Science exemplar problems class 10 Solutions for Chapter 5 life processes

Two green plants A and B were kept separately in oxygen-free containers. Plant A was kept in a dark room and plant B was kept in continuous light. Which plant will live longer?

Choose the correct alternative with the correct reason.

During respiration, the exchange of gases take place in ………………………………

Oxygen liberated during photosynthesis comes from …………………

The blood leaving the tissues becomes richer in …………………………………..

The internal (cellular) energy reserve in autotrophs is ……………………..

Which of the following is an incorrect statement?

Identify!

During breathing, the air enters into the individual’s body through an organ having two openings called A. The air then passes through the common passageway for food and air and enters the windpipe called B. The windpipe further divides into smaller tubes called C. These C are attached to the two respiratory organs called D. Each smaller tubes further divides and forms the smallest branch that is called E. In the tip of the E, there are small structures called alveoli.

Which of the following options correctly identifies A, B, C, D and E?

Choose the event that does not occur in photosynthesis.

Choose the forms in which most plants absorb nitrogen

(i) Proteins

(ii) Nitrates and Nitrites

(iii) Urea

(iv) Atmospheric nitrogen

Assertion (A): Lack of oxygen in muscles leads to muscle cramps.

Reason (R): Accumulation of lactic acid from anaerobic respiration causes cramping in muscles.

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

Which of the following prevents backflow of blood inside the heart during contraction?

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains …………………………………

In which of the following parts of the alimentary canal food is finally digested?

Apart from the emulsification of fats, which of the following functions is/ are performed by bile?

What will be the effect on the rate of photosynthesis if the stomata of the plant are clogged?

State TRUE or FALSE:

Cuscuta is an example of parasitic plant.

In which of the following vertebrate group/groups, the heart does not pump oxygenated blood to different parts of the body?

Which of the following equations is the summary of photosynthesis?

Which of the following organisms depict a single circulatory system?

Which of the following statements is true about heart?

(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs.

(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs.

(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts.

(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body.

Which of the following is the correct word reaction for aerobic respiration?

Which is the correct sequence of air passage during inhalation?

The opening and closing of the stomatal pore depends upon

The filtration units of kidneys are called ………………………….

Which of the following statement(s) is (are) correct?

(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast

(ii) Fermentation takes place in aerobic bacteria

(iii) Fermentation takes place in mitochondria

(iv) Fermentation is a form of anaerobic respiration

Read the statements given below and choose the CORRECT option:

STATEMENT A: Leaves of plants should be coated with vaseline to keep them fresh for a longer duration of time.

STATEMENT B: Coating Vaseline to the leaves of healthy plants will clog the stomatal pores.

How do leaves of plants help in excretion?

Which of the following protects the inner lining of the stomach from the action of concentrated hydrochloric acid?

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

State whether the following statement is TRUE or FALSE:

All plants release oxygen during the day and carbon dioxide during the night.

Which of the following options gives the correct path of urine in the human body?

During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in ……………………..

State whether the following statement is TRUE or FALSE:

The opening and closing of stomata is regulated by the inflow and outflow of water from the guard cells.

Choose the correct statement that describes arteries.

State TRUE or FALSE:

A mode of nutrition in which food is ingested inside the organism is called holozoic nutrition .

Iodine reacts with starch to form a blue-black coloured compound. This test shows that the leaves consist of ……………………

Assertion (A): The breathing rate of fishes is lower compared to humans.

Reason (R) : The amount of dissolved oxygen in water is very less.

Read the reaction given below carefully:

Identify X.

State TRUE or FALSE:

Absence of platelets will not let to the formation of any blood clots.

Which of the following role does mouth play in digestion of food?

The gastric gland in the stomach secretes gastric juice. Which of the following are present in the gastric juice?

Which of the following nutrient is broken down by trypsin?

Which of the following is the substrate for amylase?

Assertion (A): Arteries have thick walls as compared to veins.

Reason (R): Blood flowing through arteries exerts high pressure on arterial walls.

Which of the following nutrient is the substrate for pepsin?

Which of the following nutrient is broken down by lipase?

State TRUE or FALSE:

Plants have low energy needs as compared to animals.

Assertion (A): Higher concentration of water in the xylem column creates an osmotic pressure in the root cells.

Reason (R): The osmotic pressure built up in the root cells pushes water and minerals (sap) upwards through the xylem.

Identify the given statement as TRUE or FALSE:

The walls of the small intestine secrete intestinal juice which carries out the final breakdown of maltose into glucose.

Observe the reactions given below carefully and choose the option which consists of the correct balanced reaction for photosynthesis.

If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?

Which of the following statements about autotrophic plants is incorrect?

Which of the following part of the alimentary canal receives bile from the liver?

Given below are a group of organisms which show different mode of nutrition. Which of the following groups exhibit a mode of nutrition where the food material is broken down outside the body and then absorbed?

Assertion (A): During the daytime, water enters the xylem through the transpirational pull.

Reason (R): The pressure generated due to the loss of water pulls the water in the xylem.

Which is the correct sequence of parts in human alimentary canal?

The organisms that can prepare their own food are called ………………………..

Read the table given below and choose the incorrect differentiating point between autotrophs and heterotrophs:

State TRUE or FALSE:

Obtaining nutrition is an essential life process required for the survival.

Observe the diagram of the cross-section of the leaf shown below:

Which of the following label indicates the waxy cuticle?

Observe the diagram of the cross-section of the leaf shown below :

Which of the following label indicate guard cell?

State TRUE or FALSE:

Organisms like leech have an autotrophic mode of nutrition.

The mode of nutrition, in which an organism derives their nutrition from other living organisms (referred to as host) is called ……………….. nutrition.

State TRUE or FALSE:

The lymph helps to transport oxygenated blood to different parts of the body.

The ………………………….. carries the digested and absorbed fat from the intestine and transports it throughout the body.

…………………………… is the process of continuous contraction and relaxation that causes movement of food inside the alimentary canal.

Due to which of the following reasons absorption of nutrients from the digested food takes place majorly in the small intestine?

Assertion (A): Rate of breathing in aquatic organisms much faster than in terrestrial organisms.

Reason (R) : Availability of oxygen is less in water than on land.

State TRUE or FALSE:

Lymph is made up of red as well as white blood cell.

Which of the following are the advantages of having a four-chambered heart?

The statements given below are the steps during photosynthesis.

A. Conversion of light energy into chemical energy.

B. Reduction of CO₂ to form carbohydrates.

C. Absorption of light energy by chlorophyll.

D. Splitting of water molecules into hydrogen and oxygen.

Which of the following options shows the correct order of steps in which photosynthesis occurs?

What will be the effect on the rate of photosynthesis if a plant is grown in well-manured soil?

Match the enzymes in Column (A) with their glands of secretion in Column (B).

State TRUE or FALSE:

Amoeba shows holozoic mode of nutrition.

Read the statements given below and choose the correct option:

STATEMENT A: Shedding dried leaves is the plant’s way of getting rid of the waste products.

STATEMENT B: Dried leaves do not consist of any waste products.