Science, asked by mukeshsandhya09, 7 months ago

1. Write the different types of silk.

2. Which bacteria help in fixing atmospheric nitrogen in the soil?

3. How can we prevent soil erosion? Write any 2 points.

4. List any two occupational hazards faced by workers of wool industry.

5. Name any two parasitic plants.

6. Name the instrument which is used to measure the current flowing in a circuit.

7. Define sericulture.

8. Name the structures that carry starch to various parts of the plant.

9. Write the scientific name of mulberry silkworm.

10. What are the negative effects of current?

II. ANSWER VERY SHORTLY. 4 X 2 = 8

1. Distinguish between Autotrophic and Heterotrophic nutrition.

2. List a few animals other than sheep which produce wool. Also mention the main use

of their wool.

3. What would happen if we replaced the wire in a fuse with thick copper wire?

4. Write the types of soil with one characteristics of each.

III. ANSWER IN SHORT 4 X3 = 12

1. Define photosynthesis and write its chemical equation.

2. Write a short note on pseudopodia and villi.

3. Explain how an electric doorbell works.

4. List four main causes of soil pollution.

IV. ANSWER IN DETAIL 2 X 5 = 10

1. Explain nutrition in a ruminant.

2. What effective safety measures should one take during a storm?

Answers

Answered by Anonymous

Answer:

How many different types of silk are there? In short, there are four types of natural silk produced around the world: Mulberry silk, Eri silk, Tasar silk and Muga silk. Mulberry silk contributes around as much as 90% of silk production, with the mulberry silkworm generally being regarded as the most important.
cyanobacteria Anabaena

Free-living nitrogen-fixers include the cyanobacteria Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium. Learn more about cyanobacteria.

3. How to prevent soil erosion

Crop Rotation: Rotating in high-residue crops — such as corn, hay, and small grain — can reduce erosion as the layer of residue protects topsoil from being carried away by wind and water.
Conservation Tillage: Conventional tillage produces a smooth surface that leaves soil vulnerable to erosion.

4. Soil types

Clay soils are heavy, high in nutrients, wet and cold in winter and baked dry in summer.
Sandy soils are light, dry, warm, low in nutrients and often acidic.
Silt soils are fertile, light but moisture-retentive, and easily compacted.
Loams are mixtures of clay, sand and silt that avoid the extremes of each type.

“Autotrophs are organisms that prepare their own food through the process of photosynthesis, whereas heterotrophs are organisms that cannot prepare their own food and depend upon autotrophs for nutrition.”
A pseudopod or pseudopodium (plural: pseudopods or pseudopodia) is a temporary arm-like projection of a eukaryotic cell membrane that are developed in the direction of movement. Filled with cytoplasm, pseudopodia primarily consist of actin filaments and may also contain microtubules and intermediate filaments.Pseudopods are used for motility and ingestion. They are often found in amoebas.
The "something" is often an electric bell: a little metal bell (like one on a bicycle) and a clapper (hammer) powered by an electromagnet. When someone presses the button, the electromagnet is activated and pulls on the clapper, which strikes the bell.
Soil pollution is mostly caused by mindless human activities such as:

Ruminants are mammals that are able to acquire nutrients from plant-based food by fermenting it in a specialized stomach prior to digestion, principally through microbial actions. ... The process of rechewing the cud to further break down plant matter and stimulate digestion is called rumination.
Things to keep in mind during storm

Explanation:

MARK ME AS A BRAINLEIST

AND FOLLOW ME AND THANKS MY ANSWER PLEASE

Previous Question

Next Question