reproduction

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30 05, 2017

What are conifers? Pine trees, gymnosperms

By |2019-07-31T12:58:59-07:00May 30th, 2017|Biology|0 Comments

Pine trees - A Spruce tree is a type of gymnosperm and conifer Too dry for ferns and moss Near the end of the Carboniferous period, about 300 million years ago, the land on Earth got a lot drier than it had been before. It was drier because plate tectonics was bringing all of [...]

30 05, 2017

Collecting pine cones – Gymnosperms project

By |2018-04-16T10:35:31-07:00May 30th, 2017|Biology|0 Comments

Squirrel eats pine seeds from a cone Go take a walk outside in the fall and collect pine cones on the ground. How many different kinds of pine cones can you find? Can you figure out which tree makes which kind of pine cone? Sit quietly near a pine tree and watch squirrels [...]

30 05, 2017

Looking at flowers – Angiosperms project – Biology

By |2018-04-16T10:36:08-07:00May 30th, 2017|Biology|0 Comments

Daffodil with petals and pistil in the middle. Take a long walk around your neighborhood and the park in the late spring and look at all the flowers you see. Can you find ten different kinds of flowers? What does each of these flowers do to attract bees? Is it their color? Their [...]

30 05, 2017

What is a spore? – Plant reproduction – Biology

By |2018-04-13T23:51:51-07:00May 30th, 2017|Biology|0 Comments

Fern spores on the underside of a frond When plants like moss first began to grow outside the water, about 540 million years ago, they needed a way to reproduce themselves that didn't depend on water so much. Some of these plants evolved to be able to produce spores. To make spores, plants [...]

30 05, 2017

Seeds – Plant reproduction – Biology

By |2018-04-13T17:51:52-07:00May 30th, 2017|Biology|0 Comments

Evolution of seeds: Dandelion seeds What is a seed? A seed is the egg cell of a plant, with a hard wrapper around it so it can survive on its own. The earliest plants with seeds evolved from plants with spores during the late Devonian period, about 360 million years ago. The seeds [...]

30 05, 2017

Plant reproduction – Biology – Science

By |2018-04-13T17:52:39-07:00May 30th, 2017|Biology|0 Comments

Cell division The very earliest photosynthesizing plants on Earth, about 3 billion years ago, had only one cell, and they reproduced the way most one-celled creatures do, by mitosis: splitting themselves in half. By about two billion years ago, some of these cells began to split themselves in a more sophisticated way, called [...]

30 05, 2017

Haploid and diploid cells – Plant reproduction

By |2018-04-13T17:05:53-07:00May 30th, 2017|Biology|0 Comments

Human sperm cells with flagella (under a microscope) - They're haploid cells. When a cell divides by meiosis, it ends up with only half the amount of DNA it had before. That is a haploid cell. When two haploid cells join together to make one new cell with the regular amount of DNA, that's [...]

30 05, 2017

How flowers reproduce – Plant Biology

By |2019-06-11T05:29:37-07:00May 30th, 2017|Biology|0 Comments

Black-eyed Susan (the black in the middle is the seeds) - How flowers reproduce When did flowers evolve? The earliest flowers probably developed about 130 million years ago, in the Cretaceous period, as a way to attract newly evolved flying insects - mainly bees. When did bees evolve? The Cretaceous period All our [...]

30 05, 2017

Looking for spores – Plant Reproduction

By |2018-04-16T10:36:08-07:00May 30th, 2017|Biology|0 Comments

Sphagnum moss with spores standing up Wander around your back yard or a park until you find a fern. Look at the underside of one of the leaves. There are the spores! Walk around a little more unti you find some moss. Do you see tall thin sticks poking up out of the [...]

29 05, 2017

Eggs – Evolution and Biology

By |2019-05-24T11:37:23-07:00May 29th, 2017|Biology|0 Comments

Fish eggs: Egg evolution starts with soft eggs like these When did the first eggs evolve? The earliest living creatures made babies by dividing themselves in half, so that one cell became two cells. But about 1.4 billion years ago, some creatures with more than one cell began to develop specialized cells. These [...]