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Name the following (a) The process in plants that links light energy with chemical energy (b) Organisms that can prepare their own food (c) The cell organelle where photosynthesis occurs (d) Cells that surround a stomatal pore (e) Organisms that cannot prepare their own food (f) An enzyme secreted from gastric glands in the stomach that acts on proteins.

(i) Photosynthesis: It is a process by which green plants having chlorophyll synthesise simple sugar (glucose) from water and $CO_{2}$ using the... View Article

Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions (a) Low temperature, low pressure (b) High temperature, low pressure (c) Low temperature, high pressure (d) High temperature, high pressure

(c) Low temperature and high pressure are required to liquefy gases to liquids. There is a lot of space between the particles of a gas. On... View Article

Classify the following into osmosis/diffusion (a) Swelling up of a raisin on keeping in water. (b) Spreading of virus on sneezing. (c) Earthworm dying on coming in contact with common salt. (d) Shrinking of grapes kept in thick sugar syrup. (e) Preserving pickles in salt. (f) Spreading of smell of cake being baked throughout the house. (g) Aquatic animals using oxygen dissolved in water during respiration

(a) The swelling up of a raisin on keeping in water is Osmosis The concentration of solutes in raisin is more than outside water. Hence, water... View Article

In the following statements, the underlined words are jumbled up. Write them in their correct form. (a) Air contains 78% ginroten and 21% gonexy. (b) Vehicles produce high level of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi and mosek. (c) Carbon dioxide, thaneme, nitrous oxide and water vapour are known as heengrouse sesga. (d) Gangotri glacier in Himalaya has started melting because of lablog ringwam. (e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.

(a) Air contains 78% nitrogen and 21% oxygen. (b) Vehicles produce high level of pollutants like carbon dioxide, nitrogen oxides, carbon monoxide... View Article

Which is the correct sequence of the components of a reflex arc? (a) Receptors→ Muscles→ Sensory neuron→ Motor neuron→ Spinal cord (b) Receptors→ Motor neuron → Spinal cord → Sensory neuron → Muscle (c) Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle (d) Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle

d) Receptors → sensory neuron → spinal cord → motor neuron → muscle When a receptor is stimulated, it sends a signal to the... View Article

In brief state what happens when (a) dry apricots are left for sometime in pure water and later transferred to sugar solution? (b) a Red Blood Cell is kept in concentrated saline solution? (c) the Plasma membrane of a cell breaks down? (d) rheo leaves are boiled in water first and then a drop of sugar syrup is put on it? (e) golgi apparatus is removed from the cell?

a) Dry apricots when left in pure water, will gain water due to endosmosis and swell. When placed in a concentrated sugar solution, they lose... View Article