constellation | (a) Orion |
| (iv) Planet which is commonly called an evening star | (b) Venus |
2. (i) Solve the following riddle.
My first alphabet is in MAN but not in CAN.
My second alphabet is in ACE and also in FAN.
My third alphabet is in RAT and not in CAT.
My fourth alphabet is in SUN but not in FUN.
I am a planet that moves around the Sun.
Ans: My first alphabet is in MAN but not in CAN: M.
My second alphabet is in ACE and also in FAN: A.
My third alphabet is in RAT and not in CAT: R.
My fourth alphabet is in SUN but not in FUN: S.
MARS (the Red Planet that moves around the Sun).
(ii) Make two similar riddles by yourself.
Ans: (i) My first alphabet is in MAN but not in CAN. (M)
My second alphabet is in ROSE and also in BOAT. (O)
My third alphabet is in OIL and not in LIME. (O)
My fourth alphabet is in SUN but not in SON. (N) (The answer to this riddle is “MOON”)
(ii) I am the largest planet in the Solar System.
My first alphabet is in JAM but not in LAMB. (J)
My second alphabet is in UP but not in CUP. (U)
My third alphabet is in PEN and also in DEN. (P)
My fourth alphabet is in ICE but not in NICE. (I)
My fifth alphabet is in RAT but not in CAT. (R)
My sixth alphabet is in TEN but not in PEN. (T)
My seventh alphabet is in EAR but not in TEAR. (E)
Who am I? (The answer to this riddle is “JUPITER”)
3. Which of the following is not a member of our Solar System?
(i) Sirius.
(ii) Comets.
(iii) Asteroids.
(iv) Pluto.
Ans: (i) Sirius.
4. Which of the following is not a planet of the Sun?
(i) Jupiter.
(ii) Pluto.
(iii) Neptune.
(iv) Saturn.
Ans: (ii) Pluto.
5. Which is the brighter star, the Pole Star or Sirius?
Ans: Sirius is the brighter star. It is the brightest star in the night sky, while the Pole Star (Polaris) is not as bright as Sirius.
6. An artist’s representation of the Solar System is given in Fig. 12.12. Is the order of the planets correct? If not, write the correct order in the boxes in the figure.
.
Ans: The order of the planets in the figure may not be correct.
Thus, the correct order from the Sun is:
(i) Mercury.
(ii) Venus.
(iii) Earth.
(iv) Mars.
(v) Jupiter.
(vi) Saturn.
(vii) Uranus.
(viii) Neptune.
7. A portion of night sky with stars is shown in Fig. 12.13. Look carefully and identify the groups of stars that form the patterns-the Big Dipper and the Little Dipper. Draw lines to connect the stars for these patterns and label them. Also, identify and label the Pole Star. You may refer to Fig. 12.4 for help.
Ans:
Big Dipper:
(i) Alkaid.
(ii) Mizar.
(iii) Alioth.
(iv) Megrez.
(v) Phecda.
(vi) Dubhe.
(vii) Merak.
Little Dipper:
(i) Polaris (Pole Star).
(ii) Kochab.
(iii) Pherkad.
(iv) Gamma.
(v) Delta.
(vi) Epsilon.
(vii) Zeta.
8. A portion of the night sky is shown in Fig. 12.14. Draw lines to connect the stars for Orion and label the star Sirius. You may refer to Fig. 12.3.
Ans:
The picture shows the Orion constellation and the star Sirius. The stars are connected with lines and labelled.
Orion Constellation (blue and cyan for the belt):
(i) Betelgeuse.
(ii) Bellatrix.
(iii) Alnilam.
(iv) Mintaka.
(v) Saiph.
(vi) Rigel.
(vii) Alnitak (part of Orion’s blt).
(viii) Sirius (red).
9. You can see stars fading away at dawn and appearing at dusk. During the day we do not see the stars. Explain why.
Ans: Stars fade away at dawn and become visible again at dusk due to the Earth’s rotation. During the day, the Sun’s light scatters in Earth’s atmosphere, making the sky bright and obscuring the light from other stars. As the Sun sets, the sky darkens, allowing the light from the stars to become visible again. Thus, stars are not seen during the day because the Sun’s light overwhelms their faint light.
10. During a clear night, try to observe the Big Dipper 3-4 times at an interval of 2 to 3 hours. Also try to locate the Pole Star each time. Does the Big Dipper appear to move? Draw a rough sketch to illustrate this, mentioning the time in each case.
Ans: The Big Dipper appears to move around the Pole Star due to the rotation of the Earth. The sketch would show the Big Dipper at different positions in the sky at different times, indicating its apparent movement around the Pole Star.
11. Think about the night sky and write a poem or a story on it.
Ans: The moon hums a lullaby sweet,
As stars shine bright, a sparkling fleet.
Clouds drift by like silent dreams,
Floating soft on silver beams.
The sky’s a book of tales untold,
Of galaxies and comets bold.
Planets spinning, far and free,
A universe of mystery.
Oh, night sky, so vast and true,
Holding magic in your hue.
Watch over us till dawn is near,
With twinkling lights so bright and clear.
