Biology is the study of life and living things. It can be divided into different areas that look at the structure, function, anatomy, and behavior of organisms.
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Question 641: One basic similarity between nervous and endocrine system is that they both
Options:
A) produce widespread effects
B) transmit very fast impulses
C) involve the use of chemical substances
D) produce precise and short-lived effect
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The correct answer is C .
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Question 642: 5 g of oven dried soil was heated in a furnace for 24 hours. After cooling, it weighed 4.8 g. What is the amount of humus in the soil?
Options:
A) 40.0g per 100 g dry soil
B) 4.4g per 100g dry soil
C) 4.0 g per 100g dry soil
D) 0.4g per 100g dry soil
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The correct answer is C .
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Question 643: A non - renewable alternative source of energy is
Options:
A) wind generator
B) solar panels
C) nuclear energy
D) hydroelectric power
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The correct answer is C .
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Question 644:
What is the primary source of variation in a population?
Options:
A) Gene flow
B) Mutation
C) Natural selection
D) Genetic drift
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The correct answer is B .
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Question 645: Nitrogen is released into the atmosphere when ________
Options:
A) plants absorbs mineral salt
B) sugar is completely broken down
C) through plant uptake
D) when lightning strike
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The correct answer is D .
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Question 646: All living cells require water because it
Options:
A) is a medium for all metabolic reactions
B) is a medium that neutralizes the acids in cells
C) is the main source of energy for the cell
D) prevents the development of dieseases in cells
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The correct answer is A .
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Question 647:
In an experiment to determine the percentage of humus and water in a soil sample, the following results were obtained
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is
Options:
A) 16.7%
B) 17.6%
C) 26.7%
D) 16.2%
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The correct answer is A .
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Question 648:
Which of the following is a primary source of pollution in aquatic ecosystems?
Options:
A) Soil erosion
B) Industrial discharge
C) Air pollution
D) Deforestation
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The correct answer is B .
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Question 649:
Use the list of ecological constituents below to answer the question below
1. Mango 2. Spear grass 3. Goat 4. Sheep 5. Temperature 6. Beans 7. Rock 8. Water
The physical factors are represented by
Options:
A) 1, 5, 6
B) 4, 5, 7
C) 5, 7, 8
D) 6, 7, 8
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The correct answer is C .
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Question 650:
In the diagram, the function of the correcting lens is to
Options:
A) diverge incoming rays
B) converge incoming rays
C) reflect incoming rays
D) screen incoming rays
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The correct answer is B .