The acid present in curd/sour milk is (1) Acetic acid (2) Formic acid (3) Lactic acid (4) Hydrochloric acid
Answer: (3) Lactic acid Explanation The curd is produced due to the presence of reaction between lactic acid bacteria and... View Article
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Clinging roots are found in (1) Orchids (2) Trapa (3) Podostemon (4) Screwpine
Answer: (1) The root is an underground part of the plant that absorbs water and minerals from the soil and... View Article
Five years ago, A’s age was four times the age of B. Five years hence, A’s age will be twice the age of B. Find their present ages.
Answer: Let us consider B’s age = X Then A’s age = 4X Five years ago ⇒ A’s age =... View Article
The dominant phase in the life cycle of Funaria is (1) Protonema (2) Leafy gametophyte (3) Spore mother cells (4) Sporophyte
Answer: (2) Funaria is non-vascular plants which are found on land. They require water for survival and reproduction. They are... View Article
The microsporophyll of Cycas represents a (1) Male gamete (2) Stamen (3) Pollen grain (4) Pollinium
Answer: (2) Stamen is the male reproductive organ and is also known as Androecium. It consists of two parts known... View Article
If AB=A and BA=B, then which of the following is/are true? (1) A is idempotent (2) B is idempotent (3) At is idempotent (4) None of the above
Answer: (1) A is idempotent (2) B is idempotent (3) At is idempotent Given AB=A and BA=B Consider AB = A... View Article
Photochemical smog consists of excessive amount of X in addition to aldehydes, ketones, PAN etc. X is (1) Methane (2) Carbon monoxide (3) CArbon dioxide (4) Ozone
Answer: (4) Photochemical smog or summer smog is a type of smog that is produced when UV light originating from... View Article
What happens when rheo leaves are boiled in water first and then a drop of sugar syrup is put on it?
Answer: On boiling, the cells of Rheo leaves die. If we put sugar solution after the death of leaf cells... View Article
Which part of flowering plant contains sporogenous tissue (1) Stamen (2) Pollen (3) Microspores (4) Young anthers.
Answer: (4) Sporogenous tissue is located at the centre of each microsporangium in a young anther. With the development of... View Article
Oxygenated blood is carried by (1) Pulmonary artery (2) Pulmonary vein (3) Hepatic portal vein (4) Renal vein
Answer: (2) The heart is the main organ involved in blood circulation. Arteries carry oxygenated blood away from the heart... View Article
What are synthetic detergents? Give example
Answer: A synthetic detergent is any synthetic material apart from soap, that is an effective cleanser and works equally well... View Article
At which place in eye, image is formed of a person is far-sightedness (hypermetropia) ? (1) On retina (2) Behind the retina (3) Infront of retina (4) In lens of eye
Answer: (2) If an individual is far-sighted the image is created behind the retina.
What is the role of calcium in muscle contraction?
Answer: During muscle contraction, the thin filaments slide over the thick filaments. A signal sent by the central nervous system... View Article
What is dispersion of white light? What is the cause of such dispersion? Draw a diagram to show the dispersion of white light by a glass prism.
Answer: Prism is a three-dimensional solid object in which the two ends are identical. It is the combination of the... View Article
Draw a labelled diagram of the longitudinal section of a flower.
Answer: Flowers are the reproductive part of a plant. They are not only involved in reproduction but are also a... View Article
How is a pinnately compound leaf different from a palmately compound leaf?
Answer: The difference between the pinnately compound leaf and palmately compound leaf is given below. Pinnately Compound Leaf Palmately Compound... View Article
Write any 4 characteristic features of homologous series of organic compounds?
Answer: The compounds in solid, liquid or gaseous state which contain carbon in its molecule are known as organic compounds.... View Article
Make a lactometer with ball point refill. What would you do to make the refill stand vertically straight?
Answer: Lactometer is a small glass instrument that is used to test the purity of the milk. It works on... View Article
Explain the process of transcription in prokaryotes. How is the process different in eukaryotes?
Answer: Transcription is the first step of gene expression that involves the formation of RNA molecules from DNA. Transcription in... View Article
Aqueous solution of borax is (1) Neutral (2) Acidic (3) Alkaline (4) Strongly acidic
Answer: (3) Borax is a salt of weak boric acid and strong sodium hydroxide base. The other name of borax... View Article
