Answer: Option D. -> III and IV
:
D
Flowersare said to beunisexual if theypossesseither stamenor carpelbut not both.Thestamen (male part)of afloweristhe part that produces pollen andconsists offilamentandanther. A carpel or pistil(female part) consists of a stigma whichisthe part of the pistil where pollen is receivedand an ovary that housesthe female gamete. Based on this we can say that, stigma and ovary are present only infemale unisexual flowers.

:
Each point: 1 Mark
1. The transfer of pollen from the male reproductive organ (an anther or a male cone) of one plant to the female reproductive organ (a stigma or a female cone) of another plant iscross-pollination.
2. There are many agents of pollination like insects and wind.
3. Example of plant pollinated by -
(i) insects - sunflower
(ii) wind - wheat

:
Each point: 1 Mark
1. Vegetative parts- Parts of a plant which do not participate in sexual reproduction process are called vegetative parts. Roots, stems and leaves are the vegetative parts of a plant.
2. Reproductive parts- Parts of a plant which participate in the sexual reproduction process are called reproductive parts. Flowers, fruits, and seeds are called the reproductive parts of a plant.

:
Each method: 1 Mark
The different methods of asexual reproduction are:
1. Fission - It is a process of asexualreproduction in which a single cell splits to form two identical, independent cells.
2. Fragmentation - Parent body divides into distinct pieces which grow into new individuals. E.g. alga.
3. Budding - This is a process which occurs in yeasts. A bud or an outgrowth develops on the parent body. Once it attains maturation, it detaches from the parent body (sometimes can remain attached) to form a new individual.
4. Spore formation - Spores are asexual reproductive bodies. Each spore is covered by a hard protective coat to withstand unfavourable conditions.Under favourable conditions, it germinates and develops into a new individual. E.g. fungi.
5. Vegetative propagation- It is a type of asexual reproduction in which vegetative parts of the plant (roots, stems, and leaves) are involved.

:
Definition: 1 Mark
Example: 1 Mark
The flowers which contain both male reproductive part (stamen) and female reproductive part (pistil) are called bisexual flowers.
Example: Hibiscus.

:
Explanation: 2 Marks
Examples: 1 Mark
Cutting method is a technique of vegetative reproduction in plants. In this method, a branch of the stem is cut out from the plant and buried in the soil. New leaves arise from the nodes in the stem and the new roots also develop giving rise to a whole new plant.
Example- rose, sugarcane

:
Explanation: 1 Mark
Example: 1 Mark
In this mode of reproduction, one or more outgrowths of reproductive units called buds are formed on the parental body. Each bud consists of a small group of cells surrounded by the epithelium. A bud develops as a small outgrowth on the parent's body. It enlarges and develops the characteristics of the parent organism. A bud may become separated from the parent body and then develop into a new individual, or it may separate only after the completion of development. In some cases, the buds never separate and as a result, colonies of interconnected individuals are formed. As seen in yeast.

:
Each point: 1 Mark
1. The process by which an organism gives birth to young ones of its own kind is called reproduction.
2. Reproduction is essential for continuity of species.

:
Each point: 1 Mark
The advantages of vegetative propagation are
1. Itis a cheaper, easier and more rapid method of propagation in plants than growing plants from their seeds.
2. Plants which do not produce seeds can be propagated by this method.
3. The new plants are exact copiesof the parent plant.

:
Each reason: 1 Mark
Seed dispersal helps the plant
1. To prevent overcrowding.
2. To avoid competition for sunlight, water, and minerals.
3. To invade new habitats.