1. What is germination? Give one example.
2. Name three natural agents which help in the dispersal of seeds.
3. Name main parts of a seed.
4. What special features help
water animals to swim?
5. Why do birds and animals migrate?
Answers
Answer:
1)Germination is the process by which an organism grows from a seed or similar structure. The term is applied to the sprouting of a seedling from a seed of an angiosperm or gymnosperm, the growth of a sporeling from a spore, such as the spores of Fungus, ferns, bacteria, and the growth of the pollen tube from the pollen grain of a seed plant.
2)Wind ,water and animals help in dispersal of seeds.
3)The three primary parts of a seed are the embryo, endosperm, and seed coat. The embryo is the young multicellular organism before it emerges from the seed. The endosperm is a source of stored food, consisting primarily of starches.
4)They have gills to breathe, they have special wings to swim forward, their tail. These features lead them to swim in water. Heya, Mostly sea animals have gills to breathe.
5)Reasons to Move
Some animals travel relatively short distances to find food or more favorable living or breeding conditions. Most animals that migrate do so to find food or more livable conditions. Some animals migrate to breed. The Atlantic Salmon begins its life in a river and migrates downstream to the ocean.
Explanation:
When seed is germinated, you can see two different types of germination. Let's think about pumpkin. When a pumpkin seed is germinated, first, the radicle will come out from embryo of seed, and then cotyledon will come out. After the pumpkin seed is fully germinated, the cotyledon will emerge from the ground
Wind : You must have seen light seeds of calotropis flying in the air here and there , we used to call them boodhi ke bal( old womans hair bunch )in childhood .they fly away to a few hundred metres or more and settle some where and may germinate during the rainy season .
Water : many hydrophytes and some plants on sea shore like Coconut when it falls in the sea it flows to hundreds of miles and may sometimes reach another sea shore before germination , thus it may move from one continent to another.
Animals : some seeds have thorns or spines on them like zygophylous they stick to animal skins and are unintentionally carried by them , even they stick to human garments and are carried from one place to another where we notice them on our clothes and throw them away , if they fall on suitable substratum they germinate and grow there.
Fruit of Peepal, Banyan and fig are eaten by the birds and the seeds pass through their alimentary canal and when they defecate on a wall etc they germinate and grow , you must have quite often seen them on walls or roof tops .
The three primary parts of a seed are the embryo, endosperm, and seed coat. The embryo is the young multicellular organism before it emerges from the seed. The endosperm is a source of stored food, consisting primarily of starches.
They have gills to breathe, they have special wings to swim forward, their tail. These features lead them to swim in water. Heya, Mostly sea animals have gills to breathe.
Some animals travel relatively short distances to find food or more favorable living or breeding conditions. Most animals that migrate do so to find food or more livable conditions. Some animals migrate to breed. The Atlantic Salmon begins its life in a river and migrates downstream to the ocean.