Meiosis can be seen in:

The correct answer is Option (1) → Anther

Meiosis is the cell division that halves the chromosome number. It takes place only where spores or gametes are formed. In the anther, each cell of the sporogenous tissue is a pollen mother cell. It divides by meiosis and forms a tetrad of four haploid microspores. This process is called microsporogenesis.

(1) Anther — Correct. Pollen mother cells in the anther divide by meiosis.

(2) Root tip — Incorrect. Cells at the root tip divide by mitosis to make the root grow longer.

(3) Shoot tip — Incorrect. The shoot tip also grows by mitosis, not meiosis.

(4) Meristematic tissue — Incorrect. Meristems are growing tissues. Their cells keep dividing by mitosis.

NCERT Extract:
Stamen, Microsporangium and Pollen Grain – “… Microsporogenesis : As the anther develops, the cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads.”
Stamen, Microsporangium and Pollen Grain – “… The process of formation of microspores from a pollen mother cell (PMC) through meiosis is called microsporogenesis. The microspores, as they are formed, are arranged in a cluster of four cells–the microspore tetrad (Figure 1.3a).”