Morphology of Flowering Plants: Class 11 Biology Q&A
13 free answers on Morphology of Flowering Plants (Biology) for Class 11 students, across CBSE, ICSE and State boards. Includes questions such as “What is the difference between monocot and dicot stem?”, “Give a short description of the vascular system of dorsiventral leaves.”, “What are the two types of epidermis found in leaves of flowering plants?”
Question & Answer
Questions
- BiologyClass 11All
What is the difference between monocot and dicot stem?
Monocotyledonous (monocot) and dicotyledonous (dicot) plants are two major groups of angiosperms (flowering plants) distinguished by the number of cotyledons (seed leaves) in their seeds. Here are five differences between monocot and dicot stems: Vascular Bundles Arrangement: Monocot Stem: Vascular bundles are scattered throughout the stem without a specific arrangement. These bundles are numerous, small, and spread across the stem's ground tissue. Dicot Stem: Vascular
- BiologyClass 11All
Give a short description of the vascular system of dorsiventral leaves.
Solution: The vascular system in dorsiventral (dicot) leaves consists of vascular bundles present in veins and midrib. Structural Organization: Arrangement: Reticulate venation (net-like pattern) Midrib (central vein) → Secondary veins → Tertia
- BiologyClass 11All
What are the two types of epidermis found in leaves of flowering plants?
Solution: Leaves have two distinct epidermal layers: Adaxial Epidermis (Upper Epidermis) Abaxial Epidermis (Lower Epidermis) Detailed Comparison: Feature Adaxial Epidermis Abaxial Epidermis</st
- BiologyClass 11All
Why do monocotyledonous roots not undergo any secondary growth?
Monocotyledonous roots lack secondary growth due to the absence of vascular cambium. Detailed Explanation: Primary Requirement for Secondary Growth: Vascular cambium (fascicular + interfascicular) Cork cambium (phellogen) Why Monocots Lack Cambium: Embryological Constraint: Mon
- BiologyClass 11All
Explain briefly the modification of stem found in Pistia and Eichhornia.
Solution: Both Pistia and Eichhornia (water hyacinth) exhibit offsets—a type of vegetative propagation. Offsets are lateral branches with: Short internodes Rosette of leaves at each node Adventitious roots hanging in water Used for rapid asexual reproduction in aquatic plants
- BiologyClass 11All
What do you understand by the term venation? Explain its types.
Solution: Venation is the arrangement of veins and veinlets in the lamina (leaf blade). Types: Reticulate Venation Parallel Venation Veins form an irregular network Veins run parallel to e
- BiologyClass 11All
What are pitcher plants? Give example.
Pitcher plants are insectivorous plants in which leaves are modified into a pitcher-shaped structure to trap insects. The pitcher contains digestive enzymes that break down the prey to obtain nitrogen and other nutrients, supplementing their nutrition in nitrogen-deficient soils. Examples: Nepenthes (tropical pitcher plant), Sarracenia.
- BiologyClass 11All
What is the unit of gynoecium?
Solution: The fundamental unit of the gynoecium (female reproductive whorl) is the carpel or pistil, consisting of stigma, style, and ovary.
- BiologyClass 11All
What is the nature of ovary in an epigynous flower?
Solution: In epigynous flowers, the ovary is inferior. The thalamus (receptacle) encloses the ovary, and other floral parts (sepals, petals, stamens) appear to arise from above the ovary. Example: Guava, cucumber, sunflower.
- BiologyClass 11All
Name the phyllotaxy in Alstonia.
Alstonia exhibits whorled phyllotaxy, where three or more leaves arise from a single node in a circular pattern around the stem.
- BiologyClass 11All
What type of aestivation is found in Calotropis?
Calotropis displays valvate aestivation, where the margins of sepals or petals just touch each other without overlapping. This is typical of the family Apocynaceae (formerly Asclepiadaceae).
- BiologyClass 11All
What type of venation occurs in banana?
Solution: Banana exhibits parallel venation, where veins run parallel to each other from the base to the apex without forming a network. This is characteristic of monocotyledonous plants (Class Liliopsida).
- BiologyClass 11All
Which parts in ginger and potato are edible?
Ginger: The edible part is the rhizome, a modified underground stem that grows horizontally and stores food. Potato: The edible portion is a tuber, another modified underground stem characterized by swollen nodes called "eyes" (axillary buds). Key Point: Both are stems, not roots, as evidenced by the presence of nodes, internodes, and axillary buds.