Plant Morphology

Step 1: Understand stem and root modifications for storage
Stem modifications for storage include tubers (e.g., potato), rhizomes (e.g., ginger), bulbs, and corms.
Root modifications for storage include tuberous roots and fleshy roots (e.g., carrot, sweet potato).
Step 2: Identify stem and root modifications in each pair
(1) Carrot, Turnip: Both are root modifications (tuberous roots), no stem modification.
(2) Potato, Ginger: Both are stem modifications (potato is stem tuber, ginger is rhizome), no root modification.
(3) Sweet potato, Colocasia: Sweet potato has tuberous root (root modification) and Colocasia has corm (stem modification).
(4) Sweet potato, Potato: Sweet potato (root modification), Potato (stem modification).
Step 3: Check which pair has both stem and root modifications
Pair (3) and (4) show both stem and root modifications.
However, Colocasia's storage organ is a corm (a modified stem), making (3) the best example of both types.
Sweet potato and Potato (4) also fit, but Colocasia is a clearer example of stem modification as a corm, while Potato is a tuber.
Conclusion: The pair Sweet potato and Colocasia shows both root and stem modifications for storage.

In biology, alternation of generations refers to a life cycle that includes both asexual and sexual phases, typically seen in plants, algae, and some fungi. This cycle involves the alternation between a multicellular diploid form (sporophyte) and a multicellular haploid form (gametophyte).

Funaria, a type of moss, exhibits this form of life cycle. In mosses, the dominant, leafy green plant is the gametophyte. It produces gametes that fuse to form a zygote, which grows into a sporophyte. The sporophyte, dependent on the gametophyte for nutrition, produces spores through meiosis. These spores then germinate to form new gametophytes, continuing the cycle.

The other organisms listed do not exhibit alternation of generations:

• Amoeba is a single-celled organism that reproduces primarily through binary fission, lacking a lifecycle with distinct multicellular stages.
• Hydra, a simple freshwater animal, reproduces asexually by budding and sexually, but does not exhibit a life cycle that includes distinct multicellular haploid and diploid stages.
• Plasmodium, the parasite causing malaria, has a complex lifecycle, but it does not consist of multicellular haploid and diploid stages as seen in classical alternation of generations