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Which of the following are reasons for the chief fishing grounds being located in continental shelf areas where cold and warm currents meet?<br>I. Warm currents are rich in phosphates and nitrates<br>II. Plankton - the chief fish feed - thrives in these regions<br>III. The meeting of cold and warm currents allows the water to be well aerated<br>IV. The epicontinental seas allow sunlight to reach almost to the bottom

Correct Answer: II, III and IV
The reasons for the chief fishing grounds being located in continental shelf areas where cold and warm currents meet are Plankton - the chief fish feed - thrives in these regions, The meeting of cold and warm currents allows the water to be well aerated and The epicontinental seas allow sunlight to reach almost to the bottom.

Why are major fishing areas of the world confined to the temperate zone?
I. Cold and warm currents meet, creating conditions favourable for plankton growth
II. The fish of these waters are highly palatable as human food
III. There is a ready mark, in the land masses of the zone
IV. The existence of submarine plateaus help in growth of fish population

Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! The writer saw all of the following except:

Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and myfluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy ofcolourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They wereoblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide inamazement; the tube would fall off!
The writer is describing her experience of which activity?

Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! How to avoid the mask fogging up?

Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! What is 'Nemo'?

Read the passage carefully and choose the best answer to each question out of the four alternatives. The instructor's rules were simple. Breathe through your mouth, not your nose; else the mask will fog up. Easier said than done; I got it wrong many a time. But once you fought habit and got the hang of it, the panoramic underwater world revealed itself to you with high-definition clarity. Led by him, I slowly peered through the mask into what till then was crystal-clear water, shimmering in the sunlight. I saw pebbles, sand and my fluid shadow. I was in Nemo's universe. Sea cucumbers, sea anemone, clown fish, star fish, sea horses, parrot fish, butterfly fish and a bevy of colourful salt water fish swam past. A shoal of canary-yellow fish did a merry dance and another with vibrant blue fish followed it. They were oblivious to the snorkelers who struggled to take in the sight of a world so beautiful, so colourful, and resist opening their mouth wide in amazement; the tube would fall off! When would there be a risk of the tube falling off?

Consider the following statements :
1. Where fold mountains run parallel and close to the coast, continental shelf is narrow or absent
2. The average depth of continental shelf is 100 meters
3. Submarine canyons are mostly found in continental slope
4. The submarine flat topped mountains are called guyots.

A store has five shelves and average weekly sale is Tk. 30000. Shelf 1 accounted for 1/4 of the store's average weekly sales and shelves 2 and 3 each accounted for 2/3 as much as shelf 1. The shelf 4 alone accounted for as much as shelf 1, then which of the following could have been the average weekly sales of shelf 5 for the store?

Fishing grounds are concentrated in the high latitudes. The reasons are:
1. great length of indented coastline
2. extensive continental shelves
3. water temperatures lower than 20°C
4. sparse population

A man starts from point 'O', travels 20 km towards east to reach point 'A', turns right and travels 10 km to reach point 'B', turns right and travels 9 km to reach point 'C', turns right and travels 5 km to reach point 'D', turns left and travels 12 km to reach point 'E' and then turns right and travels 6 km to reach point 'F'. What is the shortest distance between point 'E' and point 'C'?