Look at the figure of pollination in pea below and answer the following questions. Name the pollination type and agent seen in the figure.

Cross-pollination sometimes also relies on other agents to transfer the pollen. They are abiotic and biotic agents. This figure is showing insect pollination. And the agent which is seen in the figure is honeybee. Insect pollination is a type of pollination in which the pollen of the plants are transferred by the means of insects. The flowers which show insect pollination are generally large, colourful, fragrant and rich in nectar to attract insects. A number of flowers are clustered into an inflorescence to make them conspicuous, when the flowers are small. The surface of pollen grains and stigma of these plants are sticky.

Look at the figure of pollination in pea below and answer the following questions. What are the adaptations taken by the flower for the process to occur?

Insect pollination is a type of pollination in which the pollen of the plants are transferred by the means of insects (e.g. bees, butterflies). The flowers that are pollinated by insects show the following characteristics- (i) A number of flowers are clustered into an inflorescence to make them conspicuous, if the flowers are small. (ii) Flowers are large, colourful, fragrant and rich in nectar to attract insects. (iii) The surface of pollen grains and stigma are sticky.

The figure shows the L.S of ovary at the time of fertilisation. Label the parts A-J.

L.S of ovary. A. Pollen grain- Pollen grains are inside the pollen and give rise to the male gametophyte of a seed plant. B. Pollen tube- A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. C. Male germ cell. D. Pollen tube- A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. E. Male germ cell. F. Egg cell- Egg cells develop in ovules, tiny structures embedded in the ovary at the base of the pistil. G. Polar nuclei- Either of the two nuclei of a seed plant embryo sac that are destined to form endosperm. H. Antipodal cell- The three haploid cells in the mature embryo sac of flowering plants that are situated at the opposite end to the micropyle. I. Embryo sac- An oval structure within an ovule of an angiosperm that contains the egg. J. Synergids- One of two small, short-lived nuclei lying near the egg in the mature embryo sac of a flowering plant.

The figure shows the L.S of ovary at the time of fertilisation. Define triple fusion.

The generative cell of the pollen of angiosperms divides and forms two male gametes during the growth of pollen tube into the stigma. The first male gamete fuses with the egg cell and forms a zygote. Second male gamete fuses with two polar nuclei to form a triploid Primary Endosperm Nucleus (PEN). This is called triple fusion. Since, two fusions, i.e. syngamy and triple fusion occur in an embryo sac, this is called double fertilisation. Central cell and primary endosperm nucleus called as Primary Endosperm Cell (PEC) develops into the endosperm and zygote develops into an embryo.