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(1) Differentiate between microsporogenesis and megasporogenesis. (2) Which type of cell division occurs during these events? (3) Name the structures formed at the end of these two events.

Answer: (1) The difference between microsporogenesis and megasporogenesis is listed below. Microsporogenesis Megasporogenesis... View Article

Phenols do not respond to which of these tests? (1) Ferric chloride test (2) Litmus test (3) Bromine test (4) Nessler’s reagent test

Answer: (4) The reagent of Nessler is a mercury(II) iodide (HgI2) solution in potassium iodide and potassium hydroxide, named after the German... View Article

What is the action of the Nessler’s reagent on ammonia? (1) Brown ppt. (2) Blue ppt. (3) Black ppt. (4) Green ppt.

Answer: (1) The reagent of Nessler is a mercury(II) iodide (HgI2) solution in potassium iodide and potassium hydroxide, named after the German... View Article

Name two chemicals used to disinfect water.

Answer: The two chemicals used in the disinfection of water are chlorine and ozone. Water disinfection Water disinfection involves eliminating... View Article

Define electronegativity? How does it differ from electron gain enthalpy ?

Answer: The tendency of an atom in a molecule to attract the shared pair of electrons towards itself is known as electronegativity. There is no... View Article

Curved surface area of a hemisphere is 905 1/7cm3 , what is its volume?

Answer: Given Curved Surface Area of the Hemisphere = 905 (1/7) Curved Surface Area of the Hemisphere = 6336/7 Cm2 C.S.A. of the Hemisphere =... View Article

Draw the diagram of human sperm and label its parts. Write few lines about it.

Answer: The head area or acrosome contains enzymes which help to enter the egg during fertilization. Mitochondria acts as a power-house of... View Article

State and prove converse of BPT (basic proportionality theorem)

Answer: Statement of basic proportionality theorem (BPT) According to this theorem, if a line divides any two sides of a triangle in the same... View Article

Choose the correct answer among the following: (1) Gastric juice contains (i) pepsin, lipase, and rennin (ii) trypsin, lipase, and rennin (iii) trypsin, pepsin, and lipase (iv) trypsin, pepsin, and renin (2) Succus entericus is the name given to (i) a junction between the ileum and large intestine (ii) intestinal juice (iii) swelling in the neck (iv) appendix

(1) Answer: (i) Gastric juice has pepsin, lipase, and rennin in it. Pepsin is secreted as pepsinogen in an inert form which is activated by... View Article

Edaphic factors are related to (1) Humidity (2) Soil texture (3) Rainfall (4) Wind velocity

Answer: (2) The edaphic factor is an abiotic factor related to the physical or chemical soil composition found in a given area. Very alkaline... View Article

Explain about composition of urine?

Answer: Urine is a liquid waste by-product of the body that the kidneys have secreted into a process called urination and excreted via the... View Article

For the complex ion [Fe (CN) 6]3- , state (1) The type of hybridisation. (2) The magnetic behaviour (3) The oxidation number of the central metal atom.

Answer: Consider the complex [Fe(CN)6]−3 (a) CN is a powerful field ligand and uses inner 3d-orbitals to form a low spin complex. As there are... View Article

Give an example of fibrous and globular protein.

Answer: They are two types of protein molecules fibrous proteins and globular proteins. They are insoluble and elongated and they are... View Article

Botanical names of Jowar and Rice are respectively (1) Oryza sativa and Pennisetum typhoides (2) Sorghum vulgare and Oryza sativa (3) Triticum aesativum and Pennisetum tyuphoides (4) Oryza sativa and Sorghum vulgare

Answer: (2) Sorghum Vulgare is a species of monocotyledonous plant belonging to the Poaceae family, commonly known as Jowar. It is an... View Article

Siliqua fruit is characteristic of family (1) Poaceae (2) Fabaceae (3) Brassicaceae (4) Asteraceae.

Answer: (3) Siliqua fruit develops from bi-carpellary, syncarpous, superior ovary initially one chambered but subsequently becomes two-chambered... View Article

Find the number of all onto functions from the set {1,2,3,….,n} to itself

Answer: Onto function could be explained by considering two sets, Set A and Set B, which consist of elements. If for every element of B, there... View Article

Balbiani rings are sites of (1) Lipid synthesis (2) Nucleotide synthesis (3) Polysaccharide synthesis (4) RNA and protein synthesis

Answer: (4) A Ring of Balbiani is a large puff of chromosome. Balbianirings are diffused uncoiled polytene chromosome regions which are RNA... View Article

Two plane wavefronts of light, one incident on a thin convex lens and another on the refracting face of a thin prism. After refraction at them, the emerging wavefronts respectively become (1) Plane wavefront and plane wave front (2) Plane wavefront and spherical wavefront (3) Spherical wavefront and plane wavefront (4) Elliptical wavefront and spherical wavefront

Answer: (3) As the waves reach the lens, the center of the wave first meets the glass and this part of the wave first slows down since light... View Article

Define reflex arc and its component.

Answer: Reflex or a reflex action is an involuntary action in response to a stimulus. This is a spontaneous action without thinking. For... View Article

Describe the various types of placentations found in flowering plants.

Placentation - Arrangement of ovule within the ovary is known as placentation. Various types of placentations found in flowering plants are (1)... View Article

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