Pollination and fertilization

Pollination and fertilization

Colorized scanning electron microscope image of pollen grains from different plants. https://en.wikipedia.org/wiki/Pollen

Transferring pollen

• Pollen contains the male gametes

• Pollen must be carried from the anther to the stigma

Costa's hummingbird (Calypte costae) collecting nectar from the flowers of ocotillo (Fouquieria splendens).

Windblown pollen from a lodgepole pine. https://www.britannica.com/science/pollen

Pollination

The transfer of pollen from anther to stigma.

Multiple Select

Male gametes of flowering plants can be found in which of the following? Tick all that apply.

• stamen

• anther

• pollen

• pistil

Fill in the Blank

Pollen must be transferred from anther to ____________.

Multiple Choice

The diagram shows a process in plant reproduction.

Which process is represented by arrow X?

• fertilization

• pollen tube growth

• pollination

• seed dispersal

Tubes growing from pollens viewed under a microscope. https://www.saps.org.uk

Pollen tubes

Pollen grows a tube from the stigma down into the ovule. The male gamete goes down the tube and fuses with the female gamete inside an ovule.

Fertilization

The fusion of the nucleus of a male gamete and the nucleus of a female gamete.

Zygote

A new cell formed by fertilization.

Seed formation

• When the zygote starts to divide, it produces a little group of cells called an embryo

• The ovule begins to change and gradually becomes a seed

Pollen-tube growth and development of an embryo sac. https://www.researchgate.net

https://mammothmemory.net/biology/plants/sexual-reproduction-in-plants/ovary-fruit.html

https://sielearning.tafensw.edu.au/MPR/RTC2016A/html/pages/website/f_guide/fg_02.htm

Multiple Choice

What do you call the fusion of the nucleus of a male gamete to the nucleus of a female gamete?

• Pollination

• Fertilization

• Seed formation

• Pollen-ovule fusion

Multiple Choice

In plants, where is the female gamete produced?

• ovule

• style

• stigma

• anther

Fill in the Blank

A pollen ______ grows from the stigma down to the ovule.

Multiple Choice

Which statement is CORRECT?

• A zygote develops into an embryo.

• A zygote is larger than an embryo.

• A seed is an enlarged zygote.

• A seed is a plant embryo.

Summary

• Pollination is the transfer of pollen from the anther to the stigma.

• Fertilization is the fusion of the nucleus of a male gamete with the nucleus of a female gamete.

• Inside the ovule, a zygote divides to form the plant embryo. Also, the ovule changes and develops into a seed.

This photo deserves a second look. -Mr.Dennis

Poll

I will remember many of the things I learned in this lesson.

• Strongly agree.

• Agree

• Disagree

• Strongly disagree