Biology Grade 10 worksheet - Free Printable
Educational worksheet: Biology Grade 10 worksheet. Download and print for classroom or home learning activities.
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Step-by-step solution for: Biology Grade 10 worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Biology Grade 10 worksheet
Here are the step-by-step solutions for the questions in your pretest:
1. In which bone is the brain encased in?
* Reasoning: The brain is a delicate organ located in the head. It needs strong protection. The skull is made of several bones fused together, and the specific part that forms the "helmet" or dome around the brain is called the cranium. The pelvis is in the hip area, ribs protect the heart and lungs, and vertebrae protect the spinal cord.
* Answer: a) cranium
2. In 2010, the population of the province of Palawan is 771,667 with a land area 14,660 km². What is the population density of Palawan in the given year?
* Reasoning: To find population density, you divide the total population by the total land area.
* Formula: $\text{Population Density} = \frac{\text{Total Population}}{\text{Land Area}}$
* Calculation: $771,667 \div 14,660 \approx 52.63$
* Looking at the options, 52.63 is closest to 52 (or it might be rounded down depending on the specific textbook's rounding rules, but 52 is the best fit among the choices provided).
* Answer: b) 52 km²
3. What is the process of releasing the semen?
* Reasoning:
* Ejaculation is the discharge of semen from the male reproductive tract.
* Ovulation is the release of an egg from the female ovary.
* Menstruation is the shedding of the uterine lining in females.
* Transcription is a biological process involving DNA and RNA.
* Answer: a) ejaculation
4. Which organism was first to appear on Earth?
* Reasoning: Evolution generally moves from water to land.
* Fishes appeared first in the oceans (hundreds of millions of years ago).
* Amphibians evolved from fish to live on land.
* Reptiles evolved from amphibians.
* Birds evolved from reptiles (dinosaurs).
* Therefore, fishes are the oldest group on this list.
* Answer: c) fishes
5. Which gland is also known as the master gland?
* Reasoning: The pituitary gland is called the "master gland" because it produces hormones that control other glands in the body (like the thyroid and adrenal glands). Parathyroid controls calcium, and the pineal gland regulates sleep cycles. Parathormone is a hormone, not a gland itself.
* Answer: d) pituitary
6. Which of the following is not caused by the autonomic nervous system?
* Reasoning: The autonomic nervous system controls things your body does automatically without you thinking about them (like heartbeat, digestion, breathing).
* Options A, B, and D describe automatic processes (energy expenditure, consumption, working without thought).
* Option C says "regulates activities under conscious control." Conscious control means you have to think to do it (like moving your arm or walking). This is handled by the *somatic* nervous system, not the autonomic one.
* Answer: c) regulates activities under conscious control
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Final Answer:
1. a
2. b
3. a
4. c
5. d
6. c
1. In which bone is the brain encased in?
* Reasoning: The brain is a delicate organ located in the head. It needs strong protection. The skull is made of several bones fused together, and the specific part that forms the "helmet" or dome around the brain is called the cranium. The pelvis is in the hip area, ribs protect the heart and lungs, and vertebrae protect the spinal cord.
* Answer: a) cranium
2. In 2010, the population of the province of Palawan is 771,667 with a land area 14,660 km². What is the population density of Palawan in the given year?
* Reasoning: To find population density, you divide the total population by the total land area.
* Formula: $\text{Population Density} = \frac{\text{Total Population}}{\text{Land Area}}$
* Calculation: $771,667 \div 14,660 \approx 52.63$
* Looking at the options, 52.63 is closest to 52 (or it might be rounded down depending on the specific textbook's rounding rules, but 52 is the best fit among the choices provided).
* Answer: b) 52 km²
3. What is the process of releasing the semen?
* Reasoning:
* Ejaculation is the discharge of semen from the male reproductive tract.
* Ovulation is the release of an egg from the female ovary.
* Menstruation is the shedding of the uterine lining in females.
* Transcription is a biological process involving DNA and RNA.
* Answer: a) ejaculation
4. Which organism was first to appear on Earth?
* Reasoning: Evolution generally moves from water to land.
* Fishes appeared first in the oceans (hundreds of millions of years ago).
* Amphibians evolved from fish to live on land.
* Reptiles evolved from amphibians.
* Birds evolved from reptiles (dinosaurs).
* Therefore, fishes are the oldest group on this list.
* Answer: c) fishes
5. Which gland is also known as the master gland?
* Reasoning: The pituitary gland is called the "master gland" because it produces hormones that control other glands in the body (like the thyroid and adrenal glands). Parathyroid controls calcium, and the pineal gland regulates sleep cycles. Parathormone is a hormone, not a gland itself.
* Answer: d) pituitary
6. Which of the following is not caused by the autonomic nervous system?
* Reasoning: The autonomic nervous system controls things your body does automatically without you thinking about them (like heartbeat, digestion, breathing).
* Options A, B, and D describe automatic processes (energy expenditure, consumption, working without thought).
* Option C says "regulates activities under conscious control." Conscious control means you have to think to do it (like moving your arm or walking). This is handled by the *somatic* nervous system, not the autonomic one.
* Answer: c) regulates activities under conscious control
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Final Answer:
1. a
2. b
3. a
4. c
5. d
6. c
Parent Tip: Review the logic above to help your child master the concept of bio worksheet.
