Question

give examples of homologous organs in plants..??

Answer 1

Homology of Climbing Organs which are all Analogous to Tendrils:

Under this head one groups together all types of tendrils and studies the homology of each of them.

(1) Tendrils of Vitis are modified apical buds , i.e., homologous to them.

(2) Tendrils of Passiflora are homologous to axillary buds.

(3) Tendrils of Lathyrus aphaca  are homologous to whole leaves.

(4) Tendrils of Pisum sativum  are homologous to leaflets.

(5) Tendrils of Clematis are modified leaf petioles.

(6) Tendrils of Gloriosa are homologous to leaf apices.

(7) Tendrils of Smilax  are homologous to stipules.

Homology of Defensive Organs which are Analogous to Thorns and Spines:

Thorns and spines are different—the former being stronger structures. But all spines and thorns may be treated as analogous as they look similar and perform the same function.

(1) The thorns of Duranta, Bougainvillaea, Carissa , Flacourtia , Hygrophila, prune  and the bigger thorns of Ulex are all modified axillary buds or stems.

(2) The thorns of Aegle marmelos and of Citrus spp. (lemons and oranges) are possibly modified prophylls.

(3) The spines of Acacias  and Zizyphus  are stipules.

(4) The spines of Opuntia , Asparagus , Berberis  and the smaller thorns of Ulex  are all modified leaves.

(5) The spines of Trapa bispinosa (water-chestnut) are modified persistent sepals.

Answer 2

Homologus Organs in plants : Homologous organs are those organs which have the same basic structural design and origin but have different functions. Examples: The leaves of a pitcher plant, a Venus fly trap, a cactus and a poinsettia are all examples of homology.