$A$ few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

List in tabular form,three differences between arteries and veins.

Explain the three pathways of breakdown of glucose in living organisms.

“All plants give out oxygen during day and carbon dioxide during night”. Do you agree with this statement? Give reason.

State whether the following statement is true or false: 'Reptiles have a three-chambered heart,mammals have a four-chambered heart,and fishes have a two-chambered heart.'

$(a)$ State the reason for the following:
$(i)$ Herbivores need a longer small intestine,while carnivores have a shorter small intestine.
$(ii)$ The lungs in human beings are designed to maximize the area for the exchange of gases.
$(b)$ The rate of breathing in aquatic organisms is much faster than that seen in terrestrial organisms.