Why is the presence of clay particles important in soil?
Tiny particles (humus and clay) are very important for holding plant nutrients in the soil. Clay and humus particles have a negative surface charge. Cations are positively charged. Because opposites attract, the clay and humus hold cations, and prevent them from being leached out of the soil by water movement.
What is the most prominent mineral deficiency symptom seen in this photo?
What is the most prominent mineral deficiency symptom seen in this photo? a. Magnesium, because its deficiency shows symptoms on older leaves. This plant has chlorosis on young leaves.
What is the physical basis of the Phototropic response?
What is the physical basis of the phototropic response? Auxin is asymmetrically distributed in shoots because the auxin on the side of the plant facing the source of light is destroyed.
What is the correct sequence of steps during infection of plants by nitrogen fixing bacteria?
What is the correct sequence of steps during infection of plants by nitrogen-fixing bacteria? Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms.
What are the clay particles?
Clay-sized particles are rock and mineral fragments less than 2 micrometers in diameter (about the size of most bacteria). Clay-sized particles are created through physical weathering of larger rocks and minerals.
Why is it better to use organic fertilizer and organic pesticides?
Although organic fertilizer can be more costly than synthetic, it can reduce the need for pesticides and the overall nitrogen, phosphorus and potassium requirements. Because of the reductions, organic fertilizer can be cost neutral and sometimes a cost savings.
Which fertilizer is derived from minerals atmospheric gases water and other materials?
The most common sources of nutrients in mineral fertilizers are nitrogen, potassium and phosphate. Nitrogen originates from the air. The most common process in nitrogen fertilizer manufacturing is to create ammonia from a mixture of nitrogen from the air and hydrogen from natural gas.
What roles do nutritional deficiency and nutritional excess play in disease?
Both nutritional excess and deficiency are associated with disease. For example, nutritional excess, particularly in refined carbohydrates and saturated fats, coupled with physical inactivity, can result in chronic inflammatory conditions such as obesity and cardiovascular disease.
How does phototropism occur in plants Class 10 Ncert?
Explanation: The movement of plants or other organisms in response to light is called phototropism. The movement can be either towards the light or away from it. The stem grows in direction of the sunlight (positively phototropic) and roots grow away from it (negatively phototropic).
Why do plants have one hormone that promotes seed germination and another that suppresses seed germination Why not just have one or the other?
Cell division by activating cell-cycle-promoting genes. Why do plants have one hormone that promotes seed germination and another that suppresses seed germination? Why not just have one or the other? Antagonistic hormones allow more finely directed control of germination.
How do Rhizobium bacteria and leguminous plants help each other in their survival class 7?
Rhizobium and leguminous plants live in a symbiotic association with each other. In this, both the organisms are benefited from each other. The bacteria fix atmospheric nitrogen and make it available to the plants. On the other hand, Rhizobium receives nutrition from the plant in the form of organic acids.
Where are Rhizobium bacteria present how do they help a plant in the process of nutrition?
Answer. Rhizobium is a bacterium found in soil that helps in fixing nitrogen in leguminous plants. It attaches to the roots of the leguminous plant and produces nodules. These nodules fix atmospheric nitrogen and convert it into ammonia that can be used by the plant for its growth and development.
What size are silt particles?
0.002 to 0.05 mm Silt particles are from 0.002 to 0.05 mm in diameter. Sand ranges from 0.05 to 2.0 mm. Particles larger than 2.0 mm are called gravel or stones. Most soils contain a mixture of sand, silt and clay in different proportions.
What are silt particles?
Silt is a solid, dust-like sediment that water, ice, and wind transport and deposit. Silt is made up of rock and mineral particles that are larger than clay but smaller than sand. Individual silt particles are so small that they are difficult to see. To be classified as silt, a particle must be less than .
Are there different types of neem oil?
Neem products usually have one of two active ingredients. Azadirachtin is a substance derived from neem seed oil and is most responsible for killing and repelling insects. After the Azadirachtin is extracted from neem oil, the remaining material is called clarified hydrophobic neem oil.
What do you understand by green manure?
Green manures are crops grown specifically for building and maintaining soil fertility and structure, though they may also have other functions. They are normally incorporated back into the soil, either directly, or after removal and composting.
What are the different fertilizers used in agriculture explain its impact on agriculture?
The fertilizers contain nutrients such as nitrogen and phosphorus that enters the water bodies through agricultural runoff and causes eutrophication. It causes soil, water and air pollution by adding harmful chemicals into the environment.
What is the difference between manure and fertilizers Class 8?
Manure is the organic matter added to the soil to increase its fertility. On the contrary, fertilizers are chemicals that are added to the soil to increase its fertility. Fertilizers might harm the soil, but manure is environment-friendly.
Why does illness affect a person’s nutritional status and appetite?
Poor, inadequate diets weaken the body, making disease and illness more likely. Disease, in turn, often increases the body's need for food. Repeated and prolonged illnesses, such as diarrhoea and malaria, contribute to malnutrition, as nutritional needs are higher during and following illness.
How does heart disease relate to diet?
Eating a diet high in saturated fats, trans fat, and cholesterol has been linked to heart disease and related conditions, such as atherosclerosis. Also, too much salt (sodium) in the diet can raise blood pressure. Not getting enough physical activity can lead to heart disease.
How do Auxins promote the growth of a tendril around a support?
Auxin is the hormone that promotes the growth of tendril around a support as it is synthesized in the tip of the shoot and stimulates the growth of the cells on the opposite side which causes coiling of the tendril around the support.
How can you demonstrate phototropism If a glass jar soil bean seeds are given?
<br> Procedure : <br> i) Take a glass jar with soil. Sow a bean seed near the wall of the jar. <br> ii) After 4-5 Days you will notice seed germination. <br> iii) Keep the jar under sun.
What are seed dormancy and seed germination discuss the factors of their regulation?
Seed dormancy allows seeds to overcome periods that are unfavourable for seedling established and is therefore important for plant ecology and agriculture. Several processes are known to be involved in the induction of dormancy and in the switch from the dormant to the germinating state.
What are phytohormones explain the role of phytohormones in seed germination?
Phytohormones are signal molecule produced within plants that occur in extremely low concentrations. plant hatmones control all espects of growth and development from embryogenes is the regulation of organ size pathogen defence stress tolerance and through to reproductive development.
Which of the given monera is autotrophic and fixes nitrogen symbiotically as well as in free living state?
Which of the Given Prokaryotes Fixes Nitrogen Symbiotically as well as in Free Living State? Explanation: Rhizobium and Frankia are free-living bacteria, but fix nitrogen as symbionts.
What are legume plants?
A legume (/ˈlɛɡjuːm, ləˈɡjuːm/) is a plant in the family Fabaceae (or Leguminosae), or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock forage and silage, and as soil-enhancing green manure.
How do Rhizobium bacteria and leguminous plants help each other in survival for Class 7?
Rhizobium and leguminous plants live in a symbiotic association with each other. In this, both the organisms are benefited from each other. The bacteria fix atmospheric nitrogen and make it available to the plants. On the other hand, Rhizobium receives nutrition from the plant in the form of organic acids.
How do leguminous plants fix nitrogen Class 8?
- Leguminous plants play a major role in restoration of soil nitrogen.
- Roots of leguminous plants have nodules inside which Rhizobium bacteria are present.
- These bacteria take up nitrogen from the atmosphere and convert it into ammonia which the plants easily consume.
Which soil has the largest particles?
sand Soil Texture The particles that make up soil are categorized into three groups by size – sand, silt, and clay. Sand particles are the largest and clay particles the smallest. Most soils are a combination of the three.
Which is larger clay or silt?
Starting with the finest, clay particles are smaller than 0.002 mm in diameter. Some clay particles are so small that ordinary microscopes do not show them. Silt particles are from 0.002 to 0.05 mm in diameter.