6 Stages of Plant life Cycle in Detail and with Diagram

The plants are the important components of this living ecosystem. Their life cycle starts with the falling of seeds on the ground, dispersed by some pollinating agents.

The 6 stages of the plant life cycle

Generally, the life cycle of the plant is a simple one with fewer complications.

There are various plant life cycles, but the more advanced and mainly studied one is –the angiosperms (flowering plant) life cycle.

The stages of the plant life cycle

Seed stage

• This is the first stage of the life cycle in plants.

• The seed contains a miniature plant inside it in the form of an embryo.

• In angiosperms, the cotyledons are also found, which provide nourishment to the growing embryo inside the seed.

• The seed gets dispersed by various agents to distant soil where the development occurs.

• Cotyledons emerge as the first leaves after the germination of the seed.

• The seed coat is the additional coverage that protects against the harsh conditions of the environment.

Germination

• As the seed falls on the ground, the seed needs a suitable temperature and moisture to start the germination process.

• After the seeds are planted in the soil, under suitable conditions, the seed starts absorbing moisture and water, resulting in the swelling of the seed.

• This swelling leads to the rupture of the seed coat, and the hypocotyl emerges from the seed to transform into the stem.

• This proliferation of a little stem-like structure from the seed is called germination.

• In monocots, the seed coat does not rupture and is fixed in one place.

• The hypocotyl originates from one specific point in the monocots.

• After this, the tiny root also grows downwards into the soil.

• This root helps absorb water and other nutrients for the growth and development of the plant.

• After this, the last stage of germination witnesses the shredding of cotyledons, which culminates in the formation of the new leaves.

Vegetative Growth stage

• In order to sustain the various developmental changes in its body, the plant produces food.

• This food is produced by the process of photosynthesis and is essential to the growth of life.

• The process of photosynthesis occurs by adding carbon dioxide and water to form glucose and releasing oxygen.

• The chloroplasts in the leaf cells help in the process by trapping the sunlight. This light energy is used for the hydrolysis of water.

• The sugars that are produced by photosynthesis are stored in the roots and stems.

• The plant’s root system develops further and anchors the soil firmly to give the proper support to the plant.

• The meristem tissue in the leaf divides and proliferates into new leaves.

• After a while, the adult plant gives out the flowers on the stem, which marks the next stage in the life cycle of plants.

Flowering stage

• This is the stage where the plant matures and produces flowers.

• A flower is a sexual reproductive organ in a mature plant. A complete flower forms within the early bud on the stem.

• The petals of the flower are colored to attract the pollinating agents.

• The female part of the flower is called the pistil, which includes the stigma, style, ovary, and ovules.

• The male part is called the stamen, which consists of a long filament on which the Anther, where the pollen is produced and mature.

Pollination and fertilization stage (Reproductive stage)

• Pollination is a stage where the plants release pollen grains to reach the female part of the flowers.

• Some of the flowers may contain only the male or the female parts and not both.

• In such a case, the pollen is carried away from one flower to another with the help of the pollinating agents.

• This results in the pollen distribution onto the female part’s stigma.

• The pollinating agents are mainly the wind, water, birds, or some insects like honeybees.

• These pollinators play an essential role in producing new species of plants.

• Even when the flower is bisexual, the plant benefits from the other flower’s pollen.

• The pollen is disbursed onto the stigma of the female part, where the pollen gets attached to its base.

• As the pollen gets trapped, it traverses the style to the ovary.

Fruit and seed developement

• The ova in the ovary get fertilized with the pollen.

• The fertilized eggs take the form of an embryo and develop into a seed.

• But the ovary develops into a fruit by shedding the flower components like petals.

Seed Dispersal Stage

• Seed dispersal is the final stage of the plant’s life cycle.

• The seeds separate from the parent plant and are spread in the environment by wind, animals, or the water current.

• The seeds get dispersed to distant positions where they eventually start the plant’s life cycle in new soil.

• This ensures the survival of the species without competition with the parent plant.

Frequently asked questions and answers.

References:

• Plant Life Cycles by Julie Lundgren
• Parts of a flower