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1 : Root hairs absorb salts from soil by:
A
:
Diffusion
B
:
Osmosis
C
:
Active transport
D
:
Filtration
2 : Which element is required by plants for the formation of chlorophyll?
A
:
Phosphorus
B
:
Calcium
C
:
Magnesium
D
:
Sulfur
3 : The transpiration is regulated by:
A
:
Mesophyll
B
:
Guard cells
C
:
Xylem
D
:
Phloem
4 : Which of the following plant nutrients is required in large amount?
A
:
Iron
B
:
Zinc
C
:
Potassium
D
:
Boron
5 : The primary function of root hair is:
A
:
Transport of nutrients
B
:
Storage of food
C
:
Increase surface area for absorption
D
:
Synthesis of proteins
6 : What is TRUE according to the pressure flow mechanism of food transport?
A
:
Water enters the source, creating pressure
B
:
Water is pulled from the sink
C
:
Movement of food in phloem is due to gravity
D
:
Solutes move from low to high concentration
7 : Which ion plays a role in the opening of stomata?
A
:
Sodium (Na+)
B
:
Potassium (K+)
C
:
Calcium (Ca²⁺)
D
:
Magnesium (Mg²⁺)
8 : In most plants, the food is transported in the form of:
A
:
Glucose
B
:
Sucrose
C
:
Starch
D
:
Maltose
9 : Under which condition will there be a high rate of transpiration?
A
:
High humidity
B
:
Low light intensity
C
:
Windy
D
:
Waterlogged
10 : Succulent organs are present in:
A
:
Xerophytes
B
:
Hydrophytes
C
:
Neophytes
D
:
Halophytes
11 : Water moves from the soil into root cells by:
A
:
Osmosis
B
:
Active transport
C
:
Diffusion
D
:
Bulk flow
12 : What happens during nitrogen deficiency in plants?
A
:
Leaves turn purple
B
:
Leaves turn yellow (chlorosis)
C
:
Stunted root growth
D
:
Increased fruit production
13 : Which nutrient deficiency causes yellowing of older leaves first?
A
:
Iron
B
:
Magnesium
C
:
Zinc
D
:
Chlorine
14 : Which tissue transports water in plants?
A
:
Phloem
B
:
Xylem
C
:
Cortex
D
:
Epidermis
15 : When do guard cells become turgid?
A
:
Night time
B
:
Evening
C
:
Afternoon
D
:
Day time
16 : Which tissue is responsible for transporting food in plants?
A
:
Xylem
B
:
Phloem
C
:
Cambium
D
:
Cortex
17 : Which cells provide energy for active transport in phloem?
A
:
Sieve cells
B
:
Parenchyma cells
C
:
Companion cells
D
:
Epidermal cells
18 : Root hairs absorb salts via:
A
:
Osmosis
B
:
Active transport
C
:
Diffusion
D
:
Phloem
19 : What force helps move water from roots to leaves?
A
:
Root pressure
B
:
Osmosis
C
:
Transpirational pull
D
:
Diffusion
20 : What is the outermost layer of the root?
A
:
Cortex
B
:
Epidermis
C
:
Pericycle
D
:
Xylem
21 : What kind of food is transported in plants?
A
:
Glucose
B
:
Sucrose
C
:
Starch
D
:
Fructose
22 : What is the shape of guard cells?
A
:
Round
B
:
Bean-shaped
C
:
Square
D
:
Triangular
23 : What is the role of phosphorus in plants?
A
:
Regulates stomata
B
:
Component of ATP and nucleic acids
C
:
Activates enzymes
D
:
Involved in osmosis
24 : Which process requires ATP?
A
:
Diffusion
B
:
Osmosis
C
:
Active transport
D
:
Passive transport
25 : Which of the following is a two-way transport system?
A
:
Xylem
B
:
Phloem
C
:
Cambium
D
:
Epidermis
26 : What factor increases transpiration by carrying away humid air?
A
:
Temperature
B
:
Wind
C
:
Humidity
D
:
Surface area
27 : What are lenticels?
A
:
Pores in leaves for gas exchange
B
:
Specialized pores in bark for gas exchange
C
:
Root hairs for water absorption
D
:
Structures for food storage
28 : What happens to water in the sieve tubes when sucrose is loaded into them?
A
:
Water moves out
B
:
Water evaporates
C
:
Water flows in by osmosis
D
:
Water becomes stagnant
29 : The apoplast pathway involves water movement through:
A
:
Cell membranes
B
:
Cytoplasm
C
:
Cell walls and intercellular spaces
D
:
Endodermis
30 : What process helps potassium ions move into guard cells during the day?
A
:
Diffusion
B
:
Osmosis
C
:
Active transport
D
:
Transpiration
31 : Osmosis involves the movement of:
A
:
Salts from soil to roots
B
:
Water across a semi-permeable membrane
C
:
Ions using energy
D
:
Food through phloem
32 : What is the function of molybdenum in plants?
A
:
Component of chlorophyll
B
:
Converts nitrates to ammonia
C
:
Activates enzymes
D
:
Involved in sugar transport
33 : What happens to the fluid pressure in sieve tubes at the source?
A
:
It decreases
B
:
It increases
C
:
It stays constant
D
:
It disappears
34 : What is the mechanism called that transports food in plants?
A
:
Transpirational pull
B
:
Active transport
C
:
Pressure flow mechanism
D
:
Osmosis
35 : On which surface of the leaf are more stomata usually found?
A
:
Upper surface
B
:
Stem surface
C
:
Lower surface
D
:
Petiole
36 : What is the loss of water from a plant's surface called?
A
:
Evaporation
B
:
Transpiration
C
:
Respiration
D
:
Photosynthesis
37 : Which plant excretes gums?
A
:
Ladyfinger
B
:
Acacia
C
:
Rubber plant
D
:
Rose plant
38 : In woody stems, gaseous exchange occurs through:
A
:
Stomata
B
:
Lenticels
C
:
Cuticle
D
:
Root hairs
39 : How do plants release extra carbon dioxide?
A
:
Through roots
B
:
Through stomata
C
:
Through phloem
D
:
Through xylem
40 : What happens when glucose concentration decreases in guard cells?
A
:
Stomata open
B
:
Water moves in
C
:
Guard cells lose turgor
D
:
Photosynthesis starts
41 : What structure is mainly responsible for transpiration?
A
:
Cuticle
B
:
Lenticels
C
:
Stomata
D
:
Epidermis
42 : Which of the following is a macronutrient?
A
:
Iron
B
:
Zinc
C
:
Nitrogen
D
:
Molybdenum
43 : Which nutrient is a major component of chlorophyll?
A
:
Calcium
B
:
Magnesium
C
:
Sulphur
D
:
Potassium
44 : When does carbon dioxide become a waste product in plants?
A
:
During photosynthesis
B
:
During transpiration
C
:
During the night
D
:
During guttation
45 : Which plant is an example of a mesophyte?
A
:
Cactus
B
:
Water lily
C
:
Maize
D
:
Sea grass
46 : When does guttation typically occur?
A
:
During the day
B
:
At night
C
:
During photosynthesis
D
:
In winter
47 : Which plant excretes latex?
A
:
Acacia
B
:
Conifers
C
:
Ladyfinger
D
:
Rubber plant
48 : Which layer regulates water entry in vascular tissues?
A
:
Epidermis
B
:
Cortex
C
:
Endodermis
D
:
Pericycle
49 : How do hydrophytes absorb water?
A
:
Through roots
B
:
Through stomata
C
:
Through the whole surface
D
:
Through succulent stems
50 : What happens to oxygen produced during photosynthesis?
A
:
Released into the environment
B
:
Used in respiration
C
:
Stored in leaves
D
:
Both (A) and (B)
51 : Which of the following is a hydrophyte?
A
:
Rose
B
:
Water lily
C
:
Cactus
D
:
Maize
52 : Which part of the plant allows gaseous exchange in leaves?
A
:
Lenticels
B
:
Stomata
C
:
Cuticle
D
:
Epidermis
53 : What is the primary source of energy for photosynthesis in plants?
A
:
Oxygen
B
:
Sunlight
C
:
Carbon dioxide
D
:
Water
54 : What helps xerophytes reduce water loss?
A
:
Broad leaves
B
:
Salt glands
C
:
Waxy cuticle
D
:
Stomata
55 : What are succulent organs?
A
:
Thick leaves
B
:
Storage tissues
C
:
Salty glands
D
:
Air-filled cavities
56 : Where do halophytes live?
A
:
In deserts
B
:
In freshwater
C
:
In salty water
D
:
On mountains
57 : What is the role of the cuticle in gaseous exchange?
A
:
Prevents gas exchange
B
:
Allows gas exchange
C
:
Stores oxygen
D
:
Produces carbon dioxide
58 : At night, plants primarily perform:
A
:
Photosynthesis
B
:
Respiration
C
:
Transpiration
D
:
Guttation
59 : During photosynthesis, plants release:
A
:
Carbon dioxide
B
:
Oxygen
C
:
Nitrogen
D
:
Water vapor
Biology 9th MCQs || Ilam Ghar
Biology 9th
Chapter 9 : Plant Physiology
