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01 The trunks are cylindrical, and the benefits of this shape for trees do not include?
A Maximum conveying efficiency with minimal material
B Intimidate pests
C Enhances the support of the trunk
D Ensure the safety of the plant body
Answer: B
【Analysis】One of the functions of the trunk is to carry nutrients and water to various parts of the plant body, and the cylindrical trunk can achieve maximum conveying efficiency with the least amount of material. In addition, the cylindrical shape also has the advantage of support, which can enhance the support of the trunk and ensure that the huge canopy and fruit will not crush the plant. Another advantage of the cylindrical trunk is the safety of the plant body. In the long life course of plants, they are bound to be harmed from the outside world, especially by natural disasters. If the trunks are square, triangular, or otherwise shaped, they are vulnerable, while cylindrical trunks are different, and no matter which direction the wind blows from, they will pass along the tangent direction of the circular surface, minimizing the degree of damage.
02 The trees on both sides of the street, the white liquid brushed on the trunk is actually ?
A Alcohol
B Carbonic acid
C Lime water
D Distilled water
Answer: C
【Analysis】The white liquid brushed on the trunk is actually lime water, which has a certain insecticidal and bacteriostatic effect, which can kill the overwintering fungi, bacteria and pests parasitic on the trunk. Secondly, pests do not like white and tidy places, when the trunk is brushed with snow-white lime water, the pests in the soil will not climb to the tree to "make trouble". Again, the black-brown trunk is easy to absorb heat, especially after being exposed to sunlight in winter, it is easy to crack, and after brushing with white lime water, it can reflect off the strong sunlight. In addition, painting the trunk white can also guide the driver to avoid driving the runway at night.
03 Brushing lime water on tree trunks mainly for?
A Wind and cold resistant
B Promotes growth
C Reduce pollution
D Insecticidal and bacteriostatic
Answer: D
04 The cell life activity is not exuberant, what is the state of the cytoplasm?
A Flows slowly
B does not flow
C Flows faster
D Evaporation
Answer: A
【Analysis】 Cytoplasm and cell life are closely related, if the cell life activity is exuberant, the cytoplasm will flow faster; the cell life activity is not exuberant, the cytoplasm will flow more slowly. Once the cell dies, the cytoplasm stops flowing.
05 Morphologically, structurally similar, functional cell populations are called?
A organ
B Life forms
C system
D Organization
【Analysis】 After the cell divides, if it changes in different directions in form, structure and function, it is the differentiation of the cell. Cells differentiate to form different tissues, and cells before and after differentiation belong to different types. And those groups of cells with similar morphology and structure and function are called tissues. The different tissues are arranged in order, which are organs. The various organs are coordinated to form a system. Organs and systems eventually make up living organisms.
06 Who is Carl von Frisch who discovered the bee communication code?
A Germany
B United States
C Italy
D France
【Analysis】German animal behaviorist Carl von Frisch, winner of the 1973 Nobel Prize in Physiology and Medicine, his excellent research on bee behavior for 50 years has revealed the communication code of bees for us.
07 Which insects of the order Fireflies are usually referred to?
A Spinning Foot
B Coleoptera
C. Missing pteropoda
D Isoptera
【Analysis】 Fireflies usually refer to insects of the Coleoptera family, and there are more than 2,000 species known worldwide. Fireflies are best known for their ability to emit light, not only for adults, but also for eggs, larvae, and pupae.
08 Is it correct to recognize the glow of fireflies?
A Only adult worms emit light
B Adults and larvae emit light
C Adults, pupae, and larvae emit light
Adults, pupae, larvae, and eggs can all glow
09 What color of light do fireflies generally do not emit?
A Green
B Yellow
C Orange
D Purple
【Analysis】 Fireflies usually refer to insects of the Coleoptera family, and there are more than 2,000 species known worldwide. Fireflies are best known for their ability to emit light, not only for adults, but also for eggs, larvae, and pupae. Different species and even different genders of fireflies have different colors of light, such as green, yellow, orange, etc., and the frequency of flicker is also different.
10 Where is the "emitter" on the firefly located?
A head
B Chest
C Abdomen
D Feet
【Analysis】The secret of fireflies' luminescence lies in a special structure on them - "light emitter". It is located on the ventral surface of the end of the firefly's abdomen, and is mainly composed of a large number of luminescent cells, as well as auxiliary structures such as reflective cells and nerves.
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