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Mr. Dubey • 102.44K Points
Coach Biology

Q. Which is NOT a product of photosynthesis (light-dependent and light-independent reactions combined)?

• (A) Glucose
• (B) Oxygen
• (C) Carbon dioxide
• (D) Water (net production)

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Correct answer - Option (C)

Explanation:

Photosynthesis consumes carbon dioxide and water to produce glucose and oxygen (net). CO2 is a reactant, not a product. While water is used in light reactions, some processes release water in other contexts but overall CO2 is not produced.

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Mr. Dubey • 102.44K Points
Coach Biology

Q. What is the basic unit of structure and function in all living organisms?

• (A) Tissue
• (B) Organ
• (C) Cell
• (D) Organ system

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Correct answer - Option (C)

Explanation:

The cell is the fundamental unit of life; tissues, organs, and organ systems are higher-level assemblies of cells. Therefore, cell is the correct and most basic unit.

M

Mr. Dubey • 102.44K Points
Coach Biology

Q. Which hormone regulates blood glucose by lowering it when levels are high?

• (A) Glucagon
• (B) Insulin
• (C) Adrenaline
• (D) Cortisol

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Correct answer - Option (B)

Explanation:

Insulin, produced by pancreatic beta cells, lowers blood glucose by promoting cellular uptake and storage. Glucagon raises blood glucose, adrenaline increases glucose availability in stress, and cortisol raises blood sugar during long-term stress.

M

Mr. Dubey • 102.44K Points
Coach Biology

Q. Which type of organism obtains energy by consuming other organisms?

• (A) Autotroph
• (B) Producer
• (C) Heterotroph
• (D) Phototroph

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Correct answer - Option (C)

Explanation:

Heterotrophs obtain energy and carbon by consuming organic matter (other organisms). Autotrophs/producers make their own organic compounds (e.g., via photosynthesis). Phototrophs use light as an energy source but can be autotrophs or heterotrophs depending on carbon source.

M

Mr. Dubey • 102.44K Points
Coach Biology

Q. Which of the following best describes natural selection?

• (A) Organisms evolve traits because they want them
• (B) Individuals change their DNA to adapt during their lifetime
• (C) Differential survival and reproduction of individuals with favorable traits
• (D) All species remain unchanged over time

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Correct answer - Option (C)

Explanation:

Natural selection is the differential survival and reproduction of organisms due to variation in heritable traits. Organisms do not 'want' traits; individuals generally do not change their DNA in response to needs within a lifetime (that would be Lamarckian), and species do change over time via evolution, so options 1, 2, and 4 are incorrect.

M

Mr. Dubey • 102.44K Points
Coach Biology

Q. Antibiotics are effective against which type of pathogen?

• (A) Viruses
• (B) Fungi
• (C) Bacteria
• (D) Prions

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Correct answer - Option (C)

Explanation:

Antibiotics target bacteria (their cell walls, protein synthesis, etc.). They are not effective against viruses (which require antivirals), fungi (treated with antifungals), or prions (abnormal proteins) — these require different treatments.

M

Mr. Dubey • 102.44K Points
Coach Biology

Q. Which macromolecule serves as the primary long-term energy storage in animals?

• (A) Glycogen
• (B) Starch
• (C) Fat (lipids)
• (D) Protein

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Correct answer - Option (C)

Explanation:

Fats (lipids) store the most energy per gram and serve as long-term energy reserves in animals. Glycogen is a short-term carbohydrate storage in animals. Starch is plant storage, and protein is used mainly for structure and enzymes, not primary energy storage.

M

Mr. Dubey • 102.44K Points
Coach Biology

Q. Which immune cells produce antibodies?

• (A) T lymphocytes (T cells)
• (B) B lymphocytes (B cells) / plasma cells
• (C) Macrophages
• (D) Neutrophils

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Correct answer - Option (B)

Explanation:

B cells differentiate into plasma cells that secrete antibodies specific to antigens. T cells assist or kill infected cells but do not secrete antibodies. Macrophages phagocytose pathogens, and neutrophils are innate immune phagocytes — none primarily produce antibodies.

M

Mr. Dubey • 102.44K Points
Coach Biology

Q. Which process results in genetic variation by exchanging segments between homologous chromosomes during meiosis?

• (A) Independent assortment
• (B) Crossing over (recombination)
• (C) DNA replication
• (D) Binary fission

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Correct answer - Option (B)

Explanation:

Crossing over during prophase I of meiosis exchanges DNA between homologous chromosomes, creating new allele combinations. Independent assortment also creates variation by random segregation of chromosome pairs, but it does not exchange segments. DNA replication copies genetic material; binary fission is a form of asexual reproduction in prokaryotes.

M

Mr. Dubey • 102.44K Points
Coach Math

Q. How many degrees are there in a circle?

• (A) 180
• (B) 220
• (C) 360
• (D) 90

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Correct answer - Option (C)

Explanation:

A circle has 360 degree.