Answer
397.2k+ views
Hint: Gymnosperms are defined as the association of seed-producing plants but they do not elicit flowers. These seeds formulate either on the covering of scales or leaves, which are always adapted to form cones, or isolated as in English yew plants. They are heterosporous. They have different female and male gametes.
Complete answer:
All vascular plants possess a sporophyte-dominant life cycle and the fairly short-lived gametophytic phase. The gametophytes i.e. microspores and megaspores are diminished in size. The ploidy of sporophyte is diploid and of the gametophyte is haploid.
Microgametophytes (Male gametophyte i.e. pollen grain) mature from microspores and elicits sperm cells while Megagametophytes (female gametophyte) develop from megaspores and are protected inside the ovule. The pollen tube evolves towards the megasporocyte (2n), which further undergoes meiosis and evolves into megaspores. The megaspores will grow up into eggs (1n).
The seed that originated in gymnosperms includes 3 generations of tissues: Seed coat and nucellus that arises from the sporophyte tissue, the gametophyte that will give nutrients, and the daughter sporophyte i.e. embryo itself.
Hence, the correct answer is option (A).
Note: The gymnosperms along with angiosperms comprise the spermatophytes or seed plants. The biggest organization of inhabiting gymnosperms are the conifers, gnetophytes and Ginkgo biloba. Gametophytic generation is dominant over a sporophytic generation and the sporophyte is dependent on the gametophyte. In the life sequence of a conifer, the sporophytic phase is the lengthiest.
Complete answer:
All vascular plants possess a sporophyte-dominant life cycle and the fairly short-lived gametophytic phase. The gametophytes i.e. microspores and megaspores are diminished in size. The ploidy of sporophyte is diploid and of the gametophyte is haploid.
Microgametophytes (Male gametophyte i.e. pollen grain) mature from microspores and elicits sperm cells while Megagametophytes (female gametophyte) develop from megaspores and are protected inside the ovule. The pollen tube evolves towards the megasporocyte (2n), which further undergoes meiosis and evolves into megaspores. The megaspores will grow up into eggs (1n).
The seed that originated in gymnosperms includes 3 generations of tissues: Seed coat and nucellus that arises from the sporophyte tissue, the gametophyte that will give nutrients, and the daughter sporophyte i.e. embryo itself.
Hence, the correct answer is option (A).
Note: The gymnosperms along with angiosperms comprise the spermatophytes or seed plants. The biggest organization of inhabiting gymnosperms are the conifers, gnetophytes and Ginkgo biloba. Gametophytic generation is dominant over a sporophytic generation and the sporophyte is dependent on the gametophyte. In the life sequence of a conifer, the sporophytic phase is the lengthiest.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why Are Noble Gases NonReactive class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
At which age domestication of animals started A Neolithic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)