Plants without well-differentiated stem, root and leaf are kept in ___.
Thallophyte Explanation Thallophyte is the simplest of plants that do not have a well-differentiated body design. For example, Algae do... View Article
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Epithelial cells have a lot of intercellular spaces. (True or False)
False Epithelial cells have no intercellular spaces between them as they are tightly packed. The cells are held together by adhering... View Article
How are chromatin, chromatid and chromosomes related to each other?
Chromatin is a tangled fibrous mass made up of DNA and protein. The chromatin material condenses to form chromosomes during... View Article
In markets, eggs of birds are available but never eggs of dogs. Why?
Dogs are viviparous. Dogs does not lay eggs, it gives birth to puppies. Hence, dogs eggs are not available in... View Article
Name the unit in which the calorific value of a fuel is expressed.
kJ/kg is the unit in which the calorific value of a fuel is expressed. Calorific value is the amount of... View Article
Suggest some preventive measures for the diseases of poultry birds.
Poultry farming refers to the rearing of domesticated fowl (birds) for their meat and eggs. These birds include chicken, ducks,... View Article
Monera is divided into Archaebacteria and Eubacteria. (True or False)
True Explanation Monera is a kingdom that contains unicellular organisms with a prokaryotic cell organization (having no nuclear membrane), such... View Article
___ have tubular cells with perforated walls and are living in nature.
Sieve tubes It has tubular cells with perforated walls and are living in nature. In-plant anatomy, sieve tube elements, also... View Article
Name the different components of xylem and draw a living component?
The different components of xylem are- tracheids, vessel elements, xylem fibers and xylem parenchyma. Tracheids, vessel elements and xylem fibers... View Article
What steps would you suggest for the judicious use of fossil fuels?
Fossil fuels should be used judiciously because they are exhaustible and are present in limited amount in nature. Also, the... View Article
Write some important uses of the various constituents of petroleum.
Petroleum has been used in one form or another. It is an important substance across society, politics, technology including in... View Article
We say fossil fuels will last only for a few hundred years. Comment.
It takes a very long time for the formation of fossil fuels. It also requires specific conditions and it doesn’t... View Article
Polio drops are not given to children suffering from diarrhoea. Why?
Polio drops are not given to children suffering from diarrhoea as it is an oral vaccine and due to frequent... View Article
How do carbohydrates, proteins and fats get digested in human beings?
Carbohydrates – The digestion of carbohydrates occurs in the mouth, stomach and small intestine. In the mouth, saliva mixes with... View Article
What will happen if the mucus is not secreted by the gastric glands?
If the mucus is not secreted by the gastric glands then the stomach wall will be destroyed by the acid,... View Article
There is mass mortality of fishes in a pond. What may be the reasons ?
The mass mortality of fishes may have occurred due to following reasons, Thermal pollution (ii) Addition of poisonous (mercury) compounds... View Article
Epithelial tissue is protective tissue in animal body. (True or False)
True Epithelial tissue protects the body from physical, chemical and biological wear and tear. The skin is made of stratified... View Article
Name the hormone that is released by testes at the onset of puberty.
Testes secrete testosterone hormone at the onset of puberty Testosterone is a sex hormone that is secreted by the testes.... View Article
We do not sense any pain when we clip our nails or cut our hair. Why?
a) They are made up of dead cells Hairs and nails are made of dead tissues. Only the base of... View Article
Spinal cord originates from (a) cerebrum (b) medulla (c) pons (d) cerebellum
b) Medulla Explanation Medulla oblongata connects brains and spinal cord and hence spinal cord originates from the medulla. Brain is... View Article
