The instrument used to examine a person’s digestive tract is called_____.
(A) Oscilloscope
(B) Microscope
(C) Endoscope
(D) Radiograph
______ is used in yellow lamp street lights.
(A) Neon
(B) Nitrogen
(C) Phosphorous
(D) Sodium
Curd contains mainly______acid.
(A) Benzoic
(B) Fumaric
(C) Lactic
(D) Malic
Which of the following nutrients do NOT provide energy for animals?
(A) Fats
(B) Carbohydrates
(C) Vitamins
(D) Proteins
Vitamins do not provide energy as they are not stored in our bodies.
Which of the following acids is used in car batteries?
(A) Nitric acid
(B) Hydrochloric acid
(C) Sulphuric acid
(D) Hydrofloric acid
sulphuric acid is used in car batteries.
The science that deals with the relationship of various organisms with their environment is known as?
(A) anthropology
(B) economics
(C) ecology
(D) geology
Ecology is the study of the relationships between living organisms, including humans and their physical environment. The German scientist Earnst Haeckel was the first to use this word in 1869.
World Environmental Day is celebrated every year on:
(A) 5 May
(B) 5 June
(C) 5 July
(D) 18 July
World Environment Day is celebrated on June 5 every year to remind people to save nature and the earth by stopping their non-environmentally friendly activities. Let's know more about this day, its history, significance, and theme.
Why it is not advisable to sleep under a tree at night?
(A) Release of less oxygen
(B) Release of more oxygen
(C) Release of carbon dioxide
(D) Release of carbon monoxide
Sleeping under a tree is not advisable at night, since photosynthesis does not occur, oxygen is not being produced by the trees. In addition to this, the trees continue respiring thereby causing the amount of carbon dioxide to be increased and the amount of oxygen to be reduced.
Which one of the following organisms has a role in converting nitrates to free nitrogen?
(A) Pseudomonas
(B) Nitrosomonas
(C) Nitrobacter
(D) Rhizobium
Nitrates are reduced back into nitrogen in the soil by a process called denitrification. This process is performed by bacteria like Pseudomonas denitrificans, etc.
Which of the following has a very strong aroma of the fruit?
(A) Ethyl acetate
(B) Methanol
(C) Methyl chloride
(D) Methanoic acid
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