Biology Basics — Set 1
Biology · जीवविज्ञान की मूल बातें · Questions 1–10 of 40
Which scientist is credited with the discovery of the first living cell?
Correct Answer: C. Anton van Leeuwenhoek
Anton van Leeuwenhoek observed living cells like bacteria and protozoa using his improved microscope. While Robert Hooke discovered cells in cork, they were actually dead cell walls. Leeuwenhoek is often called the Father of Microbiology for his early work.
Which organelle is known as the 'Suicidal Bag' of the cell?
Correct Answer: B. Lysosome
Lysosomes are called suicidal bags because they contain digestive enzymes that can destroy the cell itself if it is damaged. These enzymes help in breaking down waste materials and cellular debris. Christian de Duve discovered this organelle in the mid-20th century.
What is the primary component of the plant cell wall?
Correct Answer: B. Cellulose
Cellulose provides structural strength and rigidity to the plant cell. It is a complex carbohydrate that humans cannot digest easily. Fungal cell walls, in contrast, are primarily made of chitin.
In the Five Kingdom classification system, which kingdom includes organisms like Amoeba and Paramecium?
Correct Answer: B. Protista
Kingdom Protista consists of unicellular eukaryotic organisms. Robert Whittaker proposed the five-kingdom system to better organize biological diversity. These organisms usually live in aquatic environments.
Which organelle is responsible for the synthesis of proteins within the cell?
Correct Answer: D. Ribosome
Ribosomes are the site of protein synthesis and are found in both prokaryotic and eukaryotic cells. They can be found floating freely in the cytoplasm or attached to the endoplasmic reticulum. They are often described as the cell's protein factories.
Which of the following is known as the 'Kitchen of the cell' in plants?
Correct Answer: B. Chloroplast
Chloroplasts are the sites where photosynthesis occurs to produce food for the plant. They contain the green pigment chlorophyll which captures light energy. These organelles are exclusive to plants and certain algae.
Which taxonomic group sits between 'Family' and 'Species' in the biological hierarchy?
Correct Answer: A. Genus
Genus is the taxonomic rank that groups together closely related species. In Binomial Nomenclature, the genus name is always written first with a capital letter. Carl Linnaeus established this hierarchical system for classifying life.
Which cell organelle is involved in the formation of spindle fibers during cell division?
Correct Answer: C. Centrosome
The centrosome helps organize the microtubules that pull chromosomes apart during division. It is primarily found in animal cells rather than plant cells. This organelle consists of two structures called centrioles.
What is the study of the classification of organisms called?
Correct Answer: A. Taxonomy
Taxonomy involves the naming, describing, and categorizing of all living organisms. It helps scientists communicate globally using a standardized naming system. Cytology, on the other hand, is specifically the study of cells.
Which of the following kingdoms contains only prokaryotic organisms?
Correct Answer: B. Monera
Kingdom Monera is comprised of bacteria and cyanobacteria which lack a true nucleus. These organisms are the most ancient and numerous forms of life on Earth. Most monerans reproduce through a process called binary fission.