The inner lining of the stomach is protected from hydrochloric acid by which of the following? Choose the correct one.

In each of the following situations,what happens to the rate of photosynthesis?
$(a)$ Cloudy days
$(b)$ No rainfall in the area
$(c)$ Good manuring in the area
$(d)$ Stomata get blocked due to dust

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

Why is the rate of breathing in aquatic organisms much faster than that seen in terrestrial organisms?

Define transpiration. State its two functions.

$(a)$ Bile does not contain any digestive enzyme,yet it is important for the digestion of food. Why?
$(b)$ Name the products formed after the complete digestion of carbohydrates,proteins,and fats in the small intestine.