Select the correct pair relating a cell organelle with its primary function.

Select the wrong statements

I. Primary and secondary phloem gets crushed during secondary growth

II. During secondary growth, primary xylem remains more or less intact

In which type of plants is secondary growth most prominent?

Dendrochronology is used for determining the age of?

The age of tree can’t be determined by annual rings if the tree belongs to the

Growth rings are formed due to activity of

Exchange of gases between the outer atmosphere and internal tissue of the stem takes place by (in dicot stem)

Which of the following cell do not respire?

Which of the following is not a product of embryonic cells?

I. The 1° and 2° phloem get gradually crushed due to the continued formation and accumulation of 2° xylem

II. 1° xylem remains more or less intact in or near the centre

III. Secondary growth results in an increase in the length of the axis

Select the correct statements

I. Annual rigs are formed as a result of seasonal environmental conditions

II. Tracheids/vessels elements are larger during periods when water is abundant

III. Tracheids/vessels elements have thicker wall during periods of water deprivation

IV. Wood formed in the previous years is darker than newer wood

Select the combination of correct statements from the options given below