In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order:

Which of the following plants are used as green manure in crop fields and in sandy soils
1. Crotolariajuncea and Alhagicamelorum
2. Calotropisprocera and Phyllanthusnintri
3. Saccharummunja and Lantana camara
4. Dichanthiumannulatum and Azollanilotica

What is the arrangement of various regions starting from root tip?

Sweet potato is homologous to:

Roots play insignificant role in absorption of water in: 
1. Pistia
2. Pea
3. Wheat
4. Sunflower

Root hairs develop from the region of:
1. Maturation
2. Elongation
3. Root cap
4. Meristematic activity

Sweet potato is a modified
1. Stem
2. Rhizome
3. Tap root
4. Adventitious root

Eye of Potato is
1. Apical bud
2. Axillary bud
3. Accessory bud
4. Adventitious bud

Which one of the following is correctly matched
1. Onion - Bulb
2. Ginger - Sucker
3. Chlamydomonas - Conidia
4. Yeast – Zoospores

An example of edible underground stem is
1. Carrot
2. Groundnut
3. Sweet potato
4. Potato