Why is the colour of blood red, though it has constituents of different colours?
Important Questions on Transportation of Materials in Plants and Animals
If vegetables such as brinjals or ladyfingers become somewhat dry and shrivelled, they are put in water. They start looking fresh again, because water enters inside them. In the absence of any opening, how does water enter the vegetables?
Xylem transports sap upwards only whereas phloem transports food in both directions. Why do you think there is a difference?
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 weights of athletes before and after a 2 km race. She found to her surprise that each athlete lost 1 kg or more. The athletes could not have burnt 1 kg carbohydrates in their bodies in a 2 km race, she thought.
Answer these questions.
What do you think the reduction in body weight was due to?
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 weights of athletes before and after a 2 km race. She found to her surprise that each athlete lost 1 kg or more. The athletes could not have burnt 1 kg carbohydrates in their bodies in a 2 km race, she thought.
Do you think she had designed the experiment properly?
