Read the given passage and answer the questions from 1-5 based on it:
Get too close and, in the blink of an eye, the reclusive worms disappear into their tubes, which are burrowed into the coral, and slam shut little lids, operculum, behind them. Then it’s a wait of a minute or longer before the worms decide it’s safe to come back out.
Christmas tree worms can reach lengths of around 3.5 cm and most of their bodies remain hidden in their tubes. The festive parts sticking out are pairs of feathery spiral-shaped tentacles known as radioles, which they use for breathing and feeding.
Close relatives of Christmas tree worms, members of the same Sabellidae family, include the feather duster and peacock worms, which stick up in tubes from the seabed with a mop of radioles poking out. All of these sedentary worms begin life as minute mobile larvae.
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1. What are operculums?
a) little lids in coral tubes
b) tubes in which Christmas tree worms hide from their predators
c) are breathing holes in their bodies
d) are minute eye-sockets
Answer: a)
2. What is the shape of radioles?
a) oval
b) cylindrical
c) spiral
d) rectangular
Answer: c)
3. What is the first stage in the life of Christmas tree worms?
a) tubular worms
b) larva
c) coral
d) fly
Answer: b)
4. Which of these does not belong to the Sabellidae family?
a) peacock worms
b) feather duster
c) Christmas tree worms
d) all of these
Answer: d)
5. Radioles help in:
a) breathing
b) feeding
c) sleeping
d) both a and b
Answer: d)
Read the given passage and answer the questions from 6-10:
Although Amazon pink river dolphins are famous for its pink hue, they weren’t born this way. The dolphins are actually born grey and slowly turn pink as they age. Male dolphins are strikingly pinker than their female counterparts; the colouration is thought to be a product of scar tissue resulting from rough games or fighting over conquests. However, their final colour can be influenced by their behaviour, capillary placement, diet, and exposure to sunlight; with brighter pinks attracting more attention from the females. These river dolphins can sport markings that range from mostly grey with some pink spots, to full flamingo pink.
While dolphins have a reputation for gathering in groups, the pink river dolphin is often seen alone or in small groups of 2-4 individuals, usually mothers and young. Paradoxically, the good news is that despite living in small groups, Amazon pink river dolphins are incredibly curious and outgoing animals towards humans. They spend a lot of time underwater, and their shy, secretive and elusive behaviour adds to their mythical quality.
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6. What is not true about pink dolphins?
I. They are naturally born with a beautiful pink colour.
II. Male dolphins are strikingly pinker than the female ones.
III. They slowly turn grey as they age.
a) only I
b) only III
c) both I and III
d) I, II, III
Answer: c)
7. What is not true about pink dolphins?
I. They are very social.
II. They are very curious and human-friendly
III. They prefer to live in big groups.
a) only I
b) only II
c) II and III
d) I and III
Answer: d)
8. Which factor influences their skin colouration?
I. behaviour
II. capillary placement
III. exposure to sunlight
IV. diet
a) II and II
b) III and IV
c) I, II, IV
d) I, II, III and IV
Answer: d)
9. What is true about pink dolphins?
I. Bright pink male dolphins attract more females.
II. Pink dolphins can often be spotted alone.
III. They are found in the Amazon river.
a) only I
b) only II
c) only III
d) all of these
Answer: d)
10. Which of these is not a quality of dolphins?
a) shy
b) secretive
c) elusive behaviour
d) all of these
Answer: d)
