Leguminous plants are the members of the family fabaceae. Their fruits are mostly elongated beans which are known as pods . Leguminous plants have bacteria called Rhizobium in their roots. This bacteria forms a bead like structure in the roots of legumes which are known as root nodules. Leguminous plant have a symbiotic relationship with Rhizobium. Rhizobium converts the atmospheric nitrogen into soluble nitrites and nitrates and supply them to plant for protein synthesis. Some nitrites and nitrates can also b leeched into the soil and can b absorbed by other plants growing nearby. Hence leguminous plants replenish the nitrogen in the soil and can be good substitute for nitrogen fertilizers. Some common legumes are soyabean, peas, gram and all kinds of pulses.Plants which dont bear pods are non- leguminous plants.These plants dont have Rhizobium in their roots and hence deplete the soil instead of replenishing it with nitrogen like legumes. Rose, mango, Ficus, Margo etc are the examples of non leguminous plants.

Planets reflect light from their stars ....they don't emit light of their own ,so they are not luminous. Planets are illuminated objects ,which reflect light from other sources .No planet can be called luminous...!!

Introduction
Planets are celestial bodies that orbit around a star and do not produce their own light. They reflect the light that falls on them from the star they orbit, making them visible in the night sky. However, some planets are more luminous than others due to various factors such as their distance from the sun and their atmospheric composition. In this explanation, we will discuss the luminous and non-luminous planets in detail.

Luminous Planets
Luminous planets are those that appear brighter in the night sky due to their ability to reflect a significant amount of light. The two luminous planets in our solar system are:

1. Venus: Venus is often referred to as the "Evening Star" or the "Morning Star" because it is the brightest planet visible from Earth. This is primarily because Venus is the closest planet to Earth and its thick atmosphere reflects a large amount of sunlight. The reflective clouds surrounding Venus contribute to its luminosity, making it easily visible to the naked eye.

2. Jupiter: Jupiter is the largest planet in our solar system and is also highly luminous. Its immense size allows it to reflect a substantial amount of sunlight. Additionally, Jupiter's atmosphere contains various reflective gases, giving it a bright appearance in the night sky. Jupiter is often referred to as the "King of the Planets" due to its remarkable brightness.

Non-luminous Planets
Non-luminous planets are those that do not emit their own light and appear dimmer in the night sky compared to luminous planets. The non-luminous planets in our solar system are:

1. Mercury: Mercury is the closest planet to the sun and does not possess a dense atmosphere like Venus. As a result, it reflects only a small amount of sunlight, making it appear relatively dim in the night sky.

2. Mars: Mars is often referred to as the "Red Planet" due to its reddish appearance. However, despite its distinctive color, Mars is not as luminous as Venus or Jupiter. Its thin atmosphere and reddish surface absorb a significant amount of sunlight, resulting in a relatively dim appearance.

3. Saturn: Saturn is the second-largest planet in our solar system and is known for its prominent ring system. However, despite its remarkable size and beautiful rings, Saturn is not as luminous as Venus or Jupiter. Its reflective capacity is limited compared to these planets, resulting in a relatively faint appearance.

Conclusion
In summary, Venus and Jupiter are the most luminous planets in our solar system due to their proximity to Earth, large size, and reflective atmospheres. On the other hand, Mercury, Mars, and Saturn are non-luminous planets that appear dimmer in the night sky. The luminosity of a planet depends on factors such as its distance from the sun, atmospheric composition, and reflective capacity. Observing these planets can provide valuable insights into the characteristics and properties of celestial bodies in our solar system.