☰ Contents · Natural science

The life of plants, seeds and plants of Uzbekistan

Lessons 13–15 · 3 lessons · Y.V. Malikova. Natural Science Grade 3, Part 1. Novda Edutainment, Tashkent, 2023; Y.V. Malikova. Natural Science Grade 3, Part 2. Novda Edutainment, Tashkent, 2023
14

Plant seeds

Textbook: Part 1, pp. 60–63
GoalKnow what a seed is, what it needs to sprout, and the ways seeds spread (wind, water, animals, by themselves).
New words
seed · urug‘germination · unishdispersal · tarqalish
Explanation

A seed is the embryo of a future plant. The fruit protects the seed: an apple has several seeds, a plum has one. A seed needs water, warmth and air to sprout. Experiment: when seeds are put in water, those that sink are good, while floaters often will not sprout; on a damp napkin in a warm place the seed sprouts and sends out a root. For a new plant to find room, its seed must land far from the parent. Wind carries dandelion and maple seeds; water carries a coconut to the shore; burdock fruits cling to animal fur; a squirrel hides acorns and juniper seeds and forgets some; and the pod of a yellow acacia bursts open and scatters its seeds itself.

Worked examples
A dandelion seed has a fluffy parachute, so the wind carries it far.
If a squirrel hides an acorn and forgets it, a new tree may grow there.
Class activity

Sprout seeds: spread a damp napkin in a plastic container, put bean or pea seeds on it, cover with another damp napkin, keep it warm and moisten daily. Record in a diary: on which day did a root appear?

Practice
1
What does a seed need to sprout?
2
Why must a seed fall far from its parent plant?
3
Which seeds are spread by wind?
4
How is a burdock fruit spread?