Important Questions (1 mark): Life Processes

10 Questions MCQ Test Science Class 10 | Important Questions (1 mark): Life Processes

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The vein which brings clean blood from the lungs into the heart is known as:


The form of veins that transfer oxygenated blood from the lungs to the heart is the pulmonary veins. The four major pulmonary veins, two from each of the lungs that flow into the left atrium of the heart, are the largest pulmonary veins. 


The opening and closing of the stomatal pore depend upon:

  • When a pair of guard cells surrounding a stoma receives the signal to open the stomatal pore, it is filled with water, thus changing the cell's shape and opening the pore.
  • When guard cells receive a signal to close the stoma, this initiates a loss of water and causes them to shrink and the pore closes.

Thus, option C is correct.


Movement of food through the oesophagus is due to :


Peristalsis is the rhythmic contraction and relaxation of muscles of the alimentary canal that propels the food in the downward direction.

How do astronauts digest food when there is no gravity in space? When they  eat food, why does it go down instead of up? - Quora


Oxygen liberated during photosynthesis comes from:


Photosynthetic oxygen evolution occurs via the light-dependent oxidation of water. Free oxygen is generated as a by-product of this reaction and is released into the atmosphere.


Sometimes we get painful cramps in our leg muscles after running for a long time due to the accumulation of:

  • During heavy exercise, the demand for energy is high but the supply of oxygen to produce energy is limited. Therefore, anaerobic respiration takes place in the muscle cells to fulfil the demand for energy.
  • This anaerobic breakdown of glucose leads to the formation of lactic acid in muscles.
  • The accumulation of lactic acid in muscles leads to muscle cramps.

Thus option A is correct.


The filtration units of kidneys are called


Nephrons are the basic filtering units of a kidney each kidney poses a large number of nephrons approximately 1-1.5 million.

The main functions of a nephron are:
(i) Filtration
(ii) Ultrafiltration
(iii) Absorption
(iv) Reabsorption


The common step between aerobic and anaerobic respiration takes place in :


Aerobic respiration first occurs in the cytoplasm and then in mitochondria, whereas Anaerobic respiration occurs in the cytoplasm itself.


When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of


The air we exhale contains CO2. When carbon dioxide is passed through lime water or Ca(OH)then it form calcium carbonate which is white in colour.


Which is the first enzyme to mix with food in the digestive tract ?


Salivary amylase, present in saliva, is the first digestive enzyme that gets mixed with food in the oral cavity during the process of mastication and bolus formation. The digestive enzyme salivary amylase hydrolyzes starch into maltose, malto-triose, dextrin and a small amount of glucose.


Which part of alimentary canal receives bile from the liver ?


The small intestine is made up of duodenum, jejunum, and ileum. It receives the bile from the liver which helps in the breakdown of fats.

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