Seed and Fruit Questions in English

(C) In $Pinus$, the process of reproduction is quite slow.
After pollination, the pollen tube grows slowly and reaches the archegonia.
Fertilization typically occurs about one year after pollination.
Following fertilization, the development of the embryo and the maturation of the seed take approximately another $6$ months.
Therefore, the total time lapse between fertilization and seed formation is approximately $1.5$ years (or $18$ months).

(D) Orchid seeds are characterized by being extremely small (minute) and lightweight. This adaptation allows them to be easily dispersed by the wind over long distances,which is crucial for their survival as they often require specific fungal associations for germination.

(C) In coconut,the fruit is a drupe. The outer fibrous part is the mesocarp,and the hard stony part is the endocarp. The kernel inside the endocarp is the seed. The thin,brown or blackish layer that adheres to the white kernel (endosperm) is the seed coat (testa),which is derived from the integuments of the ovule.

(B) The megasporangium in angiosperms is known as the ovule.
Upon fertilization and subsequent maturation,the ovule develops into a seed.
Therefore,the seed is defined as a fertilized and ripened ovule (mature integumented megasporangium) found in spermatophytes.

(A) After fertilization,the ovule matures into a seed. The integuments,which are the protective envelopes surrounding the ovule,harden and differentiate to form the seed coats. The outer integument forms the testa,and the inner integument forms the tegmen.

(B) The seed coat is formed by the integuments of the ovule.
After fertilization,the ovule matures into a seed.
The outer integument hardens to form the $Testa$,which is the outer seed coat.
The inner integument becomes thin and papery to form the $Tegmen$,which is the inner seed coat.
Therefore,the correct option is $B$.

(B) The micropyle is a small pore present on the seed coat,usually located adjacent to the hilum. During the process of seed germination,the micropyle facilitates the entry of water and oxygen into the seed,which is essential for the activation of metabolic processes and the emergence of the radicle.

(A) Seed viability refers to the ability of a seed to germinate after a certain period of time.
Among the given options,the seeds of $Nelumbo\, nucifera$ (lotus) exhibit the longest viability,which ranges from $400$ to $2000$ years.
Therefore,the correct option is $A$.

(A) After fertilization,the ovule undergoes significant physiological and structural changes to transform into a seed.
$1$. The fertilized ovule develops into the seed.
$2$. The ovary develops into the fruit.
$3$. The integuments of the ovule harden to form the seed coat (testa and tegmen).
$4$. Therefore,the correct answer is $A$ (Ovules).

(C) Non-endospermic or exalbuminous seeds are those in which the endosperm is completely consumed by the developing embryo during seed development.
Consequently,the mature seeds do not contain any endosperm.
In these seeds,the food reserves are stored in the cotyledons.
Examples include gram,pea,and bean.

(B) $Vivipary$ is the germination of seeds within the fruit $(in\, situ)$ while still attached to the parent plant.
The hypocotyl elongates and pushes the radicle out, but the seed and fruit remain hanging from the tree.
This phenomenon is commonly found in mangrove plants, such as $Rhizophora$ and $Sonneratia$.

(D) The entire content present inside the seed coat is known as the $Kernel$.
The $Kernel$ consists of the embryo,cotyledons,and endosperm (if present).
Therefore,the correct option is $D$.

(D) In most plants,the fruit develops only from the ovary,and these are called true fruits.
However,in some species,other floral parts such as the thalamus,calyx,or perianth (tepals) also contribute to fruit development.
Such fruits are known as false fruits or pseudocarps.
Examples include the apple (where the thalamus becomes fleshy) and strawberry.
Therefore,all the listed parts can be involved in the formation of false fruits.

(C) An apple is a false fruit (pseudocarp) because it develops from the thalamus along with the ovary. In an apple,the fleshy,edible part is the succulent thalamus,which surrounds the ovary.

(D) Seed dispersal is the movement or transport of seeds away from the parent plant.
$1$. It avoids competition between the parent plant and the offspring for resources like light,water,and nutrients.
$2$. It allows for the colonization of new areas,which can lead to the development of mixed populations in diverse habitats.
$3$. By spreading seeds to new locations,it facilitates the expansion of the species' range,which indirectly supports genetic diversity and cross-pollination opportunities in the next generation.
Therefore,all the given options are correct.

(A) The presence of an impermeable coating and air cavities in fruits and seeds is an adaptation for hydrochory (dispersal by water). These features help the seeds and fruits float on the water surface. Among the given options,$Nymphaea$ (water lily) exhibits these characteristics,such as a spongy seed coat that facilitates buoyancy.

(A) The fruits and seeds that possess sticky glands, hooks, or spines are adapted for dispersal by animals. This process is known as zoochory. Specifically, when these structures attach to the body of animals to be carried away, it is referred to as forced zoochory.
Examples include $Plumbago$, $Boerhaavia$, and $Cleome \text{ } viscosa$.

(C) The seeds of $Orchis$ are the smallest among $Angiosperms$,weighing approximately $0.004 \text{ g}$.
These seeds are extremely small,dry,and light in weight.
Due to their lightweight nature,they can be easily dispersed by wind over distances exceeding $1000 \text{ km}$.

(B) The correct answer is $B$.
Plants have evolved various adaptations to facilitate the dispersal of seeds and fruits by wind.
$1$. Seeds or fruits often possess light,feathery hairs (e.g.,Calotropis,cotton) that allow them to be carried over long distances by air currents.
$2$. Many fruits develop wing-like structures (e.g.,Acer,Hiptage,Dioscorea,and Fraxinus) that enable them to spin or glide through the air,increasing their time in flight.
$3$. Some plants have persistent styles that act like parachutes,helping them float in the air (e.g.,Clematis and Anemone).

(D) Compensated Zoochory refers to a process where animals (including humans) consume fruits and disperse the seeds as a result of their feeding behavior.
In the case of $Mango$,$Apricot$,and $Tomato$,these fruits are fleshy and nutritious,attracting various animals and humans who consume them and subsequently disperse the seeds to new locations.
Therefore,all the given examples represent cases of compensated Zoochory.

(D) Forced zoochory (also known as epizoochory) is a mechanism where seeds or fruits are dispersed by attaching themselves to the body of animals or humans using hooks,spines,or sticky substances.
$Plumbago$,$Cleome$,$Achyranthes$,and $Medicago$ are all well-known examples of plants that exhibit epizoochory,where their seeds possess specialized structures to cling to animal fur or clothing for dispersal.
Therefore,both $(a)$ and $(b)$ are correct examples.

(B) $Rafflesia$ is a parasitic plant known for its massive flowers. Its seeds are sticky and are primarily dispersed by large mammals,specifically elephants,which inadvertently carry the seeds on their feet as they walk through the forest floor.

(D) $Mulberry$ seeds are small and fleshy,making them attractive to birds. These seeds are capable of passing unharmed through the digestive tract of birds and animals,which facilitates their dispersal over long distances.

(D) The aril is a specialized outgrowth from the funicle or hilum that covers the seed.
In $Nymphaea$ (water lily),the aril is spongy and provides buoyancy,which helps the seeds float in water.
In $Litchi$,the aril is the fleshy,edible part that attracts animals,thereby facilitating seed dispersal.
Therefore,the aril serves both functions mentioned in $(a)$ and $(b)$.

(A) Plants that reproduce and disperse via seeds have a wider range of distribution compared to those using spores or vegetative propagation.
Seeds are multicellular structures that contain an embryo,a food supply,and a protective coat,allowing them to survive harsh environmental conditions and travel long distances via various agents like wind,water,or animals.
In contrast,spores are unicellular and lack the food reserves found in seeds,making them less resilient for long-distance dispersal and colonization of diverse habitats.

(D) The correct answer is $D$.
$Plumbago$, $Castor$, and $Linseed$ are examples of dicot seeds.
$Alisma$ is a monocot plant that produces non-endospermic (exalbuminous) seeds, which is an exception to the general rule that most monocots have endospermic seeds.

(B) In monocot seeds,the radicle is enclosed in an undifferentiated sheath called the coleorrhiza.
This structure protects the radicle and helps in the emergence of seminal roots.
In contrast,the plumule is covered by a protective sheath called the coleoptile.
Therefore,the correct option is $B$.

(B) The correct answer is $B$ (Anemochory).
$1$. Dust seeds are extremely small,dry,and light,which allows them to be easily dispersed by wind,for example,$0.0001 \ mg$ in $Orchis$.
$2$. Flattened fruits increase surface area,helping them remain afloat in the air,for example,$Dalbergia$ and $Albizzia$.
$3$. Balloon fruits are inflated,which makes them buoyant in the air,for example,$Cardiospermum$ and $Colutea$ (where the balloon is formed by a persistent calyx).

(A) Hydrochory is the dispersal of fruits and seeds by water.
For seeds and fruits to float on the surface of water,they must possess specific adaptations.
These adaptations include the development of floating devices (such as spongy or fibrous tissues) and a protective,water-resistant covering.
While buoyancy is a property,the physical phenomenon that allows small,light objects to remain on the surface of water without sinking is $Surface \ tension$.
Therefore,the correct answer is $A$.

(B) The fruit of the Apricot $(Prunus \text{ } armeniaca)$ is a fleshy drupe. These fruits are primarily consumed and dispersed by humans, which is a form of zoochory. Specifically, this is often categorized as anthropochory or dispersal by man.

(D) During the early stages of germination,the bean embryo is not yet capable of photosynthesis because it lacks fully developed leaves and chlorophyll.
Therefore,it relies on the energy stored in the form of starch,proteins,and fats within the cotyledons (seed leaves) of the seed.
These stored nutrients are broken down through respiration to provide the energy required for the growth of the radicle and plumule until the plant can produce its own food.

(A) Sexual reproduction,which occurs via seeds,is generally considered better for plants because it introduces genetic variation through recombination.
Seeds contain the embryo of the new plant,which is protected and nourished,allowing for dispersal and survival under diverse environmental conditions.
In contrast,propagation by tubers,bulbs,or rhizomes is a form of asexual reproduction (vegetative propagation),which produces clones and lacks genetic diversity.

(B) The correct answer is $B$.
In plants like $Asphodelus$ and $Ricinus$ (castor),the caruncle is a fleshy,outgrowth-like structure that develops from the integument of the ovule near the micropyle.
It is specifically derived from the outer integument,which becomes modified and enlarged to form this structure.

(D) Perisperm is the persistent,nutritive tissue derived from the nucellus that remains in the seed after fertilization. In some seeds,such as black pepper and beet,the nucellus is not completely consumed by the developing embryo and persists as a thin layer known as perisperm.

(B) In the development of a seed,the ovule transforms into the seed. The integuments of the ovule form the seed coat. The outer integument develops into the $Testa$ (outer seed coat),while the inner integument develops into the $Tegmen$ (inner seed coat).

(C) The correct answer is $C$. An $Aril$ is a specialized,collar-like outgrowth that arises from the base of the ovule and grows upwards to cover the seed,often functioning as a third integument. It is prominently seen in plants like $Litchi$ and $Asphodelus$. While a $Caruncle$ is also an outgrowth at the micropylar end of the seed (as in $Ricinus$ or $Castor$),the specific description of a collar-like structure forming a third integument refers to an $Aril$.

(A) After fertilization,the ovule develops into a seed.
The outer integument of the ovule differentiates into the seed coat known as the $Testa$.
The inner integument differentiates into the $Tegmen$.
The ovary wall develops into the $Pericarp$ (fruit wall).
Therefore,the correct option is $A$.

(C) In a coconut,the edible part is the endosperm.
The hard shell of the coconut is the endocarp.
The thin,brown or blackish layer that remains attached to the white kernel (endosperm) is the seed coat (testa).
Therefore,the correct answer is the seed coat.

(D) Most monocot seeds are endospermic (albuminous),meaning the endosperm is retained in the mature seed to provide nourishment to the developing embryo.
However,there are rare exceptions where the endosperm is consumed during seed development,resulting in non-endospermic (exalbuminous) monocot seeds.
$Alisma$ is a well-known example of a monocot that produces non-endospermic seeds.
$Plumbago$,$Castor$,and $Linseed$ are not monocots; $Plumbago$ is a dicot,and $Castor$ and $Linseed$ are endospermic dicot seeds.

(A) The process of formation of fruits without fertilization is known as parthenocarpy.
In this process,the ovary develops into a fruit without undergoing the fertilization process.
This is commonly used to produce seedless fruits,such as bananas and grapes.

(D) Parthenocarpy is the process of fruit development without prior fertilization. Since fertilization is required for seed formation,fruits produced through parthenocarpy are naturally seedless. This phenomenon can occur naturally or can be induced artificially using plant growth regulators like auxins and gibberellins.

(C) Parthenocarpy is the development of fruit without fertilization.
Naturally occurring parthenocarpy is observed in $Banana$.
In $Banana$,the fruit develops without the formation of seeds,making it a classic example of a naturally parthenocarpic fruit.

(D) The development of fruit without fertilization is known as parthenocarpy.
In $Vitis$ (grapes),seedless fruits are produced through this process,either naturally or induced by plant growth regulators.
Since fertilization does not occur,no seeds are formed within the fruit.

(B) Parthenocarpic fruits are fruits that develop without fertilization.
Since fertilization does not occur,these fruits are typically seedless.
Banana is a classic example of a naturally occurring parthenocarpic fruit.
Therefore,the correct option is $B$.

(B) Parthenocarpy is the development of fruit without fertilization, resulting in seedless fruits.
In $Pomegranate$ $(Punica \text{ } granatum)$, the edible part of the fruit is the succulent $testa$ (the outer layer of the seed).
If $Pomegranate$ fruits are produced by induced $parthenocarpy$, they will be seedless.
Since the seed (specifically the $testa$) is the part consumed by humans, the absence of seeds renders the fruit economically useless.
In contrast, for fruits like $Grape$, $Orange$, and $Banana$, seedlessness is often a desirable trait that increases their market value.

(A) Parthenocarpy is the process of fruit development without fertilization.
Seedless grapes are produced through stimulative parthenocarpy,where the stimulus of pollination triggers fruit development without the formation of seeds.
Therefore,the correct option is $A$.

(B) After fertilization in flowering plants, the following changes occur:
$1$. The $ovule$ develops into the $seed$.
$2$. The $ovary$ develops into the $fruit$.
$3$. The $ovary$ wall develops into the $pericarp$ (fruit wall).
Therefore, the correct sequence is that the $ovule$ becomes the $seed$ and the $ovary$ becomes the $fruit$.

(B) In $Angiosperms$ (flowering plants),the ovules are enclosed within the ovary. After the process of fertilization,the ovules mature into seeds,and the ovary ripens to form the fruit. This is a characteristic feature that distinguishes $Angiosperms$ from $Gymnosperms$,where seeds are naked and fruits are not formed.

(C) Angiosperms (flowering plants) are distinct from gymnosperms primarily because their seeds are enclosed within fruits,which develop from the ovary after fertilization.
In gymnosperms,the seeds are naked and not enclosed by any fruit wall.
While triploid endosperm is a unique feature of angiosperms resulting from double fertilization,the presence of seeds enclosed in fruits is the most fundamental morphological characteristic that defines the group 'Angiosperms' (meaning 'vessel-seeds').