Life Processes - Interactive Board Practice | Learning with Dr. Pradeep Sir

Source: 23 (4).pdf (Q.P. Code 31/1/1) | [1 Mark]

Q1. An organism which breaks down the food material outside the body and then absorbs it is:

(a) a plant parasite, Cuscuta (b) an animal parasite, Tapeworm (c) a bacteria, Rhizobium (d) a fungi, Rhizopus

Source: 23 (4).pdf (Q.P. Code 31/1/1) | [1 Mark]

Q2. Consider the following statements about the small intestine and select the one which is NOT correct:

(a) The length of the small intestine in animals differs as it depends on the type of food they eat. (b) The small intestine is the site of complete digestion of food. (c) The small intestine receives secretions from liver and pancreas. (d) The villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.

Source: 23 (5).pdf (Q.P. Code 31/2/1) | [1 Mark]

Q3. Sphincter muscles are present at the exit of:

(a) Stomach and small intestine (b) Stomach and anus (c) Small intestine and large intestine (d) Oesophagus and stomach

Source: 23 (1).pdf (Q.P. Code 31/4/1) | [1 Mark]

Q4. Opening and closing of stomata is due to:

(a) High pressure of gases inside the cells. (b) Movement of water in and out of the guard cells. (c) Stimulus of light in the guard cells. (d) Diffusion of CO2 in and out of the guard cells.

Source: 25 (5).pdf / 26 (1).pdf (Q.P. Code 31/5/1) | [1 Mark]

Q5. Identify the part that controls the closing and opening of the stomatal pore in leaves of plants.

(A) Stomata (B) Epidermal cells (C) Guard cells (D) Chloroplasts

Source: 25 (2).pdf / 26 (3).pdf (Q.P. Code 31/2/1) | [1 Mark]

Q6. The carbohydrates, which are not used immediately in plants, are stored in the form of 'a', which serves as an internal energy reserve. What does 'a' stand for?

(A) Starch (B) Sugar (C) Fat (D) Protein

Source: 25 (2).pdf / 26 (3).pdf (Q.P. Code 31/2/1) | [1 Mark]

Q7. The following events occur during the process of photosynthesis: (i) Oxidation of CO2 to carbohydrates, (ii) Conversion of light energy into chemical energy, (iii) Absorption of light energy by chlorophyll, (iv) Conversion of hydrogen and oxygen into water. Choose the correct sequence/events option:

(A) (i) and (ii) (B) (ii) and (iii) (C) (iii) and (iv) (D) (i) and (iv)

Source: 25 (4).pdf / 26 (5).pdf (Q.P. Code 31/4/1) | [1 Mark]

Q8. Observe bread mold fungi growing over a substrate and select the statement that correctly states how these fungi obtain nutrition.

(A) By eating the bread on which it is growing. (B) By using nutrients from the bread to prepare their own food. (C) By breaking down the nutrients of bread outside the body and then absorbing them. (D) By allowing other organisms to grow on the bread and then consuming them.

Source: 25 (5).pdf / 26 (1).pdf (Q.P. Code 31/5/1) | [1 Mark | Assertion-Reason]

Q9. Assertion (A): The peristaltic movements occur all along the gut.
Reason (R): The lining of the gut has muscles that contract rhythmically to push the food in a regulated manner.

(A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false. (D) (A) is false, but (R) is true.

Source: 23 (1).pdf (Q.P. Code 31/4/1) | [1 Mark | Assertion-Reason]

Q10. Assertion (A): The inner walls of the small intestine have finger-like projections called villi which are rich in blood.
Reason (R): These villi have a large surface area to help the small intestine in completing the digestion of food.

(A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false. (D) (A) is false, but (R) is true.

Source: 23 (5).pdf (Q.P. Code 31/2/1) | [1 Mark]

Q11. During vigorous exercise, the occurrence of cramps in the outer muscles of an athlete is due to the conversion of pyruvate to:

(a) Glucose (b) Ethanol (c) Lactic acid (d) Lactose

Source: 23 (5).pdf (Q.P. Code 31/2/1) | [1 Mark]

Q12. In the human respiratory system, when a person breathes in, the position of the ribs and diaphragm will be:

(a) lifted ribs and curve/dome-shaped diaphragm. (b) lifted ribs and flattened diaphragm. (c) relaxed ribs and flattened diaphragm. (d) relaxed ribs and curve/dome-shaped diaphragm.

Source: 23c.pdf (Q.P. Code 31/C/1) | [1 Mark]

Q13. What is the molecule produced initially in the cytoplasm during glucose breakdown in both aerobic and anaerobic respiration?

(a) Lactic acid (b) Ethanol (c) Carbon dioxide (d) Pyruvate

Source: 23c.pdf (Q.P. Code 31/C/1) | [1 Mark]

Q14. The reason why a plant releases more carbon dioxide at night compared to the daytime is because:

(a) It is not produced during the day. (b) It gets accumulated in the leaves during the day. (c) Most of the carbon dioxide produced during the day is used up in photosynthesis. (d) Plants do not respire during the day.

Source: 23 (2).pdf (Q.P. Code 31/5/1) | [1 Mark]

Q15. As compared to terrestrial organisms, the rate of breathing in aquatic organisms is:

(a) faster because they need more oxygen for their survival. (b) faster because the amount of dissolved oxygen in water is fairly low. (c) slower because the amount of dissolved oxygen in water is fairly low. (d) slower because the capacity of water of dissolving atmospheric air is limited.

Source: 25 (5).pdf / 26 (1).pdf (Q.P. Code 31/5/1) | [1 Mark]

Q16. Choose the equation of reaction that correctly represents anaerobic respiration in muscles:

(A) Glucose → Pyruvate --[Absence of O2]--> Ethanol + CO2 + Energy (B) Glucose --[O2]--> Pyruvate --[O2]--> Energy (C) Glucose --[O2]--> Pyruvate --[Lack of O2]--> Ethanol + Energy (D) Glucose → Pyruvate --[Lack of O2]--> Lactic acid + Energy

Source: 25 (3).pdf / 26 (4).pdf (Q.P. Code 31/3/1) | [1 Mark]

Q17. Pravin was evaluated on anaerobic respiration characteristics: (i) Location: Muscle cell, (ii) Condition: Requires presence of O2 and CO2, (iii) End Product: 3-Carbon molecule. Which are correct?

(A) (i) and (ii) (B) (i) and (iii) (C) (ii) and (iii) (D) (i) only

Source: 23 (1).pdf (Q.P. Code 31/4/1) | [1 Mark]

Q18. Consider root water absorption ascending to exit a leaf as vapor. Identify the process and its significance:

(a) Evaporation: maintains water contents in leaf cells. (b) Transpiration: creates a suction force which pulls water inside the plant. (c) Excretion: helps in excreting out waste water from the plant. (d) Translocation: helps in transporting materials from one cell to another.

Source: 23 (2).pdf (Q.P. Code 31/5/1) | [1 Mark]

Q19. The process in which loss of water in the form of vapours from the aerial parts of plants takes place is X, which helps in Y. Here X and Y respectively are:

(a) transpiration and photosynthesis. (b) transpiration and temperature regulation. (c) translocation and movement of soluble products of photosynthesis in phloem. (d) translocation and absorption of water and minerals from soil by roots.

Source: 23 (2).pdf (Q.P. Code 31/5/1) | [1 Mark]

Q20. The process in which transport of soluble products of photosynthesis takes place in plants is known as:

(A) Transpiration (B) Evaporation (C) Conduction (D) Translocation

Source: 25c.pdf (Q.P. Code 31/S/1) | [1 Mark]

Q21. The valves in the human heart ensure that: (i) Oxygen-rich blood flows from LA to LV only, (ii) Deoxygenated blood flows from LA to LV only, (iii) Oxygen-rich blood flows from RA to RV only, (iv) Deoxygenated blood flows from RA to RV only.

(A) (i) and (iii) (B) (ii) and (iv) (C) (i) and (iv) (D) (ii) and (iii)

Source: 25 (4).pdf / 26 (5).pdf (Q.P. Code 31/4/1) | [1 Mark]

Q22. In human beings, the oxygen-rich blood is pumped out to the body by:

(A) contraction of right atrium (B) relaxation of left ventricle (C) contraction of right ventricle (D) contraction of left ventricle

Source: 23 (4).pdf (Q.P. Code 31/1/1) | [1 Mark | Assertion-Reason]

Q23. Assertion (A): Blood clotting prevents excessive loss of blood.
Reason (R): Blood clotting is due to blood plasma and white blood cells present in the blood.

(A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false. (D) (A) is false, but (R) is true.

Source: 25 (2).pdf / 26 (3).pdf (Q.P. Code 31/2/1) | [1 Mark | Assertion-Reason]

Q24. Assertion (A): Blood plasma transports carbon dioxide in dissolved form, while oxygen is transported by respiratory pigments.
Reason (R): Carbon dioxide is more soluble in water than oxygen is.

(A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false. (D) (A) is false, but (R) is true.

Source: 25c.pdf (Q.P. Code 31/S/1) | [1 Mark | Assertion-Reason]

Q25. Assertion (A): Transpirational pull helps in the absorption and upward movement of water and dissolved minerals in plants.
Reason (R): The effect of root pressure in transport of water is more significant at night.

(A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false. (D) (A) is false, but (R) is true.

Source: 25 (3).pdf / 26 (4).pdf (Q.P. Code 31/3/1) | [1 Mark | Assertion-Reason]

Q26. Assertion (A): The basic filtration unit in the kidneys, like in the lungs, is a cluster of very thin-walled blood capillaries.
Reason (R): Each capillary cluster in the kidney is associated with the cup-shaped end of a coiled tube called Bowman’s capsule.

(A) Both (A) and (R) are true and (R) is the correct explanation of (A). (B) Both (A) and (R) are true, but (R) is not the correct explanation of (A). (C) (A) is true, but (R) is false. (D) (A) is false, but (R) is true.