In an experiment demonstrating the evolution of oxygen in Hydrilla, sodium bicarbonate is added to water in the experimental set-up. What would happen if all other conditions are favourable?
Important Questions on Nutrition in Plants and Animals
(i) Water and some salts from undigested food are absorbed.
(ii) Food is liquefied; breakdown of proteins begins.
(iii) Food is moistened; breakdown of starch begins.
(iv) Proteins, carbohydrates, and fats break down; nutrients are majorly absorbed into the bloodstream.
Select the option that gives the correct order of these events as food passes through the human digestive tract.
Refer to the given diagram showing a part of the human alimentary canal and answer the following questions. Which of the labelled structures removes most water from the undigested food?
Which of the following statement(s) is/are correct for the structure labelled as Z?
The given diagram shows a destarched, variegated leaf, partly covered by black paper. The plant is placed in bright light for several hours.
Four discs are then cut from the leaf in the positions shown and are tested for starch. Which disc(s) do/does not contain starch?
Refer to the given graph which shows the effect of pH on the activities of three enzymes X, Y and Z.
Which of the following are the possible locations in the alimentary canal of man where the three enzymes can be found?
| X | Y | Z | |
| (A) |
Small |
Mouth | Stomach |
| (B) | Mouth | Stomach | Small intestine |
| (C) | Stomach | Small intestine |
Mouth |
| (D) | Stomach | Mouth | Small intestine |
