Mosquitoes can be controlled by preventing stagnation of water though they do not live in water. Why?
The phenomenon of water stagnation happens when the water can’t reach the surface of the soil because its empty spaces... View Article
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Which one is an oil yielding plant among the following ? (a) Lentil (b) Sunflower (c) Cauliflower (d) Hibiscus
Sunflower oil is produced from the seeds of sunflower. Sunflower seeds are rich in protein and yield a high quality... View Article
Which one of the following is not a bacterial disease? (a) Cholera (b) Tuberculosis (c) Anthrax (d) Influenza
(d) Influenza Explanation The flu, also called Influenza, is a viral disease that affects the nose, throat and the lungs.... View Article
Which of the following is not a greenhouse gas? (a) Methane (b) Carbon dioxide (c) Carbon monoxide (d) Ammonia
d) Ammonia Explanation Among these options, ammonia is not a green house gas where rest of them are considered as... View Article
Amphibians do not have the following (a) Three chambered heart (b) Gills or lungs (c) Scales (d) Mucus glands
c) Scales Explanation These can live both on land and in water. They are ectothermic animals, found in a warm... View Article
Which of the following are covered by a single membrane? (a) Mitochondria (b) Vacuole (c) Lysosome (d) Plastid
Answer: (c) Lysosome. Lysosomes Lysosomes comprise around fifty different degradative catalysts that can hydrolyze proteins, DNA, RNA, polysaccharides, and lipids... View Article
Why do plant cells have an additional layer surrounding the cell membrane? What is this layer known as?
Plants are immobile and hence, need protection against variations in temperature, high wind speed, atmospheric moisture, etc. These variations can... View Article
Which substance is formed by the carbonisation of dead vegetation?. (a) coal (b) coke (c) coal gas (d) coal tar
Coal is formed by the carbonisation of dead vegetation. Coal is a black hard rock, flammable in nature. It belongs... View Article
Give reasons for: Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
Meristematic cells are continuously dividing cells so they have a prominent nucleus and dense cytoplasm. But since these cells do... View Article
Draw a neat diagram of plant cell and label any three parts which differentiate it from an animal cell.
Diagram of plant cells and their three parts. (a) Nucleus: It determines the function and development of the cell (b)... View Article
In humans, the development of the fertilised egg takes place in the (a) ovary (b) testis (c) oviduct (d) uterus
c) Oviduct In a human early development of fertilized egg takes place in the fallopian tube ( oviduct ).The female... View Article
Freshly harvested grains must be dried before storing. State True or False. Correct the false statements.
True Freshly harvested grains must be dried before storing. True. If the grains remain moist they may get spoiled due... View Article
Poultry fowl are susceptible to the following pathogens (a) Viruses (b) Bacteria (c) Fungi (d) All of the above
d) All of the above Explanation Poultry fowl are susceptible to viruses, bacteria and fungi. Viral disease of poultry fowl... View Article
If a potted plant is covered with a glass jar, water vapours appear on the wall of glass jar. Explain why?
If a potted plant is covered with a glass jar, due to the process of transpiration water vapours appear on... View Article
Which kind of plastid is more common in (a) roots of the plant (b) leaves of the plant (c) flowers and fruits
(a) Roots of the plant contain leucoplast which are colourless plastids and act as storage of food. These are the... View Article
Cell wall of which one of these is not made up of cellulose? (a) Bacteria (b) Hydrilla (c) Mango tree (d) Cactus
(a) Bacteria Plant cells, in addition to the plasma membrane, have another rigid outer covering called the cell wall. The... View Article
Which one of the following term is not a part of the nucleus? (a) ribosome (c) chromosome (b) nucleolus (d) gene
Ribosome Ribosome is not a part of nucleus. They are found floating in the cytosol or attached to the endoplasmic... View Article
Karl Von Linne was involved with which branch of science? (a) Morphology (b) Taxonomy (c) Physiology (d) Medicine
(b) Taxonomy Explanation Taxonomy is a science that deals with naming, describing and classification of all living organisms including plants.... View Article
In which group of animals, coelom is filled with blood? (a) Arthropoda (b) Annelida (c) Nematoda (d) Echinodermata
Arthropoda In Arthropoda, the coelom is filled with blood. The coelom is the space between the body wall and the... View Article
Water which is suitable for drinking is called soft water State true or false. Correct if wrong statement.
False. Water which is suitable for drinking is called potable water. Explanation Potable water is defined as the water that... View Article
