Pteridophytes Quiz

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What are the two protein-rich unicellular algae used as food supplements by space travellers?

Chlorella & Spirulina

What are the pigments responsible for the grass-green color in algae?

Chlorophyll a & b

What are the two layers that make up the rigid cell wall of algae?

Inner cellulose layer and outer pectose layer

Name two methods of reproduction in algae.

Vegetative reproduction and sexual reproduction Signup and view all the answers

What are gemmae and how do they develop new individuals?

Gemmae are green, multicellular, asexual buds that develop in small receptacles on the thalli. They are detached from the parent body and germinate to form new individuals. Signup and view all the answers

Describe the two stages of the gametophyte in mosses.

The two stages of the gametophyte in mosses are the Protonema stage and the Leafy stage. Signup and view all the answers

Where are the male and female sex organs produced in mosses?

The male and female sex organs in mosses are produced at the apex of leafy shoots. Signup and view all the answers

What is the predominant stage of the life cycle of a moss?

The gametophyte is the predominant stage of the life cycle of a moss. Signup and view all the answers

Describe the adaptations in conifers that help in reducing water loss.

Thick cuticle, sunken stomata, and reduced surface area of needle-like leaves. Signup and view all the answers

What is the term used to describe the production of haploid microspores and megaspores in gymnosperms?

Heterospory. Signup and view all the answers

How are sporophylls arranged in Cycas to form cones or strobili?

Sporophylls are compactly and spirally arranged along an axis. Signup and view all the answers

What is the name of the compact male gametophyte in Cycas that develops from microspores?

Pollen grain. Signup and view all the answers

What is the dominant phase in bryophytes?

Gametophyte Signup and view all the answers

What structures bear sporangia in pteridophytes?

Sporophylls Signup and view all the answers

What do spores germinate to give in pteridophytes?

Prothallus Signup and view all the answers

What are the male and female sex organs in the gametophytes of pteridophytes called?

Antheridia and archegonia Signup and view all the answers

What is the difference between homosporous and heterosporous pteridophytes?

Homosporous pteridophytes produce similar kinds of spores, while heterosporous pteridophytes produce two kinds of spores: macro (mega) and micro spores. Signup and view all the answers

How do female and male gametophytes arise in heterosporous plants?

Megaspores and microspores germinate to give rise to female and male gametophytes respectively. Signup and view all the answers

What is the significance of zygotes developing into young embryos within female gametophytes?

This event is considered a precursor to the seed habit and an important step in evolution. Signup and view all the answers

How do gymnosperms differ from angiosperms in terms of ovule structure?

Gymnosperms have ovules that are not enclosed by an ovary wall and remain exposed before and after fertilization, while angiosperms have ovules enclosed within an ovary. Signup and view all the answers