In which type of aestivation does one margin of a sepal or petal overlap that of the next one, while the other margin is overlapped by the preceding one?
- Valvate
- Imbricate
- Vexillary
- Twisted
Explanation: In twisted aestivation, one margin of the appendage overlaps the next one, and the other margin is overlapped by the previous one (e.g., China rose, cotton).
What is the primary function of the 'Endosperm' in a developing seed?
- Respiration
- Food storage
- Protection
- Water absorption
Explanation: The endosperm is a tissue produced inside the seeds of most flowering plants following fertilization; it provides nutrients to the developing embryo.
In which plant is the petiole modified into a green, leaf-like structure called a 'Phyllode'?
- Pitcher plant
- Silk cotton
- Venus flytrap
- Australian Acacia
Explanation: In Australian Acacia, the leaves are small and short-lived; the petioles expand and become green to perform photosynthesis.
The mode of arrangement of sepals or petals in a floral bud with respect to other members is known as:
- Aestivation
- Phyllotaxy
- Placentation
- Inflorescence
Explanation: Aestivation describes the arrangement of sepals or petals in the floral bud (e.g., Valvate, Twisted, Imbricate, Vexillary).
A fruit like Apple or Strawberry that develops from the thalamus rather than the ovary is called a:
- Aggregate fruit
- Parthenocarpic fruit
- False fruit
- True fruit
Explanation: If the thalamus or other floral parts contribute to fruit formation along with the ovary, it is termed a false fruit.
In 'Axile' placentation, the placenta is located in which position?
- On the margin
- In the center
- On the wall
- At the base
Explanation: In axile placentation (Tomato, Lemon, China rose), the placenta is axial and the ovules are attached to it in a multilocular ovary.
The edible part of a potato (Solanum tuberosum) is a modified form of which plant organ?
- Underground stem
- Tap root
- Adventitious root
- Fleshy leaf
Explanation: Potato is an underground stem modification (tuber) used for food storage and vegetative propagation.
In which of the following plants are the leaves modified into spines for defense and to reduce transpiration?
- Cactus
- Pea
- Onion
- Silk cotton
Explanation: In plants like Opuntia (Cactus), leaves are modified into sharp spines to protect the plant and minimize water loss in arid environments.
The swollen leaf base found in some leguminous plants is technically referred to as the:
- Pulvinus
- Petiole
- Stipule
- Lamina
Explanation: In some plants, the leaf base may become swollen and is called a pulvinus, which helps in leaf movement.
In the Mango fruit (a drupe), which part of the pericarp is the edible fleshy portion?
- Mesocarp
- Endocarp
- Epicarp
- Pericarp
Explanation: Mango has a thin epicarp, a fleshy edible mesocarp, and an inner stony hard endocarp.
Which of the following plants utilizes leaf tendrils (modifications of leaflets) for climbing?
- Cucumber
- Grape vine
- Wild pea
- Watermelon
Explanation: In Sweet pea or Wild pea, the leaves or leaflets are modified into tendrils for climbing, unlike Gourds where the stem is modified.
A sterile stamen that does not produce pollen is technically called a:
- Staminate
- Pistillode
- Staminode
- Polyadelphous
Explanation: A staminode is a sterile stamen that is incapable of producing functional pollen grains.
A flower that can be divided into two equal radial halves in any radial plane passing through the center is:
- Actinomorphic
- Bilateral
- Asymmetric
- Zygomorphic
Explanation: Actinomorphic flowers (radial symmetry), such as Mustard and Chili, can be divided into identical halves through any vertical plane passing through the center.
The thorns of Citrus and Bougainvillea are structural modifications of which part?
- Stipules
- Leaves
- Stems
- Roots
Explanation: Thorns are woody, straight, and pointed structures that develop from axillary buds (stem modification) for protection.
The term 'Perianth' is used for a flower when which of the following occurs?
- Stamens are epipetalous
- Petals are fused
- Sepals are large
- Calyx/Corolla indistinguishable
Explanation: When the calyx and corolla are not distinct, they are collectively called the perianth (e.g., Lily).
In which specific region of the root are the root hairs found for water absorption?
- Meristematic region
- Elongation region
- Root cap
- Maturation region
Explanation: Root hairs are fine, delicate, thread-like structures that differentiate from the epidermal cells in the region of maturation.
In a 'Racemose' type of inflorescence, the flowers are borne laterally in which order?
- Whorled order
- Acropetal order
- Alternate order
- Basipetal order
Explanation: In racemose inflorescence, the main axis continues to grow, and flowers are produced laterally in an acropetal succession (youngest at the top).
Which specialized structure covers and protects the young radicle in a monocotyledonous seed?
- Scutellum
- Aleurone
- Coleoptile
- Coleorhiza
Explanation: In monocots, the radicle and root cap are enclosed in an undifferentiated sheath called the coleorhiza.
The large, shield-shaped single cotyledon of a monocotyledonous seed is known as the:
- Tegmen
- Hypocotyl
- Epicotyl
- Scutellum
Explanation: The single cotyledon of monocot seeds (especially grasses) is large and shield-shaped, termed the scutellum.
Which type of placentation is observed in 'Dianthus', where ovules are borne on the central axis without septa?
- Free central
- Parietal
- Marginal
- Axile
Explanation: In free central placentation (Dianthus, Primrose), ovules are borne on a central axis and septa are absent.
The 'Offset', a modification for vegetative propagation in aquatic plants, is characteristically seen in:
- Strawberry
- Jasmine
- Grass
- Pistia
Explanation: In aquatic plants like Pistia and Eichhornia, a lateral branch with short internodes and a rosette of leaves is called an offset.
Which type of placentation is characteristic of the Fabaceae (Pea) family?
- Parietal
- Basal
- Axile
- Marginal
Explanation: In marginal placentation, the placenta forms a ridge along the ventral suture of the ovary and ovules are borne on this ridge.
In 'Imbricate' aestivation, the petals or sepals overlap in which specific manner?
- One-way overlapping
- Regular spiral
- Irregular overlapping
- No overlapping
Explanation: In imbricate aestivation (Cassia, Gulmohur), margins overlap but not in any particular direction.
In a Maize grain, the proteinaceous outer layer of the endosperm is called the:
- Coleorhiza
- Aleurone layer
- Coleoptile
- Scutellum
Explanation: In monocot seeds like maize, the outer covering of the endosperm separates the embryo by a proteinaceous layer called the aleurone layer.
Which of the following describes the type of flower found in Rose and Peach?
- Perigynous
- Monogynous
- Epigynous
- Hypogynous
Explanation: In perigynous flowers, the gynoecium is in the center and other parts are on the rim of the thalamus at the same level; the ovary is half-inferior.
When the ovary is situated on the thalamus while other parts are situated below it, the flower is:
- Perigynous
- Hypogynous
- Monogynous
- Epigynous
Explanation: In hypogynous flowers (e.g., Mustard, Brinjal), the gynoecium occupies the highest position, and the ovary is said to be superior.
Which structure protects the tender apex of the root as it makes its way through the soil?
- Root hair
- Meristem
- Epiblema
- Root cap
Explanation: The root is covered at the apex by a thimble-like structure called the root cap, which protects the sensitive growing point.
The outer thin skin of a fleshy fruit like Mango is scientifically referred to as the:
- Pericarp
- Endocarp
- Epicarp
- Mesocarp
Explanation: The pericarp (fruit wall) is differentiated into an outer epicarp, a middle mesocarp, and an inner endocarp.
In plants like Mustard and Wheat, the type of venation observed in the leaves is respectively:
- Parallel and Reticulate
- Reticulate and Parallel
- Both Reticulate
- Both Parallel
Explanation: Dicot plants (Mustard) typically show reticulate venation, while monocots (Wheat) generally show parallel venation.
In which of the following plants are the carpels fused together (Syncarpous condition)?
- Magnolia
- Rose
- Lotus
- Mustard
Explanation: When carpels are fused, as in Mustard and Tomato, they are called syncarpous. When free (Lotus, Rose), they are apocarpous.
Which root system is typically found in monocotyledonous plants like Wheat, replacing the short-lived primary root?
- Tap root
- Prop root
- Stilt root
- Fibrous root
Explanation: In monocots, the primary root is short-lived and is replaced by a large number of roots originating from the base of the stem, forming the fibrous root system.
In the 'Silk Cotton' tree, the leaf is a classic example of which type?
- Pinnately compound
- Simple leaf
- Palmately compound
- Whorled leaf
Explanation: In palmately compound leaves, the leaflets are attached at a common point, i.e., at the tip of the petiole.
When the stamens of a flower are united into one single bunch or bundle, the condition is:
- Diadelphous
- Polyadelphous
- Monadelphous
- Epipetalous
Explanation: In the monadelphous condition (e.g., China rose), all stamens are fused together into a single tube or bundle.
In plants like Banyan, roots that arise from parts of the plant other than the radicle are called:
- Tap roots
- Tertiary roots
- Adventitious roots
- Fibrous roots
Explanation: Adventitious roots arise from any part of the plant other than the radicle, such as the stem or branches, common in Banyan and Grass.
Which term describes a flower that can be divided into two similar halves only in one particular vertical plane?
- Radial symmetry
- Actinomorphic
- Zygomorphic
- Asymmetric
Explanation: Zygomorphic (bilateral symmetry) flowers, like Pea and Gulmohur, can be divided into two equal halves only in one plane.
In the Vexillary aestivation characteristic of the pea family, the largest petal is called the:
- Standard
- Keel
- Corona
- Wings
Explanation: Vexillary aestivation has five petals: one large 'standard' overlapping two 'wings', which in turn overlap two small fused 'keels'.
Which of the following exhibits 'Whorled' phyllotaxy?
- Guava
- Calotropis
- China rose
- Alstonia
Explanation: In whorled phyllotaxy, more than two leaves arise at each node and form a circle or whorl (e.g., Alstonia).
Which of the following describes 'Phyllotaxy', the pattern of arrangement of leaves on a stem?
- Leaf arrangement
- Leaf duration
- Leaf attachment
- Leaf venation
Explanation: Phyllotaxy is the mode of arrangement of leaves on the stem or branch, categorized as alternate, opposite, or whorled.
In an 'Epigynous' flower, such as in Guava or Cucumber, the ovary is considered:
- Half-superior
- Inferior
- Half-inferior
- Superior
Explanation: In epigynous flowers, the thalamus grows upward to enclose the ovary completely and fuses with it; the other floral parts arise above the ovary.
Plants like Onion and Lily belong to which family, characterized by a perianth?
- Asteraceae
- Fabaceae
- Liliaceae
- Solanaceae
Explanation: Liliaceae is a monocot family where the calyx and corolla are not distinct and are called the perianth.
The mode of arrangement of flowers on the floral axis is scientifically termed as:
- Venation
- Aestivation
- Phyllotaxy
- Inflorescence
Explanation: Inflorescence refers to the arrangement and distribution of flowers on the peduncle or floral axis.
A monocarpellary superior ovary with marginal placentation and 10 diadelphous stamens belongs to:
- Asteraceae
- Solanaceae
- Liliaceae
- Fabaceae
Explanation: These are the characteristic floral features of the Fabaceae (Legume) family.
The persistent calyx (sepals that remain with the fruit) is a hallmark feature of which family?
- Fabaceae
- Liliaceae
- Solanaceae
- Brassicaceae
Explanation: In the Solanaceae family (e.g., Brinjal, Tomato), the calyx is often persistent and stays attached even after the fruit matures.
Which specific root modification is observed in Rhizophora to help the plant obtain oxygen in swampy areas?
- Prop roots
- Nodulated roots
- Pneumatophores
- Stilt roots
Explanation: Pneumatophores are respiratory roots that grow vertically upwards out of the soil to fetch oxygen for respiration in marshy habitats.
When stamens are attached to the petals, the condition is referred to as:
- Epipetalous
- Syngenesious
- Epiphyllous
- Monadelphous
Explanation: Stamens attached to petals are epipetalous (Brinjal). If attached to the perianth (Lily), they are epiphyllous.
Which modified stem grows horizontally underground, has nodes/internodes, and stores food?
Explanation: A rhizome (e.g., Ginger, Turmeric) is a thick, underground horizontal stem used for storage and perennation.
Regarding stem modifications, which of the following is an example of a 'Phylloclade' found in arid regions?
- Opuntia
- Strawberry
- Ginger
- Colocasia
Explanation: In Opuntia, the stem becomes flattened, green, and fleshy to perform photosynthesis, a modification known as a phylloclade.
The 'Diadelphous' condition, where stamens are united into two bundles, is most commonly found in:
- Pea
- Citrus
- China rose
- Sunflower
Explanation: In Pea (Fabaceae), there are 10 stamens arranged in two bundles (9 fused + 1 free), known as the diadelphous condition.
Which of the following plants possesses 'Stilt roots' arising from the lower nodes of the stem?
- Sugarcane
- Asparagus
- Banyan tree
- Sweet potato
Explanation: Stilt roots are supporting roots coming out of the lower nodes of the stem, found in Maize and Sugarcane.
In a monocotyledonous seed, the thin seed coat is generally fused with which structure?
- Endosperm
- Embryo
- Scutellum
- Fruit wall
Explanation: In cereals like Maize, the seed coat is membranous and usually fused with the fruit wall (caryopsis).
Which of the following is a 'Drupe' fruit where the endocarp is hard and stony?
Explanation: Mango and Coconut are drupe fruits, characterized by a fleshy mesocarp (mango) or fibrous mesocarp (coconut) and a stony endocarp.
Non-endospermic (ex-albuminous) seeds, where endosperm is consumed during development, are found in:
Explanation: In most dicots like Pea, Gram, and Bean, the endosperm is not present in the mature seed as it is used up by the developing embryo.
In which plant is the stem modified into a 'Tendril' to help the plant climb?
- Bougainvillea
- Euphorbia
- Citrus
- Cucumber
Explanation: Stem tendrils are slender, spirally coiled structures that develop from axillary buds to help plants climb (e.g., Gourds, Grapevines).
The scars on a seed coat through which the developing seeds were attached to the fruit are called:
- Tegmen
- Hilum
- Micropyle
- Testa
Explanation: The hilum is a scar on the seed coat that marks the point of attachment to the funiculus (stalk) of the fruit.
A 'Parthenocarpic' fruit is biologically defined as a fruit that develops:
- Without sunlight
- Without fertilization
- From underground stems
- Without seeds
Explanation: Parthenocarpic fruits (like Banana) develop without the process of fertilization and are generally seedless.
In 'Parietal' placentation, the ovules develop on the:
- Inner wall
- Base of ovary
- Central axis
- Ventral suture
Explanation: In parietal placentation (Mustard, Argemone), ovules develop on the inner wall of the ovary or on peripheral parts.
In a dicotyledonous seed, the embryonic axis specifically consists of which two parts?
- Endosperm and tegmen
- Scutellum and coleoptile
- Hilum and micropyle
- Radicle and plumule
Explanation: The embryo in a dicot seed consists of an embryonic axis (with a radicle at one end and a plumule at the other) and two cotyledons.
Which type of aestivation is seen in Calotropis, where the margins of sepals or petals do not overlap?
- Valvate
- Imbricate
- Vexillary
- Twisted
Explanation: In valvate aestivation, sepals or petals in a whorl just touch one another at the margin without any overlapping.
In a 'Cymose' type of inflorescence, the main axis of the flower cluster:
- Terminates in flower
- Lacks flowers
- Shows acropetal order
- Grows indefinitely
Explanation: In cymose inflorescence, the main axis terminates in a flower, hence has limited growth. Flowers are borne in a basipetal order.
The 'Basal' type of placentation is characteristic of which of the following families?
- Brassicaceae
- Solanaceae
- Fabaceae
- Asteraceae
Explanation: In basal placentation (Sunflower, Marigold), the placenta is at the base of the ovary and a single ovule is attached to it.