Morphology Of Flowering Plants Flashcards
(64 cards)
Tap roots of……..and adventitious roots of……….get swollen and store food.
carrot turnip
sweet potato
Statement 1: hanging structures that support a banyan tree are called prop roots.
Statement 2: Similarly, the stems of maize and sugarcane have supporting roots coming out of the lower nodes of the stem called stilt roots
Both are correct
In majority of the…………. plants, the direct elongation of the radicle leads to the formation of primary root which grows inside the soil.
dicotyledonous
Statement 1: In monocotyledonous plants, the primary root is short lived and is replaced by a large number of roots.
Statement 2: These roots originate from the base of the stem and constitute the fibrous root system, as seen in the wheat plant
Both are correct
The main functions of the root system are state 4 given in NCERT
absorption of water and minerals from the soil
providing a proper anchorage to the plant parts
storing reserve food material
synthesis of plant growth regulators.
The cells of this region are very small, thin-walled and with dense protoplasm.
Name the region
Region of meristem
Cells of ………. region are responsible for growth of root in lengths
Region of elongation
Regions of roots
Proximal to distal
Maturation—> elongation—>meristematic—>root cap
Asparagus shows root modification for storage
True
It shows fasciculated fleshy roots
Underground stems of (5) are modified to store food in them
potato
ginger
turmeric
zaminkand
Colocasia
Statement 1: Stems can never act as organs of perennation to tide over conditions unfavourable for growth.
Statement 2: Stem tendrils which develop from terminal buds, are slender and spirally coiled and help plants to climb such as in gourds (cucumber, pumpkins, watermelon) and grapevines.
Both statements are incorrect
Stems act in such way as an organ of perennation
Stem tendrils arise from axillary buds and not from terminal buds
Difference between terminal and axillary buds
Terminal buds are found at the tip of a plant stem and are responsible for the primary growth and elongation of the plant. They usually inhibit the growth of axillary buds, a phenomenon known as apical dominance.
Axillary buds are located in the axil of a leaf where the leaf joins the stem. They can develop into a branch or flower and become active if the terminal bud is removed or if certain environmental conditions encourage their growth.
Statement 1: Thorns are found in many plants such as Citrus, Bougainvillea
Statement 2: These thorns are woody, straight and pointed modified from terminal buds
Statement 1 is correct but 2 is incorrect
These are modified from axillary buds and not terminal buds
Statement 1: Some plants of arid regions modify their stems into flattened (Opuntia), or fleshy cylindrical (Euphorbia) structures.
Statement 2: They contain chlorophyll and carry out photosynthesis
Both are correct
What are runners
Underground stems of some plants
These spread to new niches and when older parts die new plants are formed.
Found in grass and strawberry.
What is stolon
A slender lateral branch arises from the base of the main axis and grows aerially for some time
Then arch downwards to touch the ground and at that point new plant arises
In plants like mint and jasmine
What is offset
Lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots
Is found in aquatic plants like Pistia and Eichhornia
What are suckers
Lateral branches originate from the basal and underground portion of the main stem
These grow horizontally beneath the soil and then come out obliquely upward giving rise to leafy shoots
In banana, pineapple and Chrysanthemum.
Statement 1: Leaves originate from shoot apical meristems and are arranged in an basipetal order.
Statement 2: A typical leaf consists of three main parts: leaf base, petiole and lamina
Statement 1 is incorrect
These are borne in acropetal order
Statement 1: In dicotyledons, the leaf base expands into a sheath covering the stem partially or wholly.
Statement 2: In some non-leguminous plants the leafbase may become swollen, which is called the pulvinus
Both are incorrect
In MONOCOTS the leaf base expands into a sheath covering the stem partially or wholly. In some LEGUMINOUS plants the leafbase may become swollen, which is called the pulvinus
Statement 1: A leaf is said to be simple only when its lamina is entire
Statement 2: When the incisions of the lamina reach up to the midrib breaking it into a number of leaflets, the leaf is called compound.
I is incorrect
If the leaf is incised and the incisions do not touch the midrib this is also considered as simple leaf
A bud is present in the axil of petiole in both simple and compound leaves as well as in the axil of leaflets of the compound leaf.
False
Not present in axil of leaflets
Statement 1: In a pinnately compound leaf a number of leaflets are present on a common axis, the rachis, which represents the midrib of the leaf as in neem.
Statement 2: In palmately compound leaves, the leaflets are attached at a common point, i.e., at the tip of petiole, as in silk cotton.
Both are correct
Alternate phyllotaxy is in
china rose
mustard
sun flower
All families in the syllabus
Fabeaceae
Solanaceae
Malvaceae
Brassicaceae
Asteraceae
Poaceae
Liliaceae (sometimes whorled also)
