🎴 Flashcard Mode

• The onion plant has bluish-green leaves and its bulb at the base of the plant begins to swell when a certain day-length is reached. The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale leaves that envelop a central bud at the tip of the stem.
  
• Underground stems are modified plant structures that derive from stem tissue but exist under the soil surface. Turmeric is the rhizome or underground stem.
  
• In racemose inflorescence,  the growing region at the tip of the flower stalk continues to produce new flower buds during growth. As a result, the youngest flowers are at the top and the oldest flowers are at the base of the stalk. Mustard shows racemose inflorescence. Cyme inflorescence is present in Solanum. A Cyme is a group of flowers in which the end of each growing point produces a flower, so new growth comes from side shoots and the oldest flowers are at the top.
• Phylloclade is a flattened branch or stem-joint resembling and functioning as a leaf. Phylloclade is a stem modification for deserts like area in which the stem becomes broad and fattened (in Opuntia) or cylindrical (in euphorbia)

So, the correct answer is 'Racemose - Solanum'.