3.1 Flowers Flashcards Preview

RHS Level 2 Module R2101 > 3.1 Flowers > Flashcards

Flashcards in 3.1 Flowers Deck (25)
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1

What are Sepals?

Outer whorl

Protection for the flower bud

Often green and photosynthetic

2

What are Petals?

Second whorl

Showy, attractive to wildlife - landing pad for bees

Sometimes modified to form NECTARIES at base of petals

3

What are Tepals?

When sepals and petals are very similar or indistinguishable

4

What is the Calyx?

A whorl of Sepals

5

What is the Corolla?

A whorl of Petals

6

What is the Androecium?

Third whorl

All the MALE reproductive structures

7

What is the Gynoecium?

Fourth whorl

All the FEMALE reproductive structures

8

What is a Stamen?

Male part made up from Filament and Anther

9

What is the Filament?

Male part - long stalk - holds the anther in best position to disperse pollen

10

What is the Anther?

Male part - on tip of filament that produces or contains pollen (male gamete)

11

What is the Carpel?

Female part - contains Ovary, Style, and Stigma

12

What is the Ovary?

Female part - contains Ovules. After fertilisation the Ovary wall forms the fruit.

13

What is the Style?

Female part - tube that leads to the Ovary - holds the stigma in the best position to receive pollen

14

What is the Stigma?

Female part - sticky receptive tissue on tip of Style - receives the Pollen

15

What are the Ovules?

Female part - inside the Ovary - go on to become seeds once fertilised.

16

What is the Receptacle?

This connects the stalk to all flower parts - goes on to become the "flesh" of the fruit in apples, pears and other members of the rose family.

17

What is the Pedicel?

The flower stalk - holds flower in best position for pollination and seed dispersal

18

What are the four Whorls of a flower?

1. Calyx (sepals)
2. Corolla (petals)
3. Androecium (male parts)
4. Gynoecium (female parts)

19

What does Monoecious mean?

A plant that has SEPARATE M/F structures on the same plant. (mono = same)

20

What does Dioecious mean?

A plant that has SEPARATE M/F structures on SEPARATE plants (dio = different)

21

State meaning of "Pollination"

The successful transfer of a plant's male reproductive cells (pollen) from their site of production (anther), to the receptive female tissue (stigma) on the tip of the style.

22

Characteristics of wind-pollinated plants (4):

Typically lack large petals and sepals - they are sometimes green or brown.

Stamens/anthers hang/dangle outside the flower to catch wind.

Stigmas often feathery with many lobes to catch pollen

Pollen may be smooth-surfaced or may have air bladders, lightweight, small, large quantities.

23

Characteristics of bee/insect-pollinated plants (4):

Typically showy, large, attractive petals

Other attractants such as scent and nectar guides and nectaries

Stamens large / anthers inside flower for insects to brush up against.

Pollen surface is rough

24

Meaning of the term, fertilisation:

The successful fusion of a male gamete (from pollen) with a female gamete (in the ovule) to form the embryo (or zygote)

25

What is a nectary?

A gland that produces nectar to attract pollinators into a flower