Question

Q 1. Read the following passage carefully and answer the questions that follow. (1X10= 10 Marks)

Why are catfish bad neighbors for Allis shad?

The Allis shad is a type of migratory fish. While they typically live in the ocean, they travel to rivers during the

spring months to lay eggs. Sadly, this journey can be deadly for many Allis shad. This is because humans fish for

them, they get blocked by dams, or the rivers are too polluted. And if these dangers weren‟t enough, a new

species called the European catfish likes to eat the Allis shad. We wanted to find out if catfish truly are a threat to

the already endangered Allis shad. To do this, we monitored a part of the Garonne (a large river in France) where

Allis shad like to lay their eggs, and then we studied catfish hunting behavior.

Adult Allis shad live in the northeastern Atlantic Ocean. However, to reproduce (lay eggs) they need other water

conditions – for example, fresh water instead of salt water like the ocean. Once in their lifetime, Allis shad

migrate to large rivers (mostly in France, Spain and Portugal) to lay their eggs. It is very dangerous for the Allis

shad to travel from the Atlantic Ocean to rivers. This is mostly due to humans. We have built dams that are hard

for fish to get past and we fish for sport or for food. Water conditions have changed due to climate change and

human activities, which can cause things like lower water levels and more pollution that, are harmful for many

animal species. For all these reasons, the Allis shad is an endangered species. There is also a big new threat to the

journey of the Allis shad. Not long ago, fishermen introduced the European catfish – a very large freshwater fish

(up to 2.7m/8.8ft) to the rivers where Allis shad lay eggs. It normally lived in the rivers of Eastern Europe, but

was introduced to; LLG Western Europe because humans wanted to catch bigger fish. This makes them by far the

largest predators in western European rivers. During their journey, Allis shad are usually protected from being

attacked by other fish because of their body size. Most predators are not large enough to eat them. This changed

with the introduction of the catfish because most catfish are big enough to eat Allis shad. Therefore, we took a

closer look at catfish and Allis shad in the Garonne River in France.

We used low-light cameras and audio recorders to monitor a river stretch in the Garonne. It is important to know

that in order to reproduce, at least one male and one female Allis shad need to swim side by side in a circle. By

doing this, they disturb the water surface with their tail, which creates a splashing noise. We recorded these noises

and counted the number of spawning acts during that time. Additionally, we recorded the number of spawning

acts that were interrupted by catfish. We also measured the number of catfish in the area and the content of their

stomachs. The smallest catfish that had Allis shad in their stomach measured 129cm/4ft long, so we assumed that

fish need to be over 128cm/4ft long to be able to eat Allis shad.

CHOOSE THE CORRECT OPTION:( 1x10=10)

1) Which is NOT a reason for the deadly journey of Allis shad?

a) They travel to rivers during the spring months to lay eggs

b) Humans fish for them, they get blocked by dams.

c) The rivers where they travel are too polluted.

d) Catfish threat them.

2) What do the scientists want to find out?

a) Why do Allis shad are endanger?

b) How they lay eggs?

c) Are catfish truly are a threat to Allis shad?

d) How do catfish hunt?

3) Allis shad travel

a) Because the rivers are polluted where they live

b) Because humans build dams

c) Because they need other water condition to reproduce

d) Humans hunt them

4) Catfish attack and eat Allis shad because

a) They are more dangerous than Allis shad

b) They are stronger than Allis shad

c) They are big enough to eat Allis shad

d) Allis shad are very tasty.

5) Most of Allis shad become the food of catfish. Is this….

a) True

b) False

6) The survival of catfish depends only on Allis shad

a) True

b) False

7) What did the scientists use to take a closer look at catfish and Allis shad?

a) High light cameras

b) Low light cameras

c) X – rays

d) Light –qualities cameras

8) What did scientists record?

a) Splashing noise

b) Spawning acts

c) Spawning acts disturbed by catfish

d) All of above

9) Why do catfish need to be long?

a) After that they are able to eat Allis shad

b) After that they can survive

c) After that they can become dangerous predators

d) After that they can survive in ocean

10) Allis shad are endangered. The major factor is …..

a) They lay eggs in Garonne river in factor

b) They are main food of catfish

c) Water condition changed due to human activities.

d) All of above​

PLEASE GIVE ANSWER TO ME
IT IS VERY IMPORTANT TO ME
I WILL MARK HIM AS BRAINLIEST

Answer 1

Answer:

1) They travel to rivers during the spring months to lay eggs

2)Are catfish truly are a threat to Allis shad?

3)Because they need other water condition to reproduce

4)They are big enough to eat Allis shad

5)True

6)false

7)

b) Low light cameras

8)a) Splashing noise

b) Spawning acts

c) Spawning acts disturbed by catfish

d) All of above

9)After that they can survive in ocean

10)They lay eggs in Garonne river in factor