Answer: Option B. -> (A) – (II), (B) – (I), (C) –(IV), (D) –(III)
:
B
Syngamy is of 2 types endogamy and exogamy. Endogamy is self-fertilization, the gametes are from the same parent. For eg: tapeworm is bisexual and capable of self-fertilization.
Exogamy is cross fertilization, the gametes are from different parents. For eg: Rabbit isdioecious or unisexual animal.
Isogamy is when the fusing gametes are similar in morphology, that is shape, size and structure.
Anisogamy is when the fusing gametes are different in form, size and structure. Usually sexual reproduction is anisogamy.

Answer: Option C. -> Deoxyribonucleic acid
:
C
Lipids, Proteins, carbohydrates and nucleic acids are the four biological macromolecules. Nucleic acids that consist of ribonucleic acids and deoxyribonucleic acid, have many different biological roles including transfer of information and DNA molecules store and transfer inheritable genetic information.

Answer: Option A. -> Seed
:
A
Embryo is encapsulated in a seed. Pollen is a fine to coarse powdery substance comprising pollen grains which are male microgametophytes of seed plants.A fruit is the seed-bearing structure in flowering plants formed from the ovary after flowering. Embryo sac is the female gametophyte of a seed plant consisting of a thin-walled sac within the nucleus that contains the egg nucleus and other nuclei which give rise to endosperm on fertilization.

Answer: Option B. -> Anther
:
B
Meiosis occurs in Anther. In plants, meiosis occurs in the anthers to form pollen grains that is the male gamete, and within the ovary to form ovules. In meiosis a diploid cell divides in such a way so as to produce four haploid cells. These haploid cells form gametes. Stem tips and root tips are meristematic tissue that undergoes rapid mitotic divisions.

Answer: Option C. -> Both [A] and [R] are true and [R] is a correct explanation to [A]
:
C
Sexual dimorphism, the differences in appearance between males and females of the same species, such as in colour, shape, size, and structure is quite common among organisms that reproduce sexually.
The colorful feathers or plumage of a male peacock are used a as part of a courtship ritual in the hope of attracting the female's or peahen’s attention. The peacock with the best plumage often succeeds in being chosen as the mate. This is a clear example of a dimorphic trait being used to gain an advantage for sexual reproduction.

Answer: Option C. -> Monotremes
:
C
Monotremes (Prototheria) are mammals that lay eggs (Platypus is an example) instead of giving birth to live young like marsupials and other placental mammals. Marsupials are mammals that carry their young in a pouch. For example. kangaroo. And true placental mammals are characterized by the presence of the placenta, which facilitates exchange of nutrients and wastes between the blood of the mother and the fetus. The placental mammals include all living mammals except marsupials and monotremes. The placental mammals include diverse forms as whales, elephants, shrews, and armadillos.

Answer: Option C. -> Cladophora
:
C
Isogamete - a gamete indistinguishable in form, size, or behavior from the other gamete with which it unites to form a zygote. And Cladophora is an example for an organism that produces isogametes. Homo sapiens and fucus however produce gametes that are easily distinguishable morphologically called heterogametes. Theydiffer in form, size, behavior and occur typically as large nonmotile female gametes and small motile sperms.

Answer: Option B. -> Gametogenesis → Syngamy → Zygote → Embryogenesis
:
B
The answer is : Gametogenesis $\to$ Syngamy $\to$ Zygote $\to$ Embryogenesis
Events that lead to fertilisation is grouped under the pre-fertilisation events. These events basically consists of the formation of the gametes, a process called gametogenesis. Genesis meaning birth and gametogenesis, therefore meaning gamete birth. Apart from gamete formation, the pre-fertilisation events consists of gamete transfer, where one or both gametes can be moved or transferred to a location which is better suited for fertilisation or syngamy, that is fusion of gametes take place. After syngamy, a zygote is formed and then further development of the zygote is called embryogenesis.

Answer: Option A. -> Agave
:
A
Bulbils are the vegetative buds meant for vegetative propagation seen in Agave. Bulbils are small bulb-like structures, in a particular one in the axil of a leaf, which may fall to form a new plant.