Distinguish between Spike and Raceme

Answer 1

Spike and raceme are two types of inflorescences found in plants. The main difference between them is the arrangement of flowers along the stem.

1. Spike: A spike inflorescence is a type of flowering structure where flowers are arranged along a single stem. The flowers are sessile, which means they are directly attached to the stem without any stalk. Spikes are usually unbranched and have flowers that are closely spaced without any apparent leaf-like structures between them. Examples of plants with spike inflorescences include wheat, barley, and rye.

2. Raceme: A raceme inflorescence is also a type of flowering structure where flowers are arranged along a single stem. However, unlike a spike, the flowers in a raceme have short stalks or pedicels that allow them to spread out along the stem and give the inflorescence a more open appearance. The flowers in a raceme are usually arranged in a single row along the stem and are often accompanied by small leaf-like structures called bracts. Examples of plants with raceme inflorescences include grapes, lupines, and sweet peas.