Important Science Questions & Answers

Q1) Organism that cannot prepare their own food are called ____.

Ans:- Heterotrophic

Q2) _ are made of nitrogen containing compounds called amino acids.

Ans:- Protein

Q3) Bones becoming soft and bent also called as ‘Rickets’ due to the deficiency of-

Ans:- Vitamin D

Q4) _ is the process of converting the carbohydrates to alcohols and carbon dioxide using desirable microorganisms.

Ans:- Fermentation

Q5) First antibiotic ‘Penicillin’ was discovered by __.

Ans:- Alexander Fleming

Q6) _ is the process through which an animal keeps chewing the cud stored in its rumen.

Ans:- Rumination

Q7) Small intestine and Large intestine in the human body are in the ratio of ___

Ans:- 5:1

Q8)  is caused by a Protozoa.

Ans:- Malaria

Q9) A Special Structure that is sent to the host plant by a parasitic plant to absorb nutrients is called ___.

Ans:- Haustoria

Q10)  is a fire resistant fiber.

Ans:- Melamine

Q11) The most reactive non-metal is __.

Ans:- Phosphorus

Q12)  gas is liberated when an acid reacts with metal.

Ans - Hydrogen

Q13) Goldsmiths use __ to dissolve gold.

Ans:- Aqua Regia

Q14) Cyclones are monitored with the help of _.

Ans:- Satellites.

Q15) Litmus is a natural dye which is extracted from ____.

Ans:- Lichen

Q16)  is not present in an animal cell.

Ans:- Cell Wall

Q17) _ ensures the air passage to trachea and food passage into the oesophagus.

Ans:- Epiglottis

Q18) Gaseous exchange in the lungs takes place in ____.

Ans:- Alveoli

Q19) Estrogens, the female sex hormones are produced in the _.

Ans:- Ovaries

Q20) ____ are only present in the animal cells.

Ans:- Centrosome

Q21) Tricuspid valve and Mitral Valve are found in _.

Ans:- Heart

Q21) Yeast cell multiply asexually by the process of _.

Ans:- Budding

Q22) _ is a force which carries water from the ground up to the tip of a tree.

Ans:- Transpiration Pull

Q23) Major excretory products in the Human body is ___.

Ans. Urea

Q24) In a maize seed, Food is stored in _.

Ans:- Endosperm

Q25) 22+x is the number of ___ in the sperms of human being.

Ans:- Chromosomes

Q26) Alcohols can be produced by the hydration of ____.

Ans:- Alkenes

Q27) Zymase converts Starch into _.

Ans:- Glucose

Q28) Saponification of glycerides is the process of obtaining______

Ans:- Soaps

Q29) Ganga Action Plan was started in _.

Ans:- 1985

Q30) Amoeba shows _ kind of nutrition.

Ans:- Holozoic

Q31)  organ of our body vibrates to produce sound.

Ans:- Vocal Cords.

Q32) Sportsmen use shoes with spike to __.

Ans:- Increase Friction

Q33) An air bubble inside water behaves like ____.

Ans:- Concave lens

Q34) A ball bearing offers  friction.

Ans:- Rolling

Q35) Richter Scale is a unit of measuring _____.

Ans:- Intensity of earthquake

Q36)  is obtained from Coal Tars.

Ans:- Naphthalene Balls

Q37) Coal Tar consists about _ substance

Ans;  200

Q38) Image formed in a plane mirror undergoes ______.

Ans:- Lateral Inversion

Q39) An aqueous solution with ph-level zero is _

Ans:- Acidic

Q40) The impurities associated with the minerals used in metallurgy is called ____.

Ans:- Gangue

Q41) The concentration of Sulphide ore is done by ____ process.

Ans:- Froth Floatation

Q42) Resistivity of a metallic wire depends upon ____.

Ans:- nature of material

Q43) A myopic person can clearly see only ____

Ans:- Nearby objects

Q44) The Human eye forms the image of an object on ____.

Ans:- Retina

Q45) _ is responsible for bringing change in the focal length of the eye lens.

Ans:- Ciliary muscle

Q46) _ is used to correct Hypermetropia.

Ans:- Convex Lens

Q47) ___ discovered cell.

Ans:- Robert Hooke

Q48) Water makes up about _ % of human weight.

Ans:- 50

Q49) Audible range of a human ear is __.

Ans:- 20 Hz t0 20,000 Hz

50) Amoeba uses ____ for locomotion. 

Ans:- Pseudopodia. 

Q51) Atomic number of an element __ during Chemical reaction. 

Ans:- Remain constant 

Q52)Which organ of our body vibrates to produce sound?  

Ans:- Vocal cords  

Q53) Night blindness occurs due to the deficiency of ____.  

Ans. Vitamin A  

Q54) __ is the smallest single celled prokaryotes with cell wall.  

Ans. Bacteria  

Q55) Malaria is caused by a protozoan called .  

Ans. Plasmodium