What is a node in a plant stem?
a) A point where leaves are attached
b) The space between two leaves
c) A type of root structure
d) A point of nutrient storage Answer: a) A point where leaves are attached
What is the primary function of an internode?
a) Photosynthesis
b) Water storage
c) Support and elongation of the stem
d) Nutrient absorption Answer: c) Support and elongation of the stem
Which part of the stem develops into a leaf or flower?
a) Node
b) Internode
c) Axillary bud
d) Petiole Answer: a) Node
What typically occurs at a node?
a) Leaf formation
b) Root development
c) Flowering
d) Seed dispersal Answer: a) Leaf formation
What is the distance between two successive nodes called?
a) Node length
b) Internode length
c) Bud length
d) Leaf length Answer: b) Internode length
Which type of plant generally has shorter internodes?
a) Herbaceous plants
b) Woody plants
c) Climbing plants
d) Aquatic plants Answer: b) Woody plants
What determines the length of an internode?
a) Environmental conditions
b) Genetic factors
c) Type of plant
d) All of the above Answer: d) All of the above
What can excessive internode elongation lead to in plants?
a) Increased stability
b) Stunted growth
c) Weak stems and lodging
d) Enhanced photosynthesis Answer: c) Weak stems and lodging
Which structure develops at the axil of a leaf node?
a) Main root
b) Bud
c) Internode
d) Petiole Answer: b) Bud
What type of growth occurs at nodes and internodes during primary growth?
a) Lateral growth
b) Apical growth
c) Secondary growth
d) Horizontal growth Answer: b) Apical growth
In some plants, nodes may develop into what additional structures?
a) Flowers
b) Thorns
c) Adventitious roots
d) All of the above Answer: d) All of the above
What role do internodes play in climbing plants?
a) Providing rigidity
b) Reducing weight
c) Facilitating attachment to supports
d) Storing nutrients Answer: c) Facilitating attachment to supports
How do internodes contribute to a plant’s overall height?
a) By absorbing sunlight
b) By elongating between nodes
c) By developing more leaves
d) By storing water Answer: b) By elongating between nodes
What type of tissue primarily makes up the internodes of stems?
a) Parenchyma
b) Collenchyma
c) Sclerenchyma
d) Vascular tissue Answer: d) Vascular tissue
Which plant hormones influence internode elongation?
a) Auxins
b) Cytokinins
c) Gibberellins
d) Both a and c Answer: d) Both a and c
What happens to the internodes of a plant during drought stress?
a) They elongate
b) They shorten
c) They remain unchanged
d) They thicken Answer: b) They shorten
In monocots, what is a common feature regarding internodes?
a) They are all of equal length
b) They are solid
c) They have a hollow structure
d) They do not exist Answer: c) They have a hollow structure
How do nodes and internodes differ in their structure?
a) Nodes contain vascular bundles, while internodes do not
b) Nodes are thicker than internodes
c) Internodes are elongated, while nodes are compact
d) There is no difference Answer: c) Internodes are elongated, while nodes are compact
Which plant part is directly influenced by the position of the node?
a) Root
b) Leaf
c) Flower
d) All of the above Answer: d) All of the above
What type of stem has distinct nodes and internodes?
a) Rhizome
b) Tuber
c) Stolon
d) True stem Answer: d) True stem
Which type of growth results in the thickening of stems at the nodes?
a) Primary growth
b) Secondary growth
c) Tertiary growth
d) Lateral growth Answer: b) Secondary growth
What is a characteristic feature of a node in herbaceous plants?
a) It is woody.
b) It has no leaves.
c) It is often swollen or thicker.
d) It does not produce flowers. Answer: c) It is often swollen or thicker.
Which of the following is true regarding axillary buds at nodes?
a) They can develop into flowers.
b) They always remain dormant.
c) They are found only on the main stem.
d) They do not contribute to plant growth. Answer: a) They can develop into flowers.
What is the effect of pruning on nodes and internodes?
a) It promotes leaf growth only.
b) It encourages new shoot development from nodes.
c) It reduces root growth.
d) It has no effect. Answer: b) It encourages new shoot development from nodes.
How do environmental factors influence internode length?
a) They have no impact.
b) They can cause variations in growth patterns.
c) They solely determine leaf shape.
d) They reduce nutrient uptake. Answer: b) They can cause variations in growth patterns.
Which structure can form at the nodes of some plants to aid in vegetative reproduction?
a) Stolon
b) Rhizome
c) Bud
d) All of the above Answer: d) All of the above
In what way do internodes affect the light exposure of leaves?
a) They block sunlight.
b) They determine the angle of leaves.
c) They have no effect on light exposure.
d) They promote leaf growth in shade. Answer: b) They determine the angle of leaves.
What is a possible consequence of excessive internode elongation in a plant?
a) Improved stability
b) Enhanced nutrient absorption
c) Increased susceptibility to wind damage
d) Faster growth Answer: c) Increased susceptibility to wind damage
How can the study of nodes and internodes help in plant breeding?
a) By determining root depth
b) By influencing flower color
c) By selecting for desirable plant height and form
d) By enhancing disease resistance Answer: c) By selecting for desirable plant height and form
What can be inferred about a plant with very short internodes?
a) It is likely a climbing plant.
b) It is adapted to grow in low-light conditions.
c) It may be a drought-resistant species.
d) It is likely a fast-growing species. Answer: c) It may be a drought-resistant species.