🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Biology
2
answers
0
watching
14
views
11 Dec 2019

What are the main components of a mature gymnosperm seed?

Select all that apply.

Select all that apply.

seed coat
food supply
embryo
pollen grain
megaspore
ovule
megasporangium

Watch
2
answers
0
watching
14
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Get unlimited access
Already have an account? Log in
Share
Patrina Schowalter
Patrina SchowalterLv2
13 Dec 2019
Get unlimited access
Already have an account? Log in
Share

Related textbook solutions

Molecular Cell Biology
8 Edition,
Lodish
ISBN: 9781464183393
Biology: Science for Life with Physiology
6 Edition,
Belk
ISBN: 9780134555430
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

1. A plant the lacks petals and has well-developed anthers ismost likely

pollinated by fruit-eatingmammals.
pollinated by bees.
pollinated by birds.

pollinated by wind.

2. SELECT EACH TYPE of tissue that may be found in a maturefruit or seed. Can be more than one

Diploid sporophyte tissue from theprevious generation
Triploid endosperm
Diploid embryonic tissue
Haploid sperm cells

Tissue from the female gametophyte

3. Based on the outcome for plants, a monkey eating a banana isa

parasite.
pollinator.
disperser.

fertilizer.

4. Select all of the environmentswhere seeds would be an advantage over spores. Can be more thanone

Deserts
Areas with unpredictablerainfall
Wet humid swamps
Open habitats with sparsevegetation

Under a dense forest canopy

5. Select all the advantages that seeds have over spores.

Seeds have increased droughtresistance.
Long term dormancy ispossible.
Sexual reproduction is onlypossible with seeds.
Nutrition is packaged with theembryo.

Widespread dispersal is possible with a seed coat.

6. Nectar is a sugar-laden liquid that is very energeticallyexpensive to produce. Why do plants allocate resources to produceit instead of just producing more flowers?

Nectar serves as an enticement forinsects.
Nectar is sticky and traps windborne pollen.
Nectar provides nutrition to thedeveloping embryo.

Nectar provides energy during pollen tube formation.

7.The dried pericarp that forms the peanut shell provideevidence that peanuts are

legumes.
drupes.
samaras.

pomes.


8. All members of the Anthophyta have

nectaries.
animal pollinators.
scented flowers.
ovules enclosed in carpels.

fleshy fruits for dispersal.

9. Why is external water not essential for fertilization in seedplants?

Ovules are contained within thepollen.
Sperm cells are used to transportpollen to the archegonia.
Seed plants use pollen instead ofsperm for fertilization.
The sperm cells in seed plants arecapable of resisting desiccation.

Pollen grains are transported by wind or an animal.

10.Select the true statements concerning seeds. Can be more thanone

Seeds allow for dormancy untilfavorable conditions arise.
The fruit provides nutrition to thedeveloping embryo.
The ovule dries and forms the seedcoat.
The seed stores all of thenutrition and water the embryo needs to germinate.
Seeds can resist conditions thatwould kill a live plant.

Seeds are key to wide dispersal of offspring.

11. Select the true statements concerning sperm and pollen. Canbe more than one.

In seed plants the entire malegametophyte is dispersed.
The pollen fertilizes the egg.
The pollen tube facilitates thepollination of the ovule.
Pollen transports the cells thatform the sperm but only the sperm fertilizes the egg.

Unlike mosses and ferns water is not needed for fertilization inseed plants.

12.Check which of the following are correct regarding thebenefit of seeds. Can be more than one.

Seeds protect the young embryo byenclosing it in several layers of gametophyte tissue.
Seeds provide a source ofnourishment to the embryonic plant.
The integument forms a seed coatthat protects against desiccation.
Seeds provide a structure in whicha dormant embryo can avoid unfavorable growing conditions andgerminate when conditions improve.

Seeds are a means to transport offspring away from the parentalplant.

13. A fruit-bearing dioecious flower would have

a gynoecium.
neither an androecium nor agynoecium.
an androecium.

both an androecium and a gynoecium.

14. A researcher brings a sample of dry soil to the lab, wetsit, provides ample amounts of fertilizer, and places the soil in acontainer in a greenhouse. Which type of plant would be leastlikely to emerge?

Corn
Sunflower
Liverwort
Wheat
Pine seedling

In a pine’s life cycle, hybrid “1” pine tree the needles were found to have the
alleles Ll (heterozygous) producing long needles. In a hybrid “2” pine tree, the
needles were found to have the alleles ll (homozygous recessive) producing
short needles. If a pollen from hybrid “1” pollinated hybrid “2” to form a hybrid “3”
plant which about 50% were long needle and 50% were short needle. Give the
genotypes for the following structures found in the life cycles of these plants:
Genotype of the pollen grain’s nucleus of plant hybrid “1”?
Genotype of archegonia of plant hybrid “2”?
Genotype of megaspore mother cell of plant hybrid “2”?
Genotype of sporophyte of plant hybrid “3”?
Genotype of microspores of plant hybrid “1”?
Genotype of hypocotyl of plant hybrid “3”?
Genotype of seed coat of plant hybrid “2”?
Genotype of ovary of plant hybrid “2”?

Draw and label the parts of the entire ovule and its content’s at maturity (before
fertilization) of the two Divisions “angiosperm” and “gymnosperm (pine)”. Explain
what happens to the various parts of each ovule. Give differences between
these two ovules.

Question 1: A slide of a terminal plant bud shows what physical characteristics demonstrating growth?

Answers:

1. an actively dividing group of cells between primordial leaves with undifferentiated vascular tissue

2. a vascular system with vascular bundles

3. spongy mesophyll tissue

4. sieve tubes, vessel elements and tracheids


Question 2: As the earth warmed and dried around 150 MYA, plants requiring _______ for fertilization were no longer dominant, but were eclipsed by plants that were ______ bearing named ___________ (literally naked seeds). These plants used _____ for fertilization freeing themselves from dependence on water. As animals of the era became terrestrial with means of terrestrial reproduction strategies, plants did the same using two different structures along with internal fertilization, the _____ being internal and fertilized by a wind carried _________ grain.

Answers:

1. water, seed, charophytya, dinosaurs, zygote, pollen

2. water, seed, gymnosperms, wind, egg, pollen

3. spores, cone, tracheids, water, pollen, embryo

4. water, flower, angiosperms, animals, spore, egg


Question 3: In the pith region of a stem the vascular system consists of two major structures;

Answers:

1. Phloem with trachieds and vessel elements and xylem with sieve-tubes and companion cells

2. Sclerechyma fibers and parenchyma cells

3. Phloem carrying photosynthesis products and xylem carrying water with dissolved nutrients

4. Phloem carrying water with dissolved nutrients and xylem carrying photosynthesis products.

Weekly leaderboard

Home
Homework Help 3,900,000
Biology 460,000
Start filling in the gaps now
Log in