Free Life Processes 01 Practice Test - 10th Grade
Question 1
In this experiment, how does KOH affect the process of photosynthesis in the plant kept in a bell jar?
Increases water intake and O2 production
Inhibits CO2 intake by the plant
Stops the food production in leaves
Stops photolysis of water
SOLUTION
Solution : B and C
KOH or potassium hydroxide is an absorbent of carbon dioxide. In the closed jar, the entire carbon dioxide is absorbed by KOH. Hence this does not allow production of food, as glucose is produced by the reduction of carbon dioxide during the process of photosynthesis.
Question 2
How is food transported to food vacuole of paramecium?
By movement of cilia
By pseudopodia
Food vacuole directly captures the food
By contractile vacuole
SOLUTION
Solution : A
Paramecium uses cilia to sweep food particles along with some water into an oral groove (a groove present on the surface of paramecium). At the end of the oral groove, a food vacuole gets created. This food vacuole further travels throughout the cytoplasm and during this journey, the food inside the vacuole gets digested and absorbed.
Question 3
Assertion: Length of the small intestine in cows is longer than in tigers.
Reason: Cellulose digestion takes lesser time than digestion of flesh.
Both A and R are correct
A is correct and R is incorrect
Both A and R are incorrect
A is incorrect and R is correct
SOLUTION
Solution : B
Digestion of cellulose takes more time because the enzymes required for cellulose digestion are produced by the ruminant bacteria. These bacteria live in the gut of the herbivores and take time to completely breakdown the cellulose. Since, cellulose digestion takes time so the herbivores have a longer small intestine which ensures that the food stays in the intestine for a longer period of time for complete digestion.
Question 4
What is the function of the sac-like structures present at the end of bronchioles?
Storage of respiratory gases
Exchange of respiratory gases
Protection of lungs
Protection from bacteria
SOLUTION
Solution : B
Alveoli or air sacs are formed at the end of bronchioles. They provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood vessels. The blood brings carbon dioxide from the rest of the body and releases it into the alveoli. The oxygen in the alveolar air is taken up by the blood in the alveolar blood vessels and is transported to all cells in the body.
Question 5
Which among the following substances are reabsorbed in the nephron?
Urea, Uric acid, Amino acid
Glucose, Amino acids, Salts
Glucose, Urea, Creatinine
KCl, Urea, Glucose
SOLUTION
Solution : B
Glucose, amino acids, salts and high amount of water are reabsorbed in the nephron during the second step of urine formation, i.e., the selective reabsorption. These essential substances were filtered out from the blood in the first step called glomerular filtration and are reabsorbed as they are vital for the functioning of our body.
Question 6
What is the role of platelets in our blood?
SOLUTION
Solution : C
Platelets are tiny blood cells that help stop bleeding by forming clots. At the time of injury, when any blood vessels get damaged, it sends out signals. These signals are received by platelets and they, along with fibrinogen, a protein present in plasma form a clot and heal the wound.
Question 7
Dialysis fluid contains all the constituents of the plasma except _______ .
SOLUTION
Solution : A
Dialysis fluid contains all the constituents of the plasma except the nitrogenous wastes. Urea is the main nitrogenous waste of the body. In case of kidney failure, urea gets accumulated in the blood.
Question 8
Exchange of gases in alveoli occurs through _________ .
SOLUTION
Solution : C
Diffusion is the movement of a substance from an area of higher concentration to an area of lower concentration. The air in alveoli contains higher concentration of oxygen. The alveoli are very close to capillaries, which has low oxygen concentration and high carbon dioxide as compared to alveolar air. Oxygen diffuses from the alveoli, into the blood in the capillaries. Similarly, carbon dioxide from the blood moves out of the capillaries into the alveoli.
Question 9
Which tissue in plants help in organic translocation?
SOLUTION
Solution : C
Translocation is the transport of soluble products of photosynthesis. It occurs in the part of the vascular tissue known as phloem. The phloem also transports amino acids and other substances. These substances are especially delivered to the storage regions of roots, fruits and seeds and to growing regions.
Question 10
Which one of the following is surrounded by a rich amount of capillaries?
SOLUTION
Solution : B
∙ The alveoli are surrounded by tiny blood vessels, called capillaries. It is the alveoli that receive the oxygen and pass it on to the blood.
∙ Alveoli and capillaries both have very thin walls, which allow the oxygen to pass.
∙ Trachea, also called the windpipe, is a cartilaginous tube that connects the pharynx and larynx to the lungs.
∙ Nostril is either of the two external openings of the nasal cavity that allows air to enter the lungs.
∙ Bronchi are the air passages into the lungs.