D. Answer these questions.
1. How are plants useful to us?
2. All seeds are not able to grow into new plants. Why?
3. What are the different parts of a seed?
4. What is germination?
5. What are the conditions necessary for germination?
6. What is seed dispersal?
7. Why must seeds be dispersed? What are the agents of dispersal?
8. What is agriculture?
Science
Answers
1. How are plants useful to us?
Plants are really important for the planet and for all living things. Plants absorb carbon dioxide and release oxygen from their leaves, which humans and other animals need to breathe. Living things need plants to live - they eat them and live in them. Plants help to clean water too.
2. All seeds are not able to grow into new plants. Why?
all the seeds of a plant fall under the parent plant, there will be shortage of space for the germination of the seeds. Even if they germinate, they cannot grow properly due to scarcity of food resources and also space. For all these reasons, seed dispersal is necessary.
3. What are the different parts of a seed?
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. The seed coat consists of one or more protective layers that encase the seed.
4. What is germination?
The beginning of growth, as of a seed, spore, or bud. The germination of most seeds and spores occurs in response to warmth and water.
5. What are the conditions necessary for germination?
Seed germination depends on both internal and external conditions. The most important external factors include right temperature, water, oxygen or air and sometimes light or darkness. Various plants require different variables for successful seed germination.
6. What is seed dispersal?
Seed dispersal is the movement, spread or transport of seeds away from the parent plant. Plants have limited mobility and rely upon a variety of dispersal vectors to transport their propagules, including both abiotic vectors such as the wind and living (biotic) vectors like birds.
7. Why must seeds be dispersed? What are the agents of dispersal?
Dispersal of seeds is very important for the survival of plant species. If plants grow too closely together, they have to compete for light, water and nutrients from the soil. Seed dispersal allows plants to spread out from a wide area and avoid competing with one another for the same resources.
8. What is agriculture?
Agriculture is a primary activity that includes growing crops, vegetables, fruits, flowers and rearing livestock. Agriculture is a primary activity, as it is connected with the extraction and production of natural resources.
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Answer:
1:
plants are really important for the planet and for living things. plants absorbed carbon dioxide and release oxygen from their leaves, which humans and other animals need to breathe. living things need plants to live -they eat them and in them. Plants help to clean water too.
2:
some seeds might have lost the capability to grow because of dormancy. some seeds might not find suitable condition such as warmth.
3:
In a seed, the embryo consists of three main part : the plumule, the radicle, and the hypocotyl,.In dicots, the hypocotyl extend above ground, giving rise to the stem of the plant, while in monocots, they remain below ground.
4:
Germination is usually the growth of a plant contained within a seeds; it results in the formation of the seedlings...under proper condition, the seed begins to germinate and the embryo resume growth, developing into a seedling.
5:
Seeds germination depend on both internal and external condition. The most important external factors include right temperature, water, oxygen or air and sometimes light or darkness.
6:
Seeds dispersal is an adaptive mechanism in all seed -bearing plants, participating in the movement or transport of seeds away from their parents plant to ensure the germination and survival of some of the seeds to adult plants. There are many vectors to transport the seed from one place to another.
7:
Seed must be dispersed because plants cannot walk around and take their seed to other places, they have developed other methods to dispersed (move) their seeds. The most common methods are wind, water, animals, explosion and fire.
8:
Agriculture is the art and science of cultivating the soil, growing crops and raising livestock.
Explanation:
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