Class 11 Biology MCQs | Everything You Need

Q1.The five kingdom system of classification was proposed by:

Q2.Bacteria are placed under the kingdom:

Q3.The cell wall of most fungi is mainly composed of:

Q4.Outside a living host cell, viruses behave as:

Q5.Lichens are formed through a symbiotic relationship between:

Q1.Plants that produce seeds but do not form fruits are called:

Q2.In the life cycle of a moss plant, the dominant and longer lasting phase is the:

Q3.Which plant group is often referred to as the amphibians of the plant kingdom?

Q4.Double fertilisation, involving the fusion of two male gametes with the egg and the polar nuclei, is a feature unique to:

Q5.In alternation of generations, the diploid, spore producing stage of a plant is called the:

Q1.Animals that possess a true coelom, lined on all sides by mesoderm, are called:

Q2.Organisms belonging to phylum Porifera are commonly known as:

Q3.The presence of a notochord at some stage of development is a defining feature of phylum:

Q4.Animals whose body parts are arranged around a central axis, like a wheel, show:

Q5.Segmentation of the body, seen both externally and internally, is a characteristic feature of phylum:

Q1.Water absorption in a root mainly takes place through the:

Q2.A leaf that has only a single, undivided blade attached to the petiole is called a:

Q3.The male reproductive whorl of a flower is called the:

Q4.The way flowers are arranged on the floral axis is termed:

Q5.A fruit that develops from the ovary without any prior fertilisation is called a:

Q1.The tissue mainly responsible for growth in the length of a plant is:

Q2.Xylem tissue in a plant is primarily responsible for the transport of:

Q3.The outermost protective layer covering a young plant part is called the:

Q4.Secondary growth in the girth of dicot stems is brought about mainly by the:

Q5.Stomata, the small pores that regulate gas exchange, are mainly found in the:

Q1.A group of cells that work together to perform a similar function is called a:

Q2.Which tissue contracts to bring about body movement in animals?

Q3.The frog is classified under the class:

Q4.Blood, despite being a fluid, is classified as a type of:

Q5.Cockroaches carry out gas exchange mainly through:

Q1.The cell was first observed and named by:

Q2.The organelle often referred to as the powerhouse of the cell is the:

Q3.Which cell organelle is directly involved in the synthesis of proteins?

Q4.According to the cell theory, new cells are formed from:

Q5.Photosynthesis within a plant cell takes place inside the:

Q1.Proteins are large molecules built from repeating monomer units called:

Q2.Which of these is a polysaccharide that plants use mainly to store energy?

Q3.The repeating structural units that make up nucleic acids are called:

Q4.Most enzymes, the biological catalysts that speed up reactions in cells, are made up of:

Q5.DNA differs chemically from RNA mainly because DNA contains the sugar:

Q1.DNA replication in a dividing cell takes place during the:

Q2.Mitosis produces daughter cells that are:

Q3.Meiosis reduces the chromosome number by half, producing cells that are:

Q4.Crossing over, the exchange of genetic material between homologous chromosomes, occurs during:

Q5.The stage of mitosis in which chromosomes line up at the equatorial plate of the cell is:

Q1.The green pigment mainly responsible for capturing light energy during photosynthesis is:

Q2.The light dependent reactions of photosynthesis take place in the:

Q3.The Calvin cycle, also called the dark reaction, occurs in the:

Q4.In C4 plants, the primary molecule that first accepts carbon dioxide is:

Q5.During photosynthesis, the oxygen released into the atmosphere comes from the splitting of:

Q1.Glycolysis, the first stage of respiration, takes place in the:

Q2.The end product formed at the completion of glycolysis is:

Q3.The Krebs cycle, a key stage of aerobic respiration, takes place in the:

Q4.Fermentation, which occurs in the absence of oxygen, is an example of:

Q5.Among the respiratory pathways, the one that yields the maximum amount of ATP is:

Q1.The plant hormone primarily responsible for cell elongation is:

Q2.Which hormone is most closely associated with the ripening of fruits?

Q3.Cytokinins are best known for promoting:

Q4.Abscisic acid is often called a stress hormone because it mainly helps plants:

Q5.The growth pattern in which the rate of growth first increases and then gradually decreases over time is called:

Q1.The actual exchange of oxygen and carbon dioxide in the human lungs occurs in the:

Q2.Oxygen is mainly carried in the blood bound to:

Q3.The muscle that plays a major role in breathing by changing the volume of the thoracic cavity is the:

Q4.Most of the carbon dioxide produced by tissues is transported in the blood as:

Q5.The centre that regulates the rhythm and rate of breathing is located in the:

Q1.The fluid, non cellular component of blood is called:

Q2.The human heart is made up of how many chambers?

Q3.The natural pacemaker of the human heart is the:

Q4.Blood vessels that carry blood away from the heart are called:

Q5.Lymph mainly helps the body by:

Q1.The functional and structural unit of the human kidney is the:

Q2.The main nitrogenous waste product excreted by humans is:

Q3.Filtration of blood in the kidney takes place mainly at the:

Q4.The hormone that regulates the reabsorption of water in the kidneys is:

Q5.Urine produced by the kidneys is temporarily stored in the:

Q1.The type of muscle found in the walls of internal organs such as the intestine is:

Q2.The protein filament that works together with myosin to bring about muscle contraction is:

Q3.The joint between the bones of the skull is an example of a:

Q4.The human skeleton is broadly divided into the axial skeleton and the:

Q5.The molecule that directly supplies energy for muscle contraction is:

Q1.The basic structural and functional unit of the nervous system is the:

Q2.The small gap across which a nerve impulse passes from one neuron to the next is called a:

Q3.The part of the brain mainly responsible for maintaining balance and coordinating posture is the:

Q4.The part of a neuron that carries the nerve impulse away from the cell body is the:

Q5.The autonomic nervous system mainly controls:

Q1.Hormones are chemical messengers that are secreted directly by:

Q2.The gland often called the master gland because it regulates the activity of several other endocrine glands is the:

Q3.Insulin, the hormone that helps regulate blood glucose levels, is secreted by the:

Q4.A deficiency of thyroxine in adults can lead to a condition known as:

Q5.Adrenaline, the hormone released during stressful or emergency situations, is secreted by the: