All Free Biology MCQs with Answers

• A. Vacuole and Nucleoplasm
• B. Cytoplasm and Nucleoplasm
• C. Vacuole and stroma
• D. Vacuole and Cytoplasm

Explanation: Tonoplast is the membrane separating the Vacuole and Cytoplasm

• A. Chloroplast
• B. Chromoplast
• C. Leucoplast
• D. Amyloplast

Explanation: Chromoplasts are coloured protoplasts. They attract insects and cause pollination.

• A. Cisternae
• B. Cristae
• C. Mesosome
• D. Infolds

Explanation: The folds of the Inner Membrane of mitochondria are called Cristae

• A. Mitochondria
• B. Golgi Bodies
• C. Lysosomes
• D. Chloroplast

Explanation: The organelles that are spherical sacs, surrounded by a single membrane, and contain hydrolytic enzymes are "Lysosomes." Lysosomes are…

• A. Nucleus only
• B. Nucleolus only
• C. Nucleus & nucleolus only
• D. None of the above

Explanation: Nucleolus is responsible for the synthesis of ribosomal RNA and they are also responsible for storing the RNA.

• A. DNA polymerase
• B. Salivary amylase
• C. Pancreatic amylase
• D. DNA helicase

Explanation: The correct answer is DNA helicase since it is the only one whose final destination is inside the cell.

• A. Nuclear membrane
• B. Inner mitochondrial membrane
• C. Endoplasmic reticulum
• D. Plasma membrane

Explanation: Option B is correct since membranes are involved in ATP production (such as the internal membranes of mitochondria and chloroplasts)…

• A. Endocytosis
• B. Pinocytosis
• C. Phagocytosis
• D. Exocytosis

Explanation: Hormone secretion is always done by exocytosis. All the other options are used for other various processes inside of the cell.

• A. Chloroplasts
• B. Chromoplasts
• C. Leucoplasts
• D. All of them

Explanation: Option C is correct since the roots of plants contain 'leucoplast' which is colorless, plastids, and act as storage of food.Option A is…

• A. Chloroplasts
• B. Chromoplasts
• C. Leucoplasts
• D. All of these options are correct

Explanation: c) Leucoplasts:Leucoplasts are a third type of plastid found in plant cells.

• A. 0.5 micrometer
• B. 1.5 micrometer
• C. 2 micrometer
• D. 1 micrometer

Explanation: Correct option is A. Peroxisomes are 0.1 -- 0.5μm in diameter and are bound by single membranes that enclose dense matrices primarily…

• A. More offspring than can be supported
• B. Offspring according to the available resources
• C. Just the right amount of offspring
• D. Offspring to create more resources
• E. Less offspring than can be supported

Explanation: Explanation for this question will be added soon.

• A. Lamark
• B. Linnaeus
• C. Hardy-Weinberg
• D. Darwin

Explanation: The theory of natural selection was explored by 19th-century naturalist Charles Darwin.

• A. Ecosystem and habitat diversity
• B. Species diversity and ecosystem diversity
• C. Species diversity, genetic diversity and ecosystem diversity
• D. Species diversity only

Explanation: c) Species diversity, genetic diversity, and ecosystem diversity:This is the correct answer.

• A. All the environmental factors that determine where an organism lives
• B. All the food webs in an ecosystem
• C. The place where an organism lives
• D. The role that a species fulfills in a community

Explanation: d) The role that a species fulfills in a community:This is the correct definition of niche.

• A. Complete
• B. Incomplete
• C. Almost complete
• D. None of these

Explanation: Ecosystems with abiotic components, producers, consumers, and decomposers are considered as complete ecosystems.

• A. Prevent entry of ultraviolet rays
• B. Prevent rainfall
• C. Prevent heat to escape
• D. All given options are correct

Explanation: Greenhouse gases are gases in Earth's atmosphere that trap heat. They let sunlight pass through the atmosphere, but they prevent the heat…

• A. Prairies
• B. Savana
• C. Boreal
• D. Pampas

Explanation: The Pampas in Argentina are most well known for the great biodiversity in the area.

• A. Xerosere
• B. Hydrophytes
• C. Halophytes
• D. All

Explanation: Xerarch succession takes place in dry areas and the series progress from xeric to mesic conditions.

• A. Physiology
• B. Pulmonology
• C. Morphology
• D. Ecology

Explanation: Option A: Physiology is the study of the functions of living organisms.