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Which of the following statement(s) is (are) true about respiration? (i) During inhalation, ribs move inward and diaphragm is raised (ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from the blood into the alveolar air (iii) Haemoglobin has a greater affinity for carbon dioxide than oxygen (iv) Alveoli increase surface area for exchange of gases (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (iii) (d) (ii) and (iv)

(d) (ii) and (iv) Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. Inhaled oxygen moves... View Article

Migratory birds fly to faraway areas during a particular time of a year. Which of the following conditions present in their habitat during that time are responsible for this behaviour? (i)Unavailability of food. (ii) Extreme weather conditions. (iii) Overcrowding. (iv) Lack of nesting areas. (a) ii & iii; (b) i & ii; (c) i & iv; (d) ii & iv.

d) i and ii The dwelling of a species in a particular area depends on the physical, biological and climatic conditions. The adverse conditions... View Article

The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas. When sulphur dioxide is dissolved in_________________, sulphurous acid is formed. The sulphurous acid turns _____________ litmus paper to ____________. Generally oxides of __________ are acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information.

The name of the product formed in the reaction of sulphur and Oxygen is sulphur dioxide gas. When sulphur dioxide is dissolved in water,... View Article

Choose the correct sequences (a) CO2 in atmosphere → decomposers → organic carbon in animals → organic carbon in plants (b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil (c) Inorganic carbonates in water → organic carbon in plants → organic carbon in animals → scavengers (d) Organic carbon in animals → decomposers → CO2 in atmosphere → organic carbon in plants

(b) CO2 in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil Nutrient cycles... View Article

Which of the following statements about transmission of nerve impulse is incorrect? (a) Nerve impulse travels from dendritic end towards axonal end (b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron (c) The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron (d) A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells

b) At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of... View Article

DCL Full Form

The Full Form Of DCL is a Data Control Language DCL commands are used to control the access data stored in a database. To execute any... View Article

SSL Full Form

The Full Form Of SSL is Secure Sockets Layer. The Secure Socket Layer is a protocol that provides security to confidential data following the... View Article