Class 10 Science Chapter 5 MCQ

The various organs in sequence of mouth, oesophagus, stomach, small intestine and large intestine and anus. The nutrition in human beings take place through the digestive system, that consists of alimentary canal and associated glands.

The first step is the break-down of glucose, a six-carbon molecule, into a three-carbon molecule called pyruvate. This process takes place in the cytoplasm.

The blood leaving the tissues becomes richer in Carbon Dioxide. Because tissues receive the oxygenated blood from arteries and used up the oxygen to take energy and release the carbon dioxide.

The correct path of urine is Kidney → Ureters → Urinary bladder → Urethra. The urine formed in each kidney eventually enters a long tube, the ureter, which connects the kidneys with the urinary bladder. Urine is stored in the urinary bladder until the pressure of the expanded bladder leads to the urge, to pass it out through the Urethra.

Non-living things which are not alive cannot move by themselves. For example, a stone is a non-living thing which cannot move by itself from one place to another or show any other type of movement. We will have to move it by applying force from outside.

Using the material in the form of carbon dioxide and water which is converted into carbohydrates in the presence of sunlight and chlorophyll. Carbohydrates are utilised for providing energy to the plant. The carbohydrates which are not used immediately are stored in the form of starch, which serves as the internal energy reserve to be used as and when required by the plant.

Cells generally does not share the transaction of the particles or molecules.

Nitrogen is an essential element used in the synthesis of proteins and other compounds. This is taken up in the form of inorganic nitrates or nitrites. Sometimes it is taken up as organic compounds i.e., urea, which have been prepared by bacteria from atmospheric nitrogen.

Here, all the statements are correct. Hence your answer will be option [D].

The summary equation of photosynthesis is: 6CO2 + 12H20+ Chlorophyll +Sunlight → C6H12O6 +6CO2 + 6H2O by using. Photosynthesis is a process by which green plants make their own food, e.g., glucose, CO2 and H2O in the presence of sunlight energy and chlorophyll in the presence of. Oxygen gas is released during the process of photosynthesis.

Nostrils → pharynx → larynx → trachea → alveoli. The alveoli provide a surface where the exchange of gases can take place.

Alveoli of lungs. The walls of the alveoli contain an extensive network of blood-vessels. When we breathe in, we lift our ribs and flatten our diaphragm, and the chest cavity becomes larger as a result. Because of this, air is sucked into the lungs and fills the expanded alveoli. The blood brings carbon dioxide from the rest of the body for release into the alveoli, and the oxygen in the alveolar air is taken up by blood in the alveolar blood vessels to be transported to all the cells in the body.

Here, all the statements are correct. Hence your answer will be option [D].

Oxygen liberated during photosynthesis comes from water. The following events occur during photosynthesis (i) Absorption of light energy by chlorophyll. (ii) Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen. (iii) Reduction of carbon dioxide to carbohydrates, which is used as food for plants

The mucus is secreted in the gastric juice by the glands present in the stomach wall. It helps to protect the wall of stomach from its own secretions of hydrochloric acid. If mucus is not secreted, HCI will cause the erosion of inner lining of stomach leading to ulcer formation. Pepsin acts on proteins in the stomach. Salivary amylase is present in saliva, it acts on starch in the mouth. Bile helps in emulsification of fat in small intestine.

Pisces have only two chambers to their hearts, and the blood is pumped to the gills, is oxygenated there, and passes directly to the rest of the body. Thus, blood goes only once through the heart in the fish during one cycle of passage through the body.

The following events occur in photosynthesis (i) Absorption of light energy by chlorophyll. (ii) Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen. (iii) Reduction of carbon dioxide to carbohydrates.

In Pisces (fishes), the heart is 2 chambered oral pumps deoxygenated blood to the gills, where oxygenation takes place by diffusion. The oxygenated blood from the gills is supplied to the body parts where oxygen is utilised and CO2 enters it making the blood deoxygenated. This deoxygenated blood returns to the heart. Thus, it has single circulation, i.e., blood passes through the heart only once during one complete cycle.

Here, all the statements are correct. Hence your answer will be option [D].

The whole process of an aerobic respiration take place in the cytoplasm of cells.

Fermentation is a form of anaerobic respiration in which Pyruvate can be converted into ethanol and carbon dioxide by yeast.

The air for respiration is drawn into our body through the nostrils, it then goes into nasal passage. From there, air enters into pharynx, larynx, then into the windpipe (or trachea), bronchi, lungs and finally to the alveoli where gaseous exchange takes place.

Here, all the statements are correct. Hence your answer will be option [D].

Pancreas secretes pancreatic juice which contain following: Digestive enzymes amylases, lipases, trypsin. Amylase breaks down the starch, trypsin digests the proteins and lipase breaks down the emulsified fats.

The blue black colour of rice water confirms the presence of starch. No colour change will be seen in case of proteins fats in iodine solution colour, when iodine is added with them. Note: A starch solution on addition of iodine turns blue black in colour.