Biology

Radial, Conjoint and Concentric Vascular Bundles Collateral and Bicollateral Vascular Bundles Open and Closed Vascular Bundles Amphicribral and Amphivasal Vascular Bundles OR Hadrocentric and Leptocentric Vascular Bundles

Taxis = arrangement and nomos = law Taxonomy is the study of principles and procedures of classification In other words forming the rules for classification known as taxonomy This word was proposed A. P. de. Candolle in his book “Theories elementaire de la botanique” (Theory of elementary botany) Taxonomy includes study of: Identification:An organism is

Vestigial organs of man are? 1. Underdeveloped muscles of ear 2. Small intestine 3. Pinna 4. Teeth Answer : Underdeveloped muscles of ear Explanation: Underdeveloped muscles of ear are considered vestigial. Other 5 are: wisdom teeth; appendix; the tail bone; body hair; and the semilunar fold (plica semilunaris) in the corner of the eye.

Ascorbic acid supplemented food reduces risk of? 1. Rickets 2. Pellagra 3. Scurvy 4. Beriberi Answer: Scurvy Explanation: Ascorbic acid is Vitamin C and it reduces the risk of Scurvy. Rickets : due to the vitamin D deficiency Pellagra : due to the niacin (vitamin B3) or tryptophan deficiency Beriberi : due to the thiamin

A plant cell is distinguished from the cells of other organisms by its cell wall, chloroplasts, and central large vacuole. The cell wall and central vacuole work together to give the cell rigidity. The plant cell wall is mainly made of cellulose(the most abundant macromolecule present on Earth). Besides cellulose, hemicellulose, pectin, lignin, and proteins

Ammonia is toxic and needs to be eliminated from the body: In our body, ammonia is produced by the breakdown of amino acids. Bacteria present in our gut also produce ammonia. Too much ammonia in the blood can be toxic. Briefly, the urea cycle removes ammonia from the blood, and urea produced in this cycle

Question: Adjacent epithelial cells are held together by means of? A. Liposomes B. Glyoxisomes C. Desmosomes D. Microsomes Answer : C. Desmosomes Explanation: Adjacent epithelial cells are held together by the means of Desmosomes. A desmosome (macula adherens, plural: maculae adherentes) is a cell structure specialized for cell-to-cell adhesion.

The enzyme that catalyzes the decomposition of adenosine triphosphate (ATP) into adenosine diphosphate (ADP) and inorganic phosphate (Pi). Question: ATPase activity found in? A. Myosin filament B. Actin filament C. Both D. None Answer: A. Myosin filament Explanation: Myosin filaments have ATPase activity. The enzyme that catalyzes the reaction from ATP to ADP by hydrolysis,

Question : Classification of plants based on chromosome number is? 1. Numerical taxonomy 2. Biochemical taxonomy 3. Cytotaxonomy 4. All of the above Explanation: Cytotaxonomy : Based on cellular structure/ information e.g. chromosome number/ pattern during cell division. Note: Karyotaxonomy – Based on characters of nucleus and chromosomes inside it.