LIFE SCIENCE

Detailed explanation-1: -Just as in roots, primary growth in stems is a result of rapidly dividing cells in the apical meristems at the shoot tip. Subsequent cell elongation then leads to primary growth.

Detailed explanation-2: -Examples of primary growth are the rapid lengthening growth of seedlings after they emerge from the soil and the penetration of roots deep into the soil. Furthermore, all plant organs arise ultimately from cell divisions in the apical meristems, followed by cell expansion and differentiation.

Detailed explanation-3: -In plants, primary growth occurs at the apical meristem. The apical meristem is found within the root tips and the tips of the new shoots and leaves.

Detailed explanation-4: -Lateral meristem is a type of meristematic tissue that is responsible for the secondary growth and development of some plants. The increase in stem thickness is a type of secondary growth that is contributed by the activity of the lateral meristems.