Why petrol is an exhaustible natural resource, whereas sunlight is not? Explain.
Petrol is a fossil fuel which is present in limited quantity in nature and can be exhausted by human activities,... View Article
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Give reason: Water is not used to control fires involving electrical equipment
Water is a good conductor of electricity. If used in fires involving electrical equipment, it will cause electric shocks or... View Article
Explain how the use of CNG in automobiles has reduced pollution in our cities
The use of CNG in automobiles has reduced pollution in our cities as it is a cleaner fuel as compared... View Article
Fill in the boxes given in Fig. with appropriate characteristics/plant group (s)
Solution: a) Thallophyte b) Vascular tissue without specialization c) Pteridophyte d) Phanerogams e) Bare naked seeds f)Angiosperm Seeds with two... View Article
Name the energy currency in the living organisms. When and where is it produced?
ATP (Adenosine triphosphate) is the energy currency in living organisms. It is produced at the end of respiration and is... View Article
How is the life of organisms living in water affected when water gets polluted?
Water pollution can be defined as the contamination of water bodies. Water pollution is caused when water bodies such as rivers,... View Article
Well-defined nucleus is absent in (a) blue green algae (b) diatoms (c) algae (d) yeast
a) Blue-green algae Explanation Cyanobacteria lack a membrane-bound nucleus, mitochondria, Golgi apparatus, chloroplasts, and endoplasmic reticulum like all other prokaryotes.... View Article
Cork cells possesses___on their walls that makes it impervious to gases and water.
Cork cells possess suberin on their walls that makes it impervious to gases and water. Suberin is a wax like... View Article
Cheek cells do not have _______ (a) cell membrane (b) nucleus (c) golgi apparatus (d) plastids
(d) plastids The cells of the basal mucosa which are composed of squamous epithelial cells are commonly thought of as... View Article
Which zone of a flame does a goldsmith use for melting gold and silver and why?
The goldsmith uses the outermost zone of the flame to use for melting gold and silver because it is the... View Article
The sex hormones,_______________________ and estrogen are responsible for the development of __________ characters.
(c) The sex hormones, Testosterone, estrogen and estrogen are responsible for the development of secondary sexual characters. Sex hormones play... View Article
Reproduction by budding takes place in (a) hydra (c) paramecium (b) amoeba (d) bacteria
a) Hydra Reproduction in all the given organisms takes place through asexual methods. Hydra reproduces by the formation of buds... View Article
Growing different crops on a piece of land in pre-planned succession is known as______.
crop rotation Explanation In this pattern, different crops are grown on the same land in preplanned succession. The crops are... View Article
Name any two groups of micro-organisms from which antibiotics could be extracted.
Bacteria and fungi Explanation The two groups of micro-organisms are Bacteria (Neomycin) and Fungi (Penicillin) from which antibiotics could be... View Article
5-Kingdom classification is given by (a) Morgan (b) R. Whittaker (c) Linnaeus (d) Haeckel
(b) R. Whittaker Explanation R.H. Whittaker proposed a five kingdom classification system. The five kingdoms are Monera, Protista, Fungi, Plantae,... View Article
Real organs are absent in (a) Mollusca (b) Coelenterata (c) Arthropoda (d) Echinodermata
b) Coelenterata Explanation Coelentrates are multicellular, diploblastic and acoelomate animals having tissue level of organization i.e., they lack true organs,... View Article
Skeleton is made entirely of cartilage in (a) Sharks (b) Tuna (c) Rohu (d) None of these
a) Sharks Explanation Fishes are classified into two groups: Chondrichthyes (cartilaginous endoskeleton) and Osteichthyes (bony endoskeleton) Shark belongs to Chondrichthyes.... View Article
Insufficient production of __________ in the tadpoles leads to their incomplete development.
Insufficient production of thyroxine in the tadpoles leads to the incomplete development. The process of growth and development is regulated... View Article
A ____________ process in which a substance reacts with __________ to give off heat is called combustion.
A chemical process in which a substance reacts with oxygen to give off heat is called combustion. Explanation A chemical... View Article
While driving what are the tips we must follow to save petrol/ diesel/natural gas?
Compared to diesel and even to petrol, natural gas creates far less nitrogen oxides (NOx) and particulate matter (PM) when... View Article
