Question

A researcher in Chennai wants to study how much carbohydrate is burnt up in the body in a
long distance race. She measured the body weight of athletes before and after a 2 km race.
She found to her surprise that cach athlete lost I kg or more. The athletes could not have
burnt I kg carbohydrates in their bodies in a 2 km race, she thought.

Answer these questions.
1. What do you think the reduction in body weight was due to?
2. Do you think she had designed the experiment properly?​

Answer 1

A researcher in Chennai wants to study how much carbohydrate is burnt up in the body in a

long distance race. She measured the body weight of athletes before and after a 2 km race.

She found to her surprise that cach athlete lost I kg or more. The athletes could not have

burnt I kg carbohydrates in their bodies in a 2 km race, she thought.

Answer these questions.

1. What do you think the reduction in body weight was due to?

2. Do you think she had designed the experiment properly?

Answer 2

Explanation:

Question 1:

In plants, the same set of pipe-like vessels transport water, mineral salts and food. Do you agree? Give reasons.

ANSWER:

• No, the transportation of mineral salts, water and food is not done by same of vessels. The mineral salts and water are specifically transported by xylem vessels, which originate from the roots and extend to the tips of the leaves. Food, on the other hand, is transported by phloem vessels which extend from leaves to different parts of the plant.