Can you give six scientific questions, a few scientific questions

It seems to be 15 points.

There are many aspects to science, which one do you want? I searched some casually, I don't know if it's useful?

1. What is the scientific name of the hedgehog, other names, and can it hibernate?

A: Hedgehog Erinaceus europaeus The local name is the common hedgehog, the thorn ball. Hedgehogs. Hibernates.

How do hedgehogs hibernate?

Reason for hibernation: Hedgehogs are heterothermic animals because they cannot stably regulate their body temperature to keep it at the same level, so hedgehogs hibernate in winter.

Hibernation Grounds: Dead branches and piles of fallen leaves are favorite hibernation places for hedgehogs. They use twigs and weeds to create hibernating nests. Sometimes their nests have a 50 cm compartment. They can also sleep under wooden stairs or other man-made places.

Hibernation manifestations: When the hedgehog hibernates in the nest, its body temperature drops to 9 degrees. Breathe 1-10 times for a minute. Hibernating hedgehogs will occasionally wake up, but do not eat, and soon fall asleep again. Hibernating hedgehogs will starve to death if they wake up too early.

2. What is the definition of thermogravimetric analysis?

A: It is an analytical method that can analyze the moisture, volatiles, ash, fixed carbon and LO of the analyzed substance

3. What is the concept of plant micronucleus technology?

A: Plant micronucleus technology is a new way of partial genome transfer between sexually hybridized and incompatible plants developed in recent years. It is of great significance in plant breeding that single or multiple chromosomes can be transferred between plants of different genera through micronucleus technology, and the traits of the regenerated plants obtained are stable.

Micronucleus technology can also be used to locate genes, establish DNA libraries of specific chromosomes, and identify gene functions.

4. Where do penguins live?

A: There are 18 species of penguins in the world, of which 7 species are emperor penguins and king penguins, and the rest are temperate penguins, which are distributed in temperate regions of the southern hemisphere.

5. The following statements about chromosomes are incorrect.

A chromosome is present in the nucleus.

The B chromosome is present in both somatic and germ cells.

The C chromosome is susceptible to darkening by alkaline material.

Half of each chromosome comes from the father and half from the mother.

a:d (homologous chromosomes are a pair.)

Each chromosome can only come from one side).

6. The number of 7 electrons outside the nucleus of n 4 electrons.

What does that parallel mean in Hunt's rule?

Is it a positive 1 2 or a negative 1 2?

a:1 0 0 1/2

There are only two states of motion of electron spins: parallel and antiparallel. Parallel means that the spins are in the same direction and the angular momentum is superimposed. Antiparallel means that the spins are in opposite directions and the angular momentum is counteracting.

Generally, 1 2 is written first, that is, the arrow facing up is drawn first.

In the experiment "Studying the Characteristics of Plane Mirror Imaging", a piece of () is erected on the table as a plane mirror, and during the experiment, the image of the object behind the mirror and the image of the same object in front of the mirror should be completely overlapped

In order to make people feel spacious, install a flat mirror on the wall that is the size of the wall, and use the principle of () to make people feel that the size is twice that of the original ()?

The Moon is formed by the Moon's response to sunlight (mirrored or diffuse).

The distance between the person and the eye chart is 5m, the house is small, and the plane mirror is hung on the opposite wall, the distance from the eye chart to the mirror is 3m, the person should sit facing the mirror, and the distance between the person and the mirror is () m (to calculate the process, why).

What are the benefits of bicycle tail lights?

1.Not necessarily, it depends on the temperature.

2.Snow is crystals.

3.Visual problems.

1. Because the stove shed is prepared and imitated, so U is equal, heat = ui, i = U r, so: p=u2 r, so choose D

w=pt=100w*60s=6000j

2)p=ui=220v*220v/2ω=24200w w=pt=24200*60=1452000j

3、w=wa/n=118800/90%=132000jp=w/t=132000j/300s=440wr=u2/p=220*220/440=110ω

A 1Use a balance to measure the mass m of all pins

2. Measure the mass m of 30 pins again

3. The number of pins in this pile is 30 mm

Second, measure the circumference of the bicycle wheel, and the length of the bicycle wheel will be known, set to l if you note the number of turns of the bicycle n

Then the bicycle goes to the east road and the car is NL

1.How is sound produced?

2.How does sound travel from the emitter to the distance?

3.Can you come up with a way to measure the speed of sound?

4.How do people hear sounds?

5.What are the applications of ultrasound?

6.What factors are involved in loudness?

7.Is there a relationship between pitch and loudness?

8.How does light travel in a medium?

9.How does the shadow come about? What are the causes of solar and lunar eclipses?

10.What unit of physical quantity is "light year"? What is the distance between Cowherd and Vega?

11.Why do you turn on the light and see what's in the house?

12.Why does the chalk words become unreadable when the blackboard is "reflective"?

13.What are the characteristics of plane mirror imaging?

14.The trees and houses on the shore look upside down in the water, why?

15.What are the effects of flat mirrors on light?

16.How does light propagate obliquely from one medium to another?

17.What law does light follow when it is refracted against?

18.Is white light monochromatic? Can dispersed white light be restored?

19.Why do objects have different colors?

20.What are the properties of infrared light? What are the applications of infrared?

21.How to design an experiment to determine the focal length of a convex lens of unknown focal length?

22.How does the camera image and get the picture?

23.What is the difference between the principle of small hole imaging and camera imaging?

24.What is the principle of magnifying glass imaging?

25.How do you explain how cameras, projectors (slide projectors) and magnifiers work?

26.What is the construction of thermometers commonly used in homes and laboratories? What is the principle of temperature measurement?

Formation of precipitation: Because the upper altitude is colder, the saturation of water decreases. When the wind blows to the windward slope, the air rises, and the original unsaturated water vapor becomes cold and becomes supersaturated, and it is easy to form rainfall.

The monsoon climate is a mixture of continental and oceanic climates. In summer, under the influence of warm and humid air currents from the ocean, the climate is hot, humid and rainy, and the climate is oceanic. In winter, it is affected by the dry and cold air flow from the mainland, and the climate is cold, dry and rainy, and the climate is continental.

Climate & Monsoon: In monsoon climates, summers are warm and winters are cold. As a result, the annual temperature range is greater than that of the oceanic climate.

The coldest month appeared in January, showing the characteristics of continental climate, and the hottest month appeared in July and August, and the temperature in autumn was higher than that in spring, and it showed the characteristics of oceanic climate. For example, in Changsha, the annual is poor, the coldest month is January, the average temperature, and the hottest month is July and August. In fact, in the 30 years from 1951 to 1980, there were 1 3 years when August was warmer than July, and from the average maximum temperature, August was the hottest.

In the 30 years from 1951 to 1980, there were 14 years when the average temperature in August was higher than in July, and the average maximum temperature was also the hottest in August.

In the monsoon climate, the summers are wet and rainy, and the winters are dry and rainy. For example, the annual precipitation in Changsha is 1390 mm, and 71 in March and August; The annual precipitation in Nanjing is 1031 mm, accounting for 74 in April and September; Under monsoon climate conditions, the amount of precipitation and the morning and evening of the rainy season are completely determined by the morning and evening and the strength of the monsoon. For example, the rainy season in Changsha is one month earlier than in Nanjing, and in North China, the rainy season is only in June and August, and even only in July and August.

The length of the rainy season is related to the control of the summer monsoon. In monsoon climates, rainfall is extremely erratic and varies greatly from year to year. In Changsha, rainfall is two times higher than in a rainless year, three times more in Nanjing, and more than five times more in Beijing.

Therefore, under the monsoon climate, frequent floods and droughts are extremely unfavorable to people's production and life.

The high temperature of the monsoon climate is basically the same as that of the rainy period, and although it is inevitably hot and unbearable, it is very beneficial to the development of agriculture. This is because there is plenty of rain when crops are growing vigorously and water is needed most**.

1 Thunder electromagnetic waves.

2 Electrical signals electromagnetic waves.

3 It can't be spread in a vacuum in Huichiqing, and it can be spread in the air of Zhendanyou.

4 Electromagnetic frontland.

300000x500=150000000

Atoms make up molecules.

An atom loses or gains electrons and becomes an ion.

An element is a collective of a group of atoms with the same number of nuclear charges.

For example, a water molecule is made up of 2 hydrogen atoms and an oxygen atom, and water is made up of hydrogen and oxygen.

The plastic molecule is made up of a few carbon atoms and a few hydrogen atoms, and it is made up of the elements hydrogen and carbon.

Oxygen is made up of oxygen molecules, and oxygen molecules are made up of two oxygen atoms.

The number of protons is different!! Or the number of neutrons is different.