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Unit 1: Plant tissue culture laboratory layout - Practice Quiz

BTY559 — Biotechnology Laboratory-Ii 60 Questions
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1 What is the primary purpose of a plant tissue culture laboratory?

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A. Storage of harvested crop grains
B. Extraction of essential oils from plants
C. Testing soil fertility of farmlands
D. Aseptic growth of plant cells, tissues, or organs

2 Which of the following is the most important requirement in a tissue culture laboratory?

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A. Maintenance of aseptic conditions
B. Use of natural sunlight only
C. Availability of soil beds
D. Presence of large windows

3 Which equipment is primarily used for carrying out aseptic transfer of plant material?

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A. Laminar air flow cabinet
B. Rotary shaker
C. pH meter
D. Hot air oven

4 Which instrument is used for sterilization of media and glassware in a tissue culture lab?

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A. Colorimeter
B. Autoclave
C. Magnetic stirrer
D. Centrifuge

5 In which room are cultures kept under controlled light and temperature for growth?

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A. Washing room
B. Media preparation room
C. Office room
D. Culture/growth room

6 What is the typical temperature maintained in a plant tissue culture growth room?

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A.
B.
C.
D.

7 Which area of the laboratory is used for cleaning glassware and instruments?

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A. Washing room
B. Culture room
C. Transfer area
D. Inoculation chamber

8 Which type of light source is commonly used in the culture room for plant growth?

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A. Incandescent bulbs only
B. Fluorescent tubes
C. Infrared lamps
D. Ultraviolet lamps

9 The photoperiod (light/dark cycle) usually maintained in a culture room is about:

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A. 12 hours light and 4 hours dark
B. 8 hours light and 16 hours dark
C. 24 hours light and 0 hours dark
D. 16 hours light and 8 hours dark

10 Which room is used for weighing chemicals, preparing nutrient media, and adjusting pH?

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A. Washing room
B. Growth room
C. Storage room
D. Media preparation room

11 Why should a tissue culture laboratory be kept free from dust and drafts?

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A. To speed up media boiling
B. To improve natural lighting
C. To increase the room temperature
D. To reduce the chance of microbial contamination

12 What kind of flooring is preferred in a tissue culture laboratory?

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A. Smooth, washable, and non-porous
B. Rough and porous concrete
C. Wooden planks with gaps
D. Carpeted flooring

13 The HEPA filter present in a laminar air flow cabinet is used to:

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A. Add humidity to the air
B. Colour the air blue
C. Heat the incoming air
D. Remove microbes and particles from the air

14 Which of these is used to store prepared media and heat-sensitive chemicals?

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A. Hot air oven
B. Autoclave
C. Refrigerator
D. Laminar air flow

15 Which of the following is generally NOT a separate area in a tissue culture laboratory?

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A. Culture room
B. Animal housing room
C. Media preparation room
D. Washing room

16 Before starting work in the laminar air flow cabinet, the working surface is usually sterilized using:

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A. Distilled water
B. Cooking oil
C. Common table salt
D. 70% ethanol

17 The transfer/inoculation area of the laboratory should be located:

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A. Right next to the washing sinks
B. Outdoors near open windows
C. Away from the washing area to avoid moisture and contamination
D. In the same space as chemical storage

18 Which UV lamp is sometimes used to sterilize the air and surfaces of the transfer room?

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A. Germicidal UV lamp
B. Sodium vapour lamp
C. Incandescent lamp
D. Neon lamp

19 Cultures in the growth room are often placed on shelves called:

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A. Green houses
B. Culture racks
C. Soil beds
D. Compost bins

20 Which of the following is essential for maintaining constant temperature in the culture room?

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A. Ceiling fans only
B. Direct sunlight
C. Air conditioning system
D. Open windows

21 In an ideal plant tissue culture laboratory, the washing area should be located away from the aseptic transfer room. What is the primary reason for this arrangement?

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A. To reduce the risk of moisture, detergent residues, and airborne contaminants reaching the sterile transfer zone
B. To make the laboratory look symmetrical
C. To keep the washing staff separate from research scientists
D. To save electricity in the transfer room

22 A tissue culture facility must maintain the culture (growth) room at controlled conditions. Which combination is generally recommended for a standard culture room?

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A. Temperature with continuous light
B. Temperature with a 8 h light / 16 h dark photoperiod
C. Temperature with continuous darkness
D. Temperature with a 16 h light / 8 h dark photoperiod

23 Why is a laminar air flow (LAF) cabinet placed in a separate transfer/inoculation room rather than in the general preparation area?

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A. Because the transfer room can be kept clean and dust-free, providing an additional layer of protection during aseptic manipulations
B. Because it requires a special water supply available only in that room
C. Because it must be near the washing sinks
D. Because LAF cabinets are too heavy for the media room

24 A laboratory designer wants to minimise contamination during the workflow. Which sequence of rooms represents the correct logical flow of materials?

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A. Transfer room washing culture room media room
B. Washing/preparation media room transfer room culture (growth) room
C. Media room culture room washing transfer room
D. Culture room washing transfer room media room

25 The floors and walls of the aseptic transfer room are usually made of smooth, non-porous materials. What is the main advantage of this design choice?

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A. They can be easily cleaned and disinfected, leaving fewer surfaces for microbes to lodge
B. They improve the aesthetic appearance for visitors
C. They reduce the cost of construction significantly
D. They reflect more light for the cultures

26 Which piece of equipment is essential in the media preparation room but generally not required inside the aseptic transfer room?

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A. Laminar air flow cabinet
B. Autoclave
C. Bunsen burner or spirit lamp
D. Forceps and scalpel

27 In a well-designed tissue culture lab, why should the culture room have adjustable shelving with uniform light distribution?

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A. To ensure all culture vessels receive comparable light intensity for reproducible growth
B. To store heavy autoclaves safely
C. To increase the room temperature quickly
D. To allow easier washing of the shelves

28 A student notices high contamination rates in freshly inoculated cultures. Considering laboratory design, which factor is the most likely contributor?

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A. The transfer room is positioned adjacent to a dusty corridor with heavy foot traffic
B. The washing area has stainless steel sinks
C. The media room has a large autoclave
D. The culture room uses cool-white fluorescent lights

29 Why is it advisable to keep the stock culture / mother plant maintenance area physically separated from the main experimental culture room?

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A. Because stock plants need higher temperature
B. To protect valuable stock cultures from any contamination that may occur during routine experimental handling
C. To reduce the electricity bill of the culture room
D. Because stock plants do not require light

30 Which design feature best supports maintaining positive air pressure in the aseptic areas of a tissue culture laboratory?

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A. Installing large open windows for cross-ventilation
B. Keeping exhaust fans running at maximum in the clean room
C. Supplying filtered (HEPA) air into the clean room so that air flows outward when doors open
D. Placing the washing sinks inside the transfer room

31 A laboratory plans an area to observe cultures and take photographs without opening vessels. Which dedicated space serves this purpose?

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A. Autoclave room
B. Chemical storage room
C. Observation / data recording area
D. Washing area

32 Why should the media preparation room be equipped with a pH meter, balance, hot plate with magnetic stirrer, and refrigerator together in one place?

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A. So that all steps of accurate media formulation, mixing, and storage can be carried out efficiently in a single controlled zone
B. To reduce the number of staff needed
C. To allow cultures to be grown there
D. To keep the room warm

33 During laboratory design, which orientation of the LAF cabinet is preferred to maximise its effectiveness?

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A. Next to the washing sink for convenience
B. Away from direct doorways and high-traffic pathways to avoid disturbing the sterile air stream
C. Directly beneath an air-conditioning vent
D. Facing the main door for easy monitoring

34 A facility uses double-door entry (air-lock/change room) before the aseptic zone. What is the functional purpose of this design?

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A. It stores extra glassware
B. It acts as a buffer that prevents direct exchange of outside air and allows personnel to change/clean before entering
C. It provides emergency exits for staff
D. It doubles the working space available

35 Which of the following statements about the washing/cleaning area design is correct?

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A. It should be the innermost room next to the culture shelves
B. It should have large sinks, running deionised/distilled water, and drying racks, and be located near the media room but away from sterile zones
C. It should not contain any water supply
D. It must be maintained under positive air pressure like the transfer room

36 Why is overcrowding of equipment and personnel in the transfer room considered a poor design practice?

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A. It increases air turbulence and dust generation, raising the contamination risk during inoculation
B. It increases the electricity consumption of the LAF
C. It makes the room look untidy for inspections
D. It slows down the autoclave cycle

37 For energy efficiency and stable conditions, the culture room is often designed without external windows. What is the main reason?

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A. To make the room darker for storage
B. To keep temperature and photoperiod under precise artificial control, independent of outside weather and daylight
C. To reduce construction cost of glass
D. To prevent theft of cultures

38 Which combination of areas correctly represents the minimum functional zones required in a basic plant tissue culture laboratory?

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A. Washing/preparation area, media room, aseptic transfer room, and culture room
B. Washing area, cafeteria, and library
C. Only an aseptic transfer room and an office
D. Only a media room and a greenhouse

39 A designer specifies UV germicidal lamps in the transfer room. What is the correct guideline for their use?

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A. They should be switched on when the room is unoccupied and turned off before personnel enter to work
B. They should remain on continuously while staff inoculate cultures
C. They should replace the LAF cabinet entirely
D. They should be pointed directly at the culture shelves during growth

40 When planning the layout, why is the culture room usually placed at the innermost / farthest point of the laboratory sequence?

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A. Because it is the largest room
B. Because it holds the most sensitive incubating cultures and benefits from maximum isolation from external contamination sources
C. Because it requires the most water supply
D. Because it needs to be close to the entrance for visitors

41 A tissue culture facility experiences recurring fungal contamination in its transfer area despite HEPA-filtered laminar flow hoods. On analysis, the air pressure gradient shows the transfer room at Pa relative to the corridor. What is the most likely design flaw?

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A. The room temperature exceeds the optimal threshold
B. The laminar flow hoods are oriented parallel to the door swing
C. The HEPA filters are rated below MERV 13 efficiency
D. The transfer room should be maintained at positive pressure relative to adjacent areas

42 A lab designer must sequence four functional zones — washing, media preparation, aseptic transfer, and culture growth — to minimize contamination risk from a common workflow. Which zonal arrangement best reflects the principle of unidirectional 'dirty-to-clean' flow?

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A. Aseptic transfer → Washing → Media preparation → Culture growth
B. Washing → Media preparation → Aseptic transfer → Culture growth
C. Media preparation → Washing → Culture growth → Aseptic transfer
D. Culture growth → Aseptic transfer → Media preparation → Washing

43 In the growth (culture) room, cultures are illuminated by cool-white fluorescent tubes providing lux for a h photoperiod. Racks are stacked vertically with cm spacing. Explants on the top shelf show hyperhydricity while lower shelves grow normally. Considering room design, what is the most probable cause?

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A. Insufficient light intensity reaching the top shelf below lux
B. A shortened effective photoperiod on the upper shelf
C. Heat accumulation near the top from ballasts and poor vertical air circulation
D. Excessive concentration settling at the top of the room

44 A designer places the autoclave and media preparation bench in the same room. To meet both efficiency and safety, which orientation consideration is most critical?

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A. Providing dedicated exhaust ventilation for steam and heat near the autoclave
B. Ensuring the autoclave faces the laminar flow hood directly
C. Positioning the media bench under the room's main air inlet
D. Locating the autoclave adjacent to the culture growth room wall

45 The direction a laminar airflow cabinet faces relative to room doors and traffic is critical. Why is orienting the cabinet's open face directly toward a frequently-opened door a fundamental design error?

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A. The door's shadow reduces illumination inside the working zone
B. Door movement creates turbulent cross-drafts that disrupt the unidirectional sterile airstream
C. It increases the distance operators must walk to reach the cabinet
D. It causes the HEPA filter to clog faster due to dust from the door frame

46 A facility must decide floor and wall finishes for the aseptic transfer room. Which combination best satisfies the design objective of minimizing microbial harborage and easing decontamination?

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A. Carpeted anti-fatigue flooring with fabric-covered acoustic panels
B. Polished wooden flooring with unsealed brick feature walls
C. Coved seamless epoxy flooring with smooth non-porous painted walls
D. Textured ceramic tiles with grouted joints and porous plaster walls

47 Given a fixed rectangular building, a planner wants to minimize personnel and material back-tracking across contamination boundaries. Which layout principle most directly achieves this?

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A. Placing the most-used equipment nearest the building entrance
B. Arranging rooms in a linear sequence matching the workflow direction
C. Maximizing the number of interconnecting doors between rooms
D. Centralizing all cold storage in one corner of the facility

48 A growth room is designed for . The engineer must choose between one large central air-conditioning outlet and multiple distributed diffusers. For uniform culture conditions across all racks, which is preferable and why?

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A. One large central outlet, to maximize total cooling capacity at lowest cost
B. Multiple distributed diffusers, to avoid thermal gradients and localized draft on cultures
C. One large central outlet, because concentrated flow prevents dead air pockets
D. Multiple distributed diffusers, to reduce the required HEPA filtration area

49 During commissioning, particle counts in the transfer room meet ISO Class 7 at rest but fail 'in operation'. Considering laboratory design, which corrective measure addresses the root cause most effectively?

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A. Relocating the room farther from the building entrance
B. Repainting the walls with a glossier antimicrobial coating
C. Replacing fluorescent tubes with LED panels to reduce heat
D. Increasing air changes per hour to dilute operator-generated particles

50 A tissue culture lab plans a dedicated 'change/gowning' area. From a design-orientation standpoint, where should it be positioned?

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A. As an airlock buffer between the general lab and the aseptic transfer room
B. Directly inside the culture growth room next to the racks
C. At the far end of the washing area beside the sinks
D. Adjacent to the building exit for quick evacuation

51 A designer is deciding window orientation for the culture growth room. Why do most well-designed growth rooms deliberately have no external windows?

to study the orientation and design of plant tissue culture laboratory Hard
A. To reduce construction cost by eliminating glazing entirely
B. To satisfy fire-safety codes requiring windowless storage rooms
C. To prevent operators from being distracted during aseptic work
D. To maintain controlled photoperiod and temperature free from fluctuating sunlight

52 Two candidate layouts are compared. Layout A routes clean sterile media through the same doorway used to remove contaminated cultures for disposal. Layout B provides separate in/out routes. Which design defect does Layout A embody?

to study the orientation and design of plant tissue culture laboratory Hard
A. Excessive redundancy in the number of access points
B. Cross-flow of clean and waste materials creating a contamination bridge
C. Insufficient total floor area for the equipment installed
D. Poor natural lighting due to a single shared doorway

53 A hardening/acclimatization (greenhouse) area is being sited relative to the aseptic lab. Which orientation decision best protects the sterile core of the facility?

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A. Integrate it directly beside the aseptic transfer room for convenience
B. Position it between the washing area and the autoclave
C. Place it upstream of media preparation to pre-stage plantlets
D. Locate it downstream and physically separated as the final, least-sterile zone

54 An HVAC engineer must set the pressure cascade across four zones: corridor, gowning, transfer room, and growth room. Which cascade correctly protects the most critical (aseptic transfer) space?

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A. Corridor highest positive pressure, decreasing inward to the transfer room
B. Growth room highest positive, with transfer room at negative pressure
C. Transfer room highest positive pressure, decreasing outward through gowning to corridor
D. All four zones held at identical neutral pressure for balance

55 A small startup can afford only one clean-air device. It must choose between a horizontal laminar flow cabinet and a vertical (biosafety-style) cabinet for routine plant explant transfer. From a design-fit perspective, why is the horizontal laminar flow cabinet generally preferred here?

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A. It requires no HEPA filter, lowering maintenance costs significantly
B. It provides operator protection from hazardous plant pathogens
C. It delivers unobstructed sterile air across the work surface toward the operator, ideal for non-pathogenic plant work
D. It recirculates air through the room to sterilize the entire lab

56 In designing the media preparation area, a planner debates placing the meter, balances, and hot plates. Which arrangement principle minimizes measurement error and workflow disruption?

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A. Locate hot plates under the air inlet to disperse rising heat
B. Place balances directly beside the autoclave for immediate sterilization
C. Cluster all electrical instruments together at one central power point
D. Group instruments by sequential process step with vibration-sensitive balances away from hot plates

57 A quality audit finds that the laminar flow cabinet's pre-filter clogs rapidly in a lab where the cabinet sits directly opposite the washing sinks. What design-orientation correction is most appropriate?

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A. Switch the pre-filter to a coarser grade to slow clogging
B. Install a second cabinet beside the first to share the load
C. Relocate the cabinet away from aerosol- and moisture-generating wash activities
D. Increase the cabinet's blower speed to overcome the clogging

58 A facility wants to add a stock-solution cold store. Considering both design and workflow, where should refrigerators/freezers for media stocks ideally be positioned?

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A. Inside the aseptic transfer room next to the laminar flow cabinet
B. In the culture growth room to share its climate control
C. Beside the autoclave to buffer temperature fluctuations
D. Within or adjacent to the media preparation area, away from heat-emitting equipment

59 A designer models the aseptic transfer room and must decide ceiling height. Very high ceilings are discouraged in such rooms primarily because they:

to study the orientation and design of plant tissue culture laboratory Hard
A. Reduce the light intensity reaching the work benches below
B. Increase the air volume that must be filtered and conditioned, raising contamination risk and cost
C. Prevent the pressure cascade from being established at all
D. Make it impossible to mount HEPA filters at the correct angle

60 When laying out a combined teaching-and-research tissue culture lab, a planner must reconcile high student traffic with sterility. Which design strategy best balances these competing demands?

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A. Convert the entire lab into a single open-plan room for supervision ease
B. Allow students free movement through all zones to maximize learning exposure
C. Place the laminar flow cabinets near the main entrance for visibility
D. Physically segregate a controlled-access aseptic core from open general-work benches
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Unit 2