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Why Autumn Leaves Fall

By Janice VanCleave

Autumn Tree by David Paul Ohmer

Deciduous tree leaves fall in autumn due to a breakdown in cells connecting the leaves to stems. The decreased sunlight in autumn produces a chemical that destroys the connecting cells.

Filed Under: Biology, Plants Tagged With: abscission zone, deciduous leaves, hormones, petiole

How Desert Plants Survive

By Janice VanCleave

public domain http://www.clipartpal.com/clipart_pd/plants/cactus1.html

Desert Plant Adaptations and Survival Desert plants have physical and behavioral mechanisms that help them to adapt the climate of the desert. What is a Desert? A desert is a place that most think of as being very hot and arid (dry).  Actually, all deserts are arid, but temperature-wise there are both hot and cold deserts. […]

Filed Under: Biology, Plants Tagged With: cacti, plant adaptation, xerophytes

The Blooming of a Paper Flower

By Janice VanCleave

A stick-on label with a message is placed in the center of a paper flower.

Introduction to the Science At Home Series: Project 1: Fun With Water Investigation: The Blooming of a Paper Flower Andrea Roseman, a homeschooling mom with two lovely children, tested this experiment and posted comments on her website, WhatEverPhilippians48. Andrea and I exchanged ideas and with her approval, I have included her hints, clues, and suggestions to […]

Filed Under: Biology, Plants Tagged With: dependent variables, experimental investigation, exploratory investigation, homeschool science, variables

Chia Seed Science Projects Ideas

By Janice VanCleave

How to Write a Science Project Question An Experimental Science Project is a Cause/Effect investigation. In other words, the change in one thing causes something else to change. The “Cause” part of the investigation is what you will have control over. The “Effect” part of the investigation is what you will be observing to decide […]

Filed Under: Biology, Plants Tagged With: controlled variables, dependent variable, germination rate, independent variable

Why Dead Leaves Stay Attached to Stems

By Janice VanCleave

Brown Leaves on Fallen Branch

When a branch or even a stem is cut from a deciduous tree, why do the leaves stay attached to stems? http://en.wikipedia.org/wiki/Abscission Special cells attach deciduous leaves to stems. In autumn, decreased sunlight triggers the production of chemicals that breakdown the walls of the attaching cells. This results in the leaves falling off of the […]

Filed Under: Biology, Plants Tagged With: deciduous leaves, falling leaves

Chia Seeds: Physical Properties

By Janice VanCleave

Chia Seeds

Investigation of Physical Properties Objective: To observe and describe the physical properties of both dry and wet Chia seeds. Science Terms: hydration– to fill with waterphysical properties– Characteristics used to identify something; physical properties include: color, size, shape and texture.relative size- A comparison of the size of an object to something with a familiar size; as big […]

Filed Under: Biology, Plants Tagged With: dehydration, relative size

Growing Chia Seeds

By Janice VanCleave

Chia Planters These are forms made with the same clay as clay flower pots are made of .  I wonder…Will chia seeds grow on pieces of clay pots? Let’s Find Out! Materialssmall bowl1/4 cup (63 mL) measuring cuptap water2 teaspoons (10mL) Chia seedscontainerbroken pottery pieces (nurseries might provide the broken pieces of clay pottery)misting bottle […]

Filed Under: Biology, Plants Tagged With: Chia planters

The Fastest Moving Plant

By Janice VanCleave

To date, the fastest moving plant is the White Mulberry (Morus alba). The flower of this mulberry tree shoots pollen at speeds around 200 meters per second. The flower is able to shoot pollen so quickly because its stamens work like medieval catapults. How a Catapult Works A catapult is known as a trebuchet, which […]

Filed Under: Biology, Plants Tagged With: plant movement

Chlelate: Chlorophyll

By Janice VanCleave

Chlorophyll is an organic molecule. The basic  organic molecule is composed of carbon and hydrogen. More complex organic compounds contain carbon, hydrogen, and other elements such as oxygen and nitrogen. A chelate is an organic  compound with a central metal ion. Chlorophyll is one of the most important chelates in nature. In the diagram, the […]

Filed Under: Biology, Plants Tagged With: chelate, chlorophyll, organic molecule, photosynthesis

Paper Flowers

By Janice VanCleave

Instructions to fold a four-petal flower cut from newspaper demonstrates absorption and capillary action. are folded

 

Filed Under: Plants Tagged With: absorption, capillary action, paper flower, paper flowers

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Welcome to Janice’s Science Extravaganza!

The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

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