BIO TEST- LIFE PROCESSES

Time allowed: 3 Hours Maximum Marks: 80

General Instructions:

1. The question paper consists of 39 questions in 5 sections.

2. All questions are compulsory. However, an internal choice is provided in some questions. A student
is expected to attempt only one of these questions.
3. Section A consists of 20 objective type questions carrying 1 mark each.
4. Section B consists of 6 Very Short Answer type questions carrying 02 marks each. Answer to these
questions should in range of 30 to 50 words.
5. Section C consists of 7 Short Answer type questions carrying 03 marks each. Answer to these
questions should in the range of 50 to 80 words.
6. Section D consists of 3 Long answer type questions carrying 05 marks each. Answer to these
questions should be in the range of 80 to 120 words.
7. Section E consists of 3 source based/ case-based unit of assessment of 4 marks each with sub parts.

SECTION – A 20 marks

(Select and write one most appropriate option out of the four options given for each of the
questions 1-20)
1. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in :
(a) Cytoplasm (b) Mitochondria (c) Chloroplast (d) Nucleus
2. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted to lactic acid in
the
(a) Cytoplasm (b) Chloroplast (c) Mitochondria (d) Golgi apparatus
3. The opening and closing of the stomatal pore depend upon
(a) Oxygen (b) temperature (c) water in guard cell (d) conc of CO2 in stomata
4. The internal cellular energy reserved in autotrophs is
(a) Glycogen (b) protein (c) starch (d) fatty acid
5. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will
be affected
(a) Proteins breaking down into amino acid
(b) Starch breaking down into sugars
(c) Fats breaking down into fatty acid and glycerol
(d) Absorption of vitamins
6. During respiration exchange of gases takes place in
(a) Trachea and larynx
(b) Alveoli of lungs
(c) Alveoli and throat
(d) Throat and larynx
7. What prevents backflow of blood inside the heart during contraction?
(a) Valves in heart (b) Thick muscular valves of ventricles (c) Thin walls of atria (d) all of these
8. Given below is the picture of tiny pores present on the green parts of the plants that help in
gaseous exchange. Identify A, B, C, and D in the given diagram
(a) Subsidiary cell, epidermal cell, stomatal pore, guard cell
(b) Epidermal cell, subsidiary cell, stomatal pore, guard cell
(c) Guard cell, subsidiary cell, stomatal pore, epidermal cell
(d) Epidermal cell, guard cell, stomatal pore, subsidiary cell
9. Raju used to believe that when we eat food, it goes to stomach and there the digestion starts.
But the teacher told him that digestion of food starts in the mouth. Which of the following
enzyme-substrate combination is present in the mouth
(a) Salivary amylase- proteins
(b) Lipase- carbohydrate
(c) Salivary amylase- carbohydrate
(d) Salivary amylase- lipids
10. Riya marked a structure as ‘P’ in the figure of stomata as shown in the following figure.
Which of the following processes cannot occur if the structure of P is
blocked?
(a) Transpiration and photosynthesis
(b) Transpiration and respiration P
(c) Transpiration, respiration and photosynthesis
(d) Transportation and photosynthesis
11. The lactic acid concentration in blood of a student during a sport’s day race, with point D
showing the peak is depicted in the graph.
While competing in the race during sport’s
day, the student started producing lactic
acid. Which of the subsequent process best
describe this incident?
(a) Breathing
(b) Aerobic respiration
(c) Anaerobic respiration
(d) Fermentation
12. Assertion(A): Tigers have a shorter small intestine whereas deer have longer small intestine.
Reason(R): The length of the small intestine depends on the type of food the animals eat.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true and R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
13. It is necessary to separate oxygenated and deoxygenated blood in mammals and birds because
(a) To prevent efficient supply of oxygen
(b) Due to their low energy needs
(c) To provide efficient supply of oxygen
(d) To provide efficient supply of carbon dioxide
14. The xylem in plants is responsible for
(a) Transport of water (b) transport of amino acid (c) transport of food (d) transport of
oxygen.
15. Stomatal pores open when
(a) Water from the surrounding cells enter into guard cell
(b) Water from guard cell goes to the surrounding cell
(c) The plants are in dark
(d) No movement of water occur between the guard cells and surrounding cells.
16. Photosynthesis occurs inside the
(a) Mitochondria (b) ribosomes (c) chloroplasts (d) vacuole
17. The four important factors of photosynthesis are
(a) Light, carbon dioxide, chlorophyll and temperature
(b) Light, chlorophyll, water, and temperature
 (c) Water, chlorophyll, temperature and carbon dioxide.
18. The most common gas liberated during aerobic respiration, anaerobic respiration and
fermentation is
(a) Carbon monoxide (b) carbon dioxide (c) oxygen (d) all of these.
19. Which of the following is the site of complete digestion of carbohydrate, proteins and fats
(a) Stomach (b) large intestine (c) small intestine (d) pancreas
20. Bile juice secreted by
(a) Liver (b) stomach (c) salivary gland (d) small intestine

SECTION – B 12 marks

(Q. no. 21 to 26 are very short answer questions)

21. Patients whose gall bladder is removed are recommended to eat less oily food. Why?

22. Name the substances other than water that are absorbed during urine formation. What are the two
parameters that decide the amount of water that is reabsorbed in the kidney?

OR
What are the differences between the transport of materials in xylem and phloem?

23. What processes would you consider essential for maintaining life?

24. How is the small intestine designed to absorb digested food?

OR

What is the function of digestive enzymes?

25. How does transpiration help in upward movement of water from roots to leaves?

26. What is the function of blood capillaries surrounding the nephrons?

SECTION – C 21 marks

(Q. no. 27 to 33 are short answer questions)

27. A. State the role played by the following in the process of digestion. (1) Enzyme trypsin (2) Enzyme
lipase. B. List two functions of finger like projections present in the small intestine.

28. The leaves of a plant were covered with aluminum foil; how would it affect the physiology of the
plant?

OR

How is lymph an important fluid involved in transportation? If lymphatic vessels get blocked, how
would it affect the human body?

29. What are the functions of kidneys? Name the filtration unit present in kidney. Name two
substances which are selectively reabsorbed from nephric filtrate into the blood.

30. What are the components of the transport system in human beings? What are the functions of
these components.

31. Using only flow chart, write the path of O2 from trachea to respiring tissue cell.

32. Respiration is a vital function of the body. Justify.

 33. Define photosynthesis. Write a chemical equation to show the process of photosynthesis in plants.
Name the various factors which affect this process.

SECTION – D 15 marks

(Q. no. 34 to 36 are long answer questions)

34. (a) Define excretion. (b) Name the basic filtration unit present in the kidneys. (c) Draw excretory
system in human beings and label the following organs of excretory system which perform following
functions: 1. Form urine 2. Is a long tube which collects urine from kidney 3. Store urine until it is passed out.

35. With the help of neat labelled diagram describe the structure and functions of human heart.

36. Explain the human digestive system with the help of diagram.

OR

With the help of labelled diagram describe the transport of water and minerals in plants.

SECTION – E 12 marks

(Q.no. 37 to 39 are case based/ data-based questions with 2 to 3 short sub parts.)

37. When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The
glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B
contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the
mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into the
stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G, and
H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G
protects the inside layer of stomach form the damaging effect of substance F whereas substance H is an
enzyme for digestion. The partially digested food then enters into small intestine for further digestion.

(a) What is (i) gland A (ii) substance B and (iii) enzyme C ?

(b) Name the tube D.

(c) What is the movement E known as?

(d) What are (i) F (ii) G (iii) H ?

38. A unicellular animal P having no fixed shape ingests a food particle by forming temporary finger-
like projections Q. The food particle is engulfed with a little surrounding water to form a temporary stomach
R inside it. The chemicals S from surrounding cytoplasm enter into R and break down food into small and
soluble molecules by chemical reactions. The digested food is absorbed directly into cytoplasm by the
process T. The undigested food is thrown out of the body by the rupture of a cell organelle U in a process
called V.

(a) Name the unicellular animal P.

(b) What are (i) Q and (ii) R?

(c) Name (i) chemical S, and (ii) process T.

(d) Name organelle U and process V.

39. There are four organisms A, B, C and D. The organism A eats only the flesh of other animals as
food. The organism B can eat grains, fruits and vegetables as well as meat and fish. The organism C can make
the food itself from simple inorganic substances present in the environment by utilising sunlight energy. On
the other hand, organism D eats only plants and their products as food.

(a) Which organism is (i) omnivore (ii) herbivore, and (ii) carnivore?

(b) Which organism is an autotroph?

(c) Which organism is/are heterotroph(s)?

(d) Which organism can be a producer?

(e) Which organism is/are consumer (s)?

(f) Give one example each of organisms which could be like (i) A (ii) B (iii) C, and (iv) D