All Free Biology MCQs with Answers

1091. Acetabularia mediterranea has a cap of _________ ?

• A. Regular shape
• B. Circular shape
• C. Triangular shape
• D. Cone shape

Explanation: Acetabularia mediterranea develops a cap with a regular shape, which distinguishes it from species with differently shaped caps. Students may choose b because the cap is broadly rounded or umbrella-like, but “regular” describes its characteristic form more accurately than the general term “circular.”

1092. Acetabularia is a kind of __________ ?

• A. Fungi
• B. Protist
• C. Multicellular alga
• D. Unicellular alga

Explanation: Acetabularia is a giant unicellular green alga, so a single cell performs all of its life processes despite its large size. Students may choose c because it is visible to the naked eye and has specialized-looking regions, but visible size does not make it multicellular.

1093. Under unfavourable conditions, the Amoeba reproduces by ________ ?

• A. Binary fission
• B. Conjugation
• C. Encystment
• D. Endomixis

Explanation: Amoeba survives unfavourable conditions by forming a resistant cyst, a process called encystment. Students may choose binary fission because it is Amoeba's usual method of reproduction, but binary fission occurs mainly under favourable conditions.

1094. The number of daughter paramecia produced following conjugation is _______ ?

• A. 8 from one conjugant
• B. 8 from two conjugants
• C. 16 from two conjugants
• D. 8-16 from two conjugants

Explanation: After conjugation, each of the two Paramecium conjugants generally undergoes two successive divisions, producing four daughter paramecia from each and eight from the pair. Students may choose 16 by assuming that each of four products divides again, but the standard stated result is eight daughter paramecia from two conjugants.

1095. Amoeba secretes digestive enzymes to hydrolyse _________ ?

• A. Starch
• B. Sugar
• C. Proteins
• D. All of these and fats

Explanation: Amoeba secretes digestive enzymes into its food vacuole, where proteins, carbohydrates and fats are hydrolysed into simpler substances. Students may choose proteins because proteases are often emphasised, but Amoeba digests several food classes, not proteins alone.

1096. Ingestion of some water with food in Amoeba takes place by the process of ______ ?

• A. Endosmosis
• B. Pinocytosis
• C. Phagocytosis
• D. None of these

Explanation: Amoeba engulfs solid food along with some surrounding water by phagocytosis, forming a food vacuole. Students may choose pinocytosis because it involves taking in liquid, but pinocytosis is uptake of fluid droplets rather than engulfment of a food particle.

1097. Which among the following is an Autotroph _________ ?

• A. Butterfly
• B. Mushroom
• C. Fish
• D. Algae

Explanation: Algae are generally autotrophic because they contain chlorophyll and manufacture organic food by photosynthesis. Students may choose mushroom because it is a plant-like organism, but fungi lack chlorophyll and obtain food heterotrophically.

1098. Which of the following is the less important organ in human body?

• A. Hair
• B. Appendix
• C. Hip bone
• D. Navel

Explanation: The appendix is considered a vestigial organ and is not essential for survival, although it may have some immune and microbial functions. Students may choose the navel because it is a scar left after birth, but it is not usually classified as an organ and the question conventionally targets the appendix.

1099. The life and activities of a cell is controlled by__________?

• A. cytoplasm
• B. nucleus
• C. vacuole
• D. mitochondria

Explanation: The nucleus contains the cell's DNA and regulates gene expression, so it directs growth, metabolism, and reproduction of the cell. Students may choose cytoplasm because many metabolic reactions occur there, but the overall control centre is the nucleus.

1100. Amoeba moves in water with the help of locomotory organs called_________?

• A. tube feet
• B. cilia
• C. pseudopodia
• D. flagella

Explanation: Amoeba moves by extending temporary cytoplasmic projections called pseudopodia, whose formation depends on cytoplasmic streaming. Cilia and flagella are permanent hair-like or whip-like structures, so students may choose one of them by assuming every microscopic organism uses the same locomotory organ.