Question

Write simple and short answers.

{1 } What is germination of seed?
{2} Name the conditions necessary for germination.
{3} What is meant by dispersal of seed?
{4} Name the different parts of a seed.
{5} What are the different agents of dispersal?

Note:Write it honestly cause these are very small and easy Question☺.Only answer correct and Keep smile on your face ☺​

Answer 1

Answer:

Plants are fixed to the ground. They cannot move from place to place. If all the seeds of a plant fall and germinate near it, they will not get favourable conditions for growth. Therefore, it is necessary for them to get scattered and grow away from the parent plant. The scattering of seed for growing away from their parent plant is called dispersal of a seed.

There are some natural agents that help in scattering the seeds away from the parent plant. These are wind, water, animals and by the explosion of fruits. Some seeds and fruits develop a special structure that helps them in dispersal.

1. Wind

Seeds that are small in size and light in weight are dispersed by wind. Cotton, Madar, and dandelion seeds are dispersed by wind. They have fine, long hair around them. So, they are easily carried away by the wind.

SeedSeed dispersal by wind (Source: Shutterstock)

2. Water

Seeds of plants growing in water or near water bodies are dispersed by water. These seeds are light in weight and are able to float in water. The spongy fruit of lotus and fibrous outer covering of coconut make them light. This helps a seed float on water and move long distances.

SeedDispersal by water (Source: Shutterstock)

3. Animals

Many fruits and seeds are spread by animals, birds, and humans. Humans and animals eat fruits and throw away their seeds. These grow into a new plant. Squirrels collect nuts and bury them. When the conditions become favourable, these nuts grow into new plants.

Birds eat fruits sometimes the seeds come out in their droppings undigested. Some seeds get stuck to their beaks while eating fruits. When they rub their beaks, the seeds fall down and later on grow into new plants.