The experimental results of the second year of junior high biology are urgent, and the answers are g

I don't know the first question.

2 There is mucus.

3 Tingling sensation bristles.

4 Segment contraction and peristaltic bristle motility.

2) Make assumptions: the valve is the gateway to the entry of locust gases.

3) Experimental procedure: Insert two locusts into the trachea in the valve respectively.

The locust key is fixed to the glass strip with a thin wire.

Plug the valve of one of the locusts.

4) Expected results of the experiment: Locusts that were blocked from the valve were unable to breathe.

6) Discussion: 2 locusts of the same size and living conditions were selected for the reason that the experimental conditions were consistent and the conclusions obtained were accurate.

Biology Experiment Plan for the First Year of Junior High School! The question is: Is carbon dioxide a raw material for plants to photosynthesize? Ask to write out the steps: 1 Ask a question 2 Make a hypothesis 3 Make a plan 4 Implement the plan method: Controlled experiment.

1. The growth, physiological and other conditions are basically the same, 2 pots of plants A and B, starved in the dark for 12 hours.

2. After taking it out, it is cultured in 2 closed transparent glass covers, a cup of sodium hydroxide of a certain concentration, and a cup of distilled water of the same volume in B, both of which are given appropriate light and temperature.

3. After incubating for a period of time, remove some leaves at the same time, and detect the starch after the alcohol is decolorized.

The real world can also be experimented with aquatic plants such as goldfish algae, one is cultivated with distilled water, and the other is cultured with a certain concentration of sodium bicarbonate solution, and the light intensity and light time must be obtained, and the bubbles are observed. 1. Ask the question: Is carbon dioxide an essential raw material for photosynthesis?

Second, search and cultivate, make a hypothesis: carbon dioxide is an essential raw material for photosynthesis, and carbon dioxide is an indispensable condition for the production of organic matter from green leaves.

3. Make a plan: 1. Experimental materials: sodium hydroxide solution, two potted geraniums (or broad beans), alcohol, iodine wine, two small beakers, two large beakers, two petri dishes, two alcohol Kaiqiao lamps, two triangles, two asbestos nets, tweezers, matches, water, and two glass covers.

2. Experimental steps: 1. Put two potted geraniums in a dark place for a day and night. 2. The two potted geraniums are covered with glass covers, and sodium hydroxide solution is placed in one cover, both in the sun.

3. After a few hours, pick the leaves of the two potted geraniums respectively. 4. Put the leaves into two small beakers containing alcohol, and heat them with water to dissolve the chlorophyll contained in the leaves into the alcohol, and the leaves turn yellow-white. 5. Rinse the leaves with water, then put the two leaves into a petri dish respectively, and add iodine solution to the leaves.

6. Stop for a moment and rinse off the iodine solution with water.

4. Phenomenon: The leaves of geraniums in glass covers containing sodium hydroxide solution do not change color and are still yellowish-white, while the leaves of geraniums without sodium hydroxide solution turn blue.

5. Conclusion: Geraniums containing sodium hydroxide solutions have no starch, i.e., no organic matter. Assuming consistent with the results, carbon dioxide is an essential raw material for photosynthesis.

Materials and utensils: an appropriate amount of fresh greens and scalded greens with boiling water, two black plastic bags, two glass tubes, two test tubes, and an appropriate amount of clarified lime water.

1。Ask a question:

2.Make assumptions:

3.Make a plan:

4.Experimental phenomenon.

5.Your conclusion is:

1。Ask a question:

Live greens leaves are no longer under the condition of light, can carry out respiration, and the production can be made.

Clarified lime water to become cloudy gas?

PS: When writing this question, you need to state the conditions and variables given in the question.

so as to achieve the purpose of controlling variables, and also more and the topic).

2.Make assumptions:

Hypothesis 1: Fresh greens can be produced by cellular respiration in an environment without light.

Clarification of lime water to turbid carbon dioxide gas.

Hypothesis 2: Blanched greens in boiling water can be produced by cellular respiration in the absence of light.

Carbon dioxide gas that can make clarified lime water turbid.

Hypothesis 3: Both fresh greens and blanched greens in boiling water can pass through the cells in an environment where there is no light.

Respiration produces carbon dioxide gas that can muddy the clarified lime water.

Hypothesis 4: Neither fresh greens nor blanched greens in boiling water can pass through cells in an environment without light.

Respiration produces carbon dioxide gas that can muddy the clarified lime water.

PS: Hypothesis is to make the maximum guess about the phenomenon that may occur in the experiment, so all situations are needed.

To consider) 3Make a plan:

Also known as: experimental protocol design).

1. Divide the fresh greens and the blanched greens into two equal portions, and add the same separately.

and seal the tube wall and tube mouth with a black plastic bag, and label as Experimental Group 1 and.

Control group 12: Let stand for a period of time while taking out the glass catheter and introducing clarified lime water into the test tube with uniform shaking.

After swinging and letting stand for the same amount of time under the cover of a black plastic bag, observe the clarified lime in the tube.

Changes in water. 3: Observe the results, fill in the experiment report, and select and judge the hypothesis.

4.Experimental phenomenon.

The test tubes of the experimental group produced carbon dioxide in a dark environment that can muddy the clarified lime water.

gas, but no such gas is produced in the sedan chair group.

5.Your conclusion is:

Based on the analysis, it can be concluded that fresh greens can no longer produce respiration in the absence of light.

Carbon dioxide gas is used and produced, but vegetables that have been scalded in boiling water cannot produce such gas.

body, it shows that respiration is related to cell activity, hypothesis 1 is correct, I hope my answer can help you solve such a problem, thank you.

Soybeans will slowly begin to germinate with sufficient air, appropriate moisture, and suitable temperature. When the bean germinates, the skin of the bean absorbs water and swells and becomes soft, and the bean gradually decomposes the nutrients stored in the cotyledons through its own respiration, converting it into substances that can be absorbed and utilized by the cell for its own growth, and transporting it to the hypocotyl, radicle and germ of the embryo. At the beginning of bean germination, radicle grows the fastest, and will first break through the seed coat to grow to the ground and develop into roots.

Then there is the hypocotyl, which subsequently elongates. When the shaft grows to a certain length, it becomes the sprout we see now. The germ breaks through the seed coat and grows on its back and develops into stems and leaves.

Through this process, the embryo of the seed develops into a seedling. And, the part we eat is mainly the hypocotyl of the sprouts.

Steps:

Materials: soybean seeds (full and viable embryos), water, jars, gauze (or absorbent paper).

Methodological steps; 1.Place 10 seeds in a jar with several layers of gauze (or absorbent paper). Add water, soak the gauze, but do not let the water flood the seeds, and take care to add water frequently to keep the gauze moist.

2.Keep the unit in a warm place.

3.Observe and take notes while the seeds germinate.

That's it, let's pick it (

In the process of soybean germination into soybean sprouts, a part of organic matter is consumed through respiration, so the total amount of organic matter is reduced, but in the process of germination, a large number of new organic matter is synthesized by using the organic matter stored in soybean to construct the tissue structure of soybean sprouts.

.All living things have a metabolism. This is one of the most fundamental features. Metabolism refers to all the chemical reactions in living organisms, such as the breakdown of glucose, the hydrolysis of proteins, and the synthesis of proteins from amino acids.

2.Organisms have the ability to adapt to their environment. That's why different environments will have different creatures.

3.Organisms have both genetic and mutated properties. Heredity, the popular understanding is that the offspring have the same characteristics as the parents, for example, the offspring of a person is still a human being, and he still has human characteristics.

Variation, on the other hand, is when the offspring exhibit different characteristics from the parents, for example, no child looks exactly like the parents. Living beings have evolved so far, and it is impossible without mutation!

4.Organisms can also change the environment. Just think about how we humans do it!

5.The basic unit of building blocks of living things is the cell.

6.Bioenergetic reproduction and development. You yourself are the best example of this.

7.Organisms are stressful. For example, phototropic growth of plants.

The life of soybeans goes through the processes of seed germination, emergence, seedling growth, branching, flowering, pod-setting, grain drumming, and maturity. It can be divided into 6 growth periods.

Seed germination and emergence.

The radicle first protrudes from the ovule bead pores, and germination is called when the radicle elongates to the same length as the seed. The cotyledon is elongated, the seed coat falls off, and the cotyledons are exposed to the soil surface with the elongation of the hypocotylyl, and the seedlings are called when the cotyledons are elongated. The conditions are suitable, and the soybean is 4-6 days after sowing.

Seedlings can emerge. More than half of the cotyledons in the field are unearthed for the emergence stage.