The seventh grade classroom exercise book Biology Book 1 A{ Answer}

The answer to the seventh grade biology workbook is for your reference.

Chapter I Biology and Environment Section I Living Environment of Biology

I.1.b2.c3.d4.d5.b6.d7.d8.d9.d10.b.

3.2. Basic conditions for survival: food, air, sunshine, water, suitable temperature, reasons why a territory is on the verge of extinction:

① Food shortage ② The living environment is destroyed ③ The reproductive capacity is low.

4. 1. Creatures include wheat, water chestnut, aquatic plants, swallows and so on. 2. Tip: living things can breathe; Can discharge the waste produced in the body.

Things; Can respond to external stimuli; Organisms can grow and reproduce; All living things are made up of cells except viruses. And abiotic

number

Section 2 The environment affects the survival of living things

I.1.b2.b3.b4.a5.a6.d7.d8.a9.d10.b1.a12.c.

2. 1. sunshine, air temperature, water and soil (choose four at will) 2. The same species and other species 3. Predator-prey relationship, parasitic relationship, biological relationship.

* * * relationship

Three. 1.,/2.,/3.× 4 .× 5 .×

( 1)-C(2)-B(3)-A(4)-B(5)-B(6)-A。

5. Air, sunlight, water and temperature.

Seven, 1. Unreasonable, because there are many variables in this experiment: light, temperature, living space of plants, and the conclusion of the experiment cannot be said.

Ming problem. 2. Algae plants can carry out photosynthesis through sunlight. There is direct sunlight in the shallow waters of the bay, and green algae can

In order to carry out photosynthesis, brown algae contains chlorophyll and phycoerythrin, which can absorb blue-purple light, thus increasing light absorption.

Promote photosynthesis; Red algae also contains phycoerythrin, which can absorb green light, thus increasing the absorption of light energy and promoting photosynthesis. ?

The third quarter biological impact on the environment

I.1.a2.c3.a4.d5.d6.b7.c8.d9.b

2. 1. influence 2. Disadvantage 3. The accumulation of a large amount of feces in grassland pasture has improved the grassland.

Three. 1.,/2.× 3.,/

4. 1.( 1) Shrub naked plants can increase air humidity. (2) bare land. (3) If there is water nearby, it will increase the moisture in the air.

Sources interfere with the determination of the relationship between plants and air humidity (4) Plants can produce oxygen by photosynthesis; Plants can absorb toxins.

Gas; Plants can keep water and soil; Plants can purify the air and reduce noise. 2.( 1) Temperature relative humidity (2) Increase air humidity.

(3) reduce the temperature

[Hint]: The answer can be given from the effect of afforestation on soil.

Six, 1. Goats eat grass roots, which affects the growth of grass. If there are too many goats, it will destroy the grassland vegetation. 2.

[Hint]: For example, nuclear power plant leakage, environmental pollution caused by excessive use of pesticides, and soil hardening caused by improper use of chemical fertilizers.

The fourth quarter biological adaptation to the environment

I.1.d2.d3.c4.d5.b6.b7.b8.d9.d10.c1.c12.d?

Second, 1. Adaptive effects II. Reduce water evaporation and drought in the body. Wide adaptive environment. Morphological structure and physiological behavior. Adaptability 6. Adapt.

Three. 1 .× 2 .× 3.,/4.,/5 .×

Fourth, 1B2C3C4C5A6B

5. 1.( 1) Thunderbirds in cold areas adapt to the surrounding environment with body colors similar to the environment, while non-toxic butterflies in South America adapt to the environment by simulating the shapes and colors of poisonous butterflies. (2) The adaptation of organisms to the environment is conducive to the survival of organisms and the reproduction of races. 2.( 1) Bird branch color (2) Adapted wood adapted to six, 1. It is suggested that the environment is constantly changing, and the living things are constantly evolving. The living things adapt to the environment and affect the environment at the same time, and the living things and the environment interact with each other. 2. The hatching of carp eggs is greatly influenced by environmental factors, with low hatching rate and low survival rate of larvae. Therefore, carp must lay more eggs to ensure the continuation of its species. However, the hatching of bird eggs is less affected by environmental factors, and the hatching rate is higher. It can raise young, and the offspring are easy to survive, so it doesn't need to lay many eggs, which is the adaptation of organisms to the environment. Section 5 Basic methods of scientific inquiry \ \ i.1.b2.c3.b4.d5.d6.a7.b8.a9.c10.c1.a12. 1. Invisible microstructure. Experiment 3. Target process result 4. Increase and decrease the feedback to the fish tank 5. Ask questions, make assumptions, make plans and carry out experiments, and get M conclusion 6. Reverse product 7 Plane mirror concave mirror III, 1. ① Slide the cover glass 2. Petri dish 3. Eyedropper 4. Eyedropper 5. Beaker 6. Tripod and asbestos net. Alcohol lamp 8. Magnifier 2. (66 ⑦ Shader ⑨ Mirror (3) ⑧ Stage ⑧ Light hole ⑧ Plate clamp (4)⑩ Coarse focus screw (5)③ Converter ① Eyepiece (6)⑩ Coarse focus screw ⑩ Left fine focus screw (7)① Eyepiece ④ Objective lens (8)③ Conversion IV. (2) Where did these bacteria come from? (3) The broth automatically produces bacteria (or bacteria run into the broth from the air). (4) Add broth to the towel of the flask, pull out the "Goose Neck", boil it and let it stand for 4 years, shake the Goose Neck Bottle, and the broth will soon rot and deteriorate. (5) Bacteria enter the broth from the air towel to deteriorate it. Five, 1. Using 50 capsules can reduce the error; Only two seeds are used in the experiment, and the result will be a lot of contingency, which is not enough to explain the problem; Using 200 capsules can improve the accuracy of the experiment, but it will increase the difficulty of the experiment. 2. Group A is a control experiment. By setting up a control experiment, we can know that the difference of experimental results is caused by a variable, so as to achieve the purpose of the experiment. When setting up the control experiment, it is required that all the other factors are the same except the different factors studied, so as to ensure that the difference in experimental results is only caused by a single variable. 3. No, except the solution, the temperature should be the same. Chapter II Ecosystem and Biosphere Section 1 Various Ecosystems i.1.d2.b3.a4.d5.c6.d7.a8.B9.c10.a1.a12.d Target object scheme 3. Producer and consumer decomposer 4. Biological and abiotic parts 5. Green plants, human and animal bacteria and fungi. ,/2.,/3.× 4.× 5.× 4， 1D2E3A4B5C6F 5， 1。 In a dark aquarium, Ceratophyllum can't release oxygen through photosynthesis, but it consumes oxygen with fish. In the end, Ceratophyllum and fish will die because of lack of oxygen. (4) Tropical fish will die because the temperature is too low. The survival of living things is influenced by the environment. (1) Explain the increase and decrease of cereal plants, aquatic plants, bacteria, fungi and insects, rabbits, insect-eating birds, fish and eagles (2). (1) C. 3(2) Rainfall in tropical rain forest is the most, and that in desert is the least. (3) Different precipitation will affect the distribution of organisms. Tropical rain forest towels contain amazing plants and other creatures. The annual precipitation of desert towel is less than 250mm, and the evaporation of water is much greater than the precipitation, so the creatures living in the desert need to have strong adaptability, not only to adapt to drought and water shortage, but also to the harsh conditions with large temperature difference, so the types and quantities of creatures are relatively small. 5 1.com: /show/8644335.html