11th Class Biology Chapter 9 Kingdom Plantae Short Question Answers
11th Class Biology Chapter 9 Kingdom Plantae Short Question Answers Below
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Class Bryopsida Mosses
Class Anthoceropsida Hornworts.
Sub division : Lycopsida Club mosses
Sub division : Sphenopsida Horse tails
Sub division : Pteropsida Ferns, seed plants
2.Special structures like rhizoids were developed for absorption of water and anchorage.
3.Heterogamy was evolved forming non-motile egg containing stored food and motile sperms.
4.Multicellular embroyo was formed which was retained inside the female reproductive body during its development.
A thick walled zygote that is formed after the fertilization of an Oospore.
A racemose inflorescence is which the flowers are sessile and borne on an elongated axis as in wheat.
No, only the angiosperms are also called flowering plants but not the gymnosperms.
These are the green algae.
It is the Selaginella.
A group of sporangia is known as a sorus in Adiantum.
The gametophyte of fern is also called as the prothallus. It has leaf like shape.
The seed producing plants are normally called spermatophytes.
A leaf, the blade of which is divided into several pieces or leaflets is called a compound leaf.
The ferns grow in moist and shady places on the hills and in the plants.
- Reproduction is not dependent on water.
- Sporophyte and gametophyte are independent generations.
- Mature liverwort and moss gametophyte.
- Mature liverwort and moss sporophyte.
Mature liverwort and moss gametophyte.
Although spores of Adiantum are also dispersed by wind, however when a spore falls on a moist soil, it germinates at suitable temperature and produces a haploid gametophyte or prothallus. But is case of wind-blown pollen grains, if they fall on soil, they are wasted, for their survival and development it is must for then to fall on the stigma f flower.
Megaspores are large since they have to store food for the growth of embryo.
One of the most significant events in the history of land plants was the development of seed habit. It was and important change in the reproductive system of the vascular plants. Technically as seed may be defined as a fertilized ovule. An ovule is an integument indehiscent mega sporangium, integuments are specialized protective coverings around mega sporangium which very in number. Mega sporangium is also called Nucleus. All seed producing plants are called spermatophytes.
Major steps in Evolution of seed:
The major steps associated with the evolution of seed habit are as follows:
- The evolution of heterospory
- Retention and germination of megaspore within the mega sporangium
- Development of protective layers around mega sporangium.
- Reduction to a single functional megaspore per sporangium.
- Development of an embryo sac within the sporangium.
- Modification of distal end of mega sporangium for pollen capture.
Having two long stamens and two short stamens in single whirl.
The structure that protects the developing reproductive parts of the flower.
The body of plant which is not differentiated into root, stem and leaves is called a thallus or thalloid plant body.
The parts of a typical carpel of flower are the ovary, style and stigma.
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