Biology MCQ Question with Answer

Explanation:  Chloroplast is considered a cell within a cell because it contains its own DNA. Hence, it is a semi-autonomous organelle. It helps in photosynthesis.

Explanation: Chlorofluorocarbon is a halogenated gas that is used in refrigerators. CFCs depute ozone in the upper atmosphere. Montreal Protocol banned the CFC because it is harmful to ozone depletion.

Explanation: Diabetes mellitus is caused due to deficiency of insulin hormone. The hormone insulin maintains the blood sugar in the body. The deficiency of insulin in the human body causes to increase in the sugar level in the blood, which leads to Diabetes mellitus.

Explanation: Rootless plants are those plants that don’t have a root system. They develop rhizomes refer to as rootless plants. e.g. Ginger, Bermuda grass, Bamboo etc. Underground stem work as root.

Explanation:  Mitochondria contain enzymes for cellular respiration. Mitochondria are known as the powerhouse of the cell. These are organelles that act like a digestive system that take nutrients, breaks them down, and creates energy for the cell. The process of creating cell energy is known as cellular respiration. Most of the chemical reactions involved in cellular respiration happen in the mitochondria.

Explanation: Probiotics are living microorganisms that to be healthy for the host organisms. Lactic acid bacteria, bifid bacteria are common types of microbes used as probiotics. Certain yeast and Bacilli may also be useful. Probiotics are commonly consumed as a part of fermented food with specially added active live cultures such as yoghurt or as dietary supplements.

Explanation: Sea hare belongs to phylum Mollusca. They are soft-bodied organisms covered with a protein shell. The scientific name of the hare is Aplysia California. 516 Biology Rakesh Yadav Readers Publication Pvt. Ltd.

Explanation:  Among the given example only the nucleus is a cell organelle. Which bears DNA the genetic material which carries the characteristics which are transported from the parent to offspring.

Explanation: Polyunsaturated fatty acid is an antioxidant, which helps in building tissues.

Explanation: Ischemia is a medical condition during which heart and brain muscles does not get enough oxygen. Ischemia usually happens due to a shortage of blood and oxygen caused by narrowing or blockage of arteries

Explanation: Tapeworms are hermaphrodites (both male and female reproductive organs present).

Roundworms are unisexual (separate sex).

Filaria is caused by Wuchereria bancrofti which is a parasitic nematode.

A Guinea worm is a long and very thin nematode, not an annelid.

Explanation:  Calcium activates enzymes, is a structural component of cell walls, influences water movement in cells and is necessary for cell growth and division.

​​Potassium helps in energy flow, manganese is involved in enzyme synthesis and phosphorus makes up the backbone of genetic materials like DNA and RNA.

Explanation: Ligaments are the connective tissues that connect two bones together. It helps in the easy movement of bones.

Explanation: Breast bone – Sternum

Collar bone – Clavicle

Knee Cap – Patella

Shoulder Blade – It connects the humerus (upper arm bone) with the clavicle. It is known as scapula.

Explanation: Polynucleotide is a linear polymer whose molecules are composed of many nucleotide units, constitute a section of a nucleic acid molecule. Polynucleotide constitutes to form a gene.

Explanation:  Collenchymas provides malleability and flexibility to certain parts of the plants. ​​Parenchyma is considered to be the soft tissue that makes most of the cell and sclerenchyma is the dead tissue that makes up the fibre and provides rigidity to the cell.

Explanation: Iodine solution test is done for the presence of starch any form of carbohydrate turns blue-black when exposed with iodine solution. The brown colour of an aqueous solution of triiodide anion forms the intermolecular charge transfer complies.

Explanation: Oxygen liberates after the splitting of water molecules into hydrogen and oxygen. In photosynthesis, this liberates oxygen in the atmosphere.

Explanation:  Blood plasma cells form 55 – 60% by volume of blood. Antibodies and some other substances such as lysozyme and properdin always occur in the plasma. They serve to destroy bacteria, viruses and toxic substances that may enter into the blood from outside or from body tissues.

Explanation: The blooming of desert plants is controlled by low temperature.

Explanation: ‘Genera Plantarum’ is a collection of a brief descriptions of the 935 plant genera, this book was written by Swedish Naturalist Carl Linnaeus (1707-1778).

Explanation: Spirogyra and Ulothrix are green algae, not blue algae. The chameleon can see in both the direction forward and backwards at the same time.

Explanation: The presence of any substance that is harmful or poisonous to the environment is called pollution. Sewage and garbage are the largest sources of pollution in the world. Sewage and garbage consist of industrial waste and human waste or surface runoff from rainwater.

Explanation:  As AB is the universal recipient, B thus donate blood to these two groups of people (B and AB)

Explanation: Ether is used as anaesthesia at the time of surgery to prevent pain.

Atropine is used as eye drops to dilate the pupil before eye examination.

Nitroglycerine is widely used in the treatment of the heart.

Pyrethrin is biodegradable, a non-persistent pesticide that is used to kill mosquitoes, fleas and other insects.