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First, choose an option.
1, the following belongs to the biological is ()
A, robot B, coral C, mushroom D, dinosaur bone fossils
2, belongs to the competitive relationship between the following creatures is ()
A, snakes and frogs B, owls and voles
C, bees and flowers D, rice and weeds in a field
Lichen is the living body of algae and fungi. Algae provide organic nutrition for fungi, and fungi provide suitable living environment for algae. The relationship between fungi and algae in lichens is ()
A, help each other b, plunder c, harm to one party d, competition
4, microscope eyepiece is 5 times, the objective lens is 10 times, then the magnification of the objective lens is ().
a、5 B、 15 C、50 D、2
5, rainy days, the laboratory light is dark, when observing the slide specimen with a microscope, the correct operation is ().
A, with a large aperture, concave mirror b, with a small aperture, concave mirror.
C, with a large aperture, flat mirror D, with a small aperture, flat mirror
6, in order to facilitate observation, the position of the microscope on the experimental platform should be ().
A, slightly to the left B, slightly to the right
C, slightly before d, later d.
7. When designing the inquiry experiment, the experiment of the control group ()
First, in order to simplify the experiment and improve efficiency, it must not be set.
B, all conditions are the same as the experimental group.
C, generally only one condition is different from the experimental group.
D, for the accuracy of the experimental results, several groups of unrelated variables can be set for the control experiment.
8, in the dense forest, belongs to the decomposer is ()
A, grass and tall plants B, butterflies and birds C, monkeys and mice D, bacteria
9, known as the "kidney of the earth" ecosystem is ().
A, grassland ecosystem B, freshwater ecosystem
C, marine ecosystem D, wetland ecosystem
10 The home of all living things on the earth is ().
A, Biosphere B, Biosphere II C, Ecosystem D, Terrestrial Ecosystem
1 1, the following does not belong to the ecosystem is ()
A, sheep on the grassland B, a lake C, a forest D, a meadow.
12, which of the following phenomena cannot reflect the adaptation of organisms to the environment? ( )
A, pigeons fly with wings B, the protective color of cicadas
C, fish breathe with gills D, cats catch mice
Second, please judge.
1, human beings can't live without living things ()
After the heavy rain, the earthworm climbed to the ground. This is mainly affected by lighting factors. ( )
3. Wolves, rabbits, etc. Living in alternating cold and warm places, their body hair grows thicker in winter than in summer; Hippos living in tropical areas such as Africa have almost no hair. These are protective colors. ( )
4. In a certain area, the unified whole formed by biology and environment is called ecosystem. ( )
5. When observing the slide specimen with a microscope, if the image you see is at the lower left of the visual field, you need to move the slide specimen to the lower right so as to move the image to the center of the visual field. ( )
6. Abiotic components refer to all abiotic substances and energy except living things. ( )
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1. Raising fish in rice fields will make rice strong and fish fat. The relationship between rice and fish is a relationship.
What you see in the eyepiece of microscope is an image. If you look at "P", what you see under the microscope is.
3. Three elements of scientific inquiry: clarity and inquiry.
There will be more.
The components that make up an ecosystem are air, sunlight, water, soil and many other things.
, such as,, etc.
Fourth, explore the problem.
Once Xiao Ming bought a bag of bean sprouts and put them in the sun. In the afternoon, he opened it and found that many bean sprouts had become "mung beans". Xiao Ming feels strange. He told this discovery to his classmates, who asked him to find out the problem and let you explore with them.
(1) Your question is: Can it affect the production of chlorophyll?
(2) For your question, please make a hypothesis: it will affect the production of chlorophyll.
(3) Design the experimental scheme:
A. Divide a certain amount of fresh soybean sprouts into two parts and put them into container A and container B respectively.
B, A is cultivated locally and B is cultivated locally.
(4) The expected effect of this experiment is that the bean sprouts in A are green and those in B are green. (Fill in "change" or "unchanged")
(5) Experiments prove that the formation of chlorophyll is necessary. Agree 4| Comment