Mix Examples - Life Processes Questions in English

(N/A) To decide whether something is alive,we generally look for visible movements such as walking,breathing,or growth.
However,living organisms also exhibit molecular movements that are not visible to the naked eye.
Therefore,the presence of life processes,such as nutrition,respiration,transport,and excretion,is the fundamental criterion used to determine if an organism is alive.

(C) The processes that are essential for maintaining life are collectively known as life processes. These include:
$1$. Nutrition: The process of obtaining energy from food.
$2$. Respiration: The process of breaking down food to release energy.
$3$. Transportation: The movement of substances within the organism.
$4$. Excretion: The removal of metabolic waste products from the body.

(N/A)

Alveoli	Nephron
Structure	Structure
$(i)$ Alveoli are tiny balloon-like structures present inside the lungs.	$(i)$ Nephrons are tubular structures present inside the kidneys.
$(ii)$ The walls of the alveoli are one cell thick and contain an extensive network of blood capillaries.	$(ii)$ Nephrons consist of a glomerulus,Bowman's capsule,and a long renal tubule. They also contain a cluster of thin-walled capillaries.
Function	Function
$(i)$ The exchange of $O_2$ and $CO_2$ takes place between the blood of the capillaries surrounding the alveoli and the gases present in the alveoli.	$(i)$ Blood enters the kidneys through the renal artery,which branches into many capillaries in the glomerulus. Water and solutes are transferred to the nephron at Bowman's capsule. The filtrate then moves through the proximal tubule,the loop of Henle,the distal tubule,and finally into the collecting duct. During this process,substances like glucose,amino acids,and water are selectively reabsorbed.
$(ii)$ Alveoli are the primary site of gaseous exchange.	$(ii)$ Nephrons are the basic filtration units of the kidney.

(A) Life processes are the basic functions performed by living organisms to survive.
$1$. Organisms must repair and maintain their structure to prevent damage and breakdown,which requires energy.
$2$. Organisms grow with time as they synthesize new materials.
$3$. Energy is essential for all life processes,including metabolic activities.
$4$. The movement of molecules is a fundamental characteristic of life; molecules are constantly moving within and between cells to facilitate transport,signaling,and metabolic reactions.
Therefore,the statement that the movement of molecules does not take place among cells is incorrect.

(B) The plant kept in continuous light will live longer.
This is because,in the presence of light,the plant performs photosynthesis,which produces $O_2$ as a byproduct.
This $O_2$ is then utilized by the plant for its cellular respiration,allowing it to survive.
In contrast,the plant kept in the dark cannot perform photosynthesis and will quickly consume the limited oxygen available in the container,leading to its death.

(A) The correct matches are as follows:
$(a)$ Phloem is responsible for the $(ii)$ Translocation of food in plants.
$(b)$ Nephron is the structural and functional unit of the kidney involved in $(i)$ Excretion.
$(c)$ Veins are blood vessels that carry $(iv)$ Deoxygenated blood towards the heart.
$(d)$ Platelets are blood cells that help in the $(iii)$ Clotting of blood.
Therefore,the correct sequence is $(a-ii, b-i, c-iv, d-iii)$.

(A) The sense of taste and the sense of smell are closely linked.
When a person suffers from a severe cold,the nasal passages become congested with mucus,which blocks the olfactory receptors responsible for detecting odors.
Since a significant portion of what we perceive as 'taste' is actually the aroma of food,the inability to smell prevents the brain from fully distinguishing between different flavors,such as an apple and an ice cream.
Therefore,the correct answer is $A$.

(N/A) Rings of cartilage are present in the trachea to prevent it from collapsing when there is no air inside it,ensuring that the airway remains open for breathing.
$(b)$ $(i)$ Mucus protects the inner lining of the stomach from the corrosive action of $HCl$ under normal conditions.
$(ii)$ Mucus lubricates the food,making it smoother so that it can move easily through the alimentary canal.

(N/A) In multicellular organisms,cells are not in direct contact with the external environment. Specialized tissues are responsible for the uptake of food and oxygen at specific sites. Since these substances are required by all cells throughout the body,a transportation system is essential to move them from the site of absorption to all other parts.
$(b)$ Metabolic activities within an organism produce various waste products,many of which are toxic or harmful if allowed to accumulate. An excretory system is required to filter and remove these harmful by-products from the body to maintain homeostasis.

(N/A) The product formed is lactic acid.
The accumulation of lactic acid in the muscles leads to muscle cramps.
$(b)$ In yeast,fermentation results in the production of ethanol and carbon dioxide. In contrast,aerobic respiration results in the production of carbon dioxide and water. Additionally,the amount of energy $(ATP)$ released during fermentation is significantly lower than that released during aerobic respiration.

(N/A) If peristaltic movements do not occur,the food will not be pushed forward into the stomach,leading to an inability to swallow or digest food properly.
$(b)$ If there are no platelets in the blood,the blood will not clot in the event of an injury,which could lead to excessive and potentially fatal blood loss.
$(c)$ In the absence of rings of cartilage,the trachea (windpipe) would collapse during inhalation because the air pressure inside the tube decreases,potentially obstructing the airway.

(A) $(a) (i)$ Herbivores,which consume grass,possess a longer small intestine to facilitate the digestion of cellulose. Cellulose is a complex carbohydrate that requires more time to break down,necessitating a longer transit time within the digestive tract.
$(a) (ii)$ Carnivores,which consume meat,have a shorter small intestine because meat is protein-rich and relatively easy to digest,requiring less time for nutrient absorption.
$(b) (i)$ Within the lungs,the trachea branches into smaller tubes called bronchi and bronchioles,which terminate in numerous balloon-like structures known as alveoli. These alveoli are surrounded by an extensive network of blood capillaries,providing a massive surface area for the efficient diffusion of gases.
$(b) (ii)$ The concentration of dissolved oxygen in water is significantly lower than the concentration of oxygen in the atmosphere. Consequently,aquatic organisms,such as fish,must pump water through their gills at a much higher rate to extract sufficient oxygen for their metabolic needs.

(N/A) The sectional view of the human heart shows the four chambers and major blood vessels. The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs. The right atrium receives deoxygenated blood from the body. The left ventricle pumps oxygenated blood to the rest of the body. The septum separates the right and left sides of the heart to prevent the mixing of oxygenated and deoxygenated blood.
$(b)$ $(i)$ Xylem: Transports water and dissolved minerals from the roots to the leaves.
$(ii)$ Phloem: Transports food (sucrose) synthesized in the leaves to other parts of the plant (translocation).
$(iii)$ Pulmonary vein: Transports oxygenated blood from the lungs to the left atrium of the heart.
$(iv)$ Vena cava: Transports deoxygenated blood from the body tissues to the right atrium of the heart.

(C) Life processes are the basic functions performed by living organisms to survive and maintain their body structure.
$1$. Organisms grow with time as they assimilate nutrients and build new cellular components.
$2$. Maintenance and repair of body structures are continuous processes to replace worn-out tissues.
$3$. Movement of molecules is essential for life; substances like oxygen,carbon dioxide,nutrients,and waste products constantly move between cells and the environment to sustain metabolism.
$4$. Energy is required for all life processes,including growth,repair,and transport.
Therefore,the statement that 'Movement of molecules does not take place among cells' is incorrect.

(A) The statement is $True$. The liver is the largest internal organ and the largest gland in the human body. It performs various essential functions,including detoxification,protein synthesis,and the production of biochemicals necessary for digestion.