Explanation

• Observation is the first step in the scientific method, which is used to solve biological problems.
• Scientists make observations about the natural world, notice patterns or phenomena, and ask questions about what they have observed.

The correct order of the scientific method is:

• Observation
• Question
• Hypothesis
• Prediction
• Experimentation
• Data analysis
• Conclusion

Last verified on 28-10-2026

Explanation

• Bronchitis is the inflammation of the bronchial tubes, which carry air to and from the lungs.
• It commonly causes coughing, mucus production, chest discomfort, and sometimes shortness of breath.
• Bronchitis may be acute, often caused by viruses, or chronic, commonly associated with long-term exposure to irritants such as cigarette smoke.

Last verified on 28-10-2026

Explanation

• A pair of unlike parallel forces (forces that act in opposite directions) with different lines of force produce a couple.
• It is also known as a moment or torque.
• This is a rotational force that tends to cause rotation around a pivot point or axis.

Last verified on 26-10-2026

Explanation

• Most skull bones are connected by fixed joints, also called suture joints.
• These are fibrous, immovable joints that hold the skull bones firmly together and protect the brain.
• The lower jaw is an exception because it forms a movable joint with the skull.

Last verified on 23-10-2026

Explanation

• Carbohydrates are the fastest and main source of energy.
• They are quickly converted into glucose in the body.
• Glucose is used immediately for energy production.
• They provide instant fuel for brain and muscles.

Last verified on 14-05-2026

Explanation

• The number of spark plugs needed in a diesel engine is zero
• Diesel engines use compression ignition instead of a spark.
• Air is compressed until it is hot enough to ignite the fuel.
• Instead of spark plugs, they use glow plugs to warm the engine when cold

Explanation

• Amino acids are the building blocks of proteins.
• Proteins are formed when amino acids join together by peptide bonds.
• Proteins are essential for growth, repair, and body functions.
• There are 20 standard amino acids used to make proteins.

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Explanation

• Biodegradable waste is waste that microorganisms, such as bacteria and fungi, can break down naturally.
• Vegetable waste from farms, including leaves, stems, and spoiled vegetables, decomposes naturally.

Last verified on 16-10-2026

Explanation

• Apomixis: Seed formation without fertilization, meaning the fusion of male and female gametes does not occur.
• The offspring are often genetically identical to the parent plant because the seed develops without normal sexual reproduction.

Additional information:

• Parthenocarpy: Fruit development without fertilization; it commonly produces seedless fruits.
• Grafting: A vegetative propagation method in which parts of two plants are joined.
• Scion: The shoot or stem piece joined to the rootstock during grafting.

Last verified on 16-10-2026

Explanation

• Gymnosperms are plants whose seeds are not enclosed inside an ovary or fruit.
• The word gymnosperm means “naked seed.”
• Examples include pine, cycas, and fir.
• Their seeds are often borne on the scales of cones.

Last verified on 16-10-2026