Question for Plant Life Cycles & Alternation of Generations Try yourself: Which of the following is incorrect about haplontic life cycle? A. Gametophytes are the dominant phase in this life cycle B. Sporophytes are free-living C. Spores are haploid in nature and form gametophyte by mitotic division D. Zygote acts as sporophyte Explanation Gametophytes are the dominant phase in this life cycle. Sporophytes don’t have free living existence. Spores are haploid in nature and form gametophyte by mitotic division. Zygote acts as Sporophyte that forms spores. View Solution

Gametophytes are the dominant phase in this life cycle

Spores are haploid in nature and form gametophyte by mitotic division

Question for Plant Life Cycles & Alternation of Generations Try yourself: Which among the following is incorrect about diplontic life cycle? A. Sporophyte is the dominant phase B. All spermatophytes exhibit diplontic life cycle C. Gametophyte depends on the sporophyte D. Sporophyte depends on Gametophyte for their food Explanation Sporophyte is the dominant phase. All spermatophytes exhibit diplontic life cycle. Gametophyte depends on the Sporophyte. Sporophyte has independent existence and can perform photosynthesis and hence can prepare their own food. View Solution

Sporophyte is the dominant phase

All spermatophytes exhibit diplontic life cycle

Gametophyte depends on the sporophyte

Sporophyte depends on Gametophyte for their food

Question for Plant Life Cycles & Alternation of Generations Try yourself: Which among the following is incorrect about Haplo-diplontic life cycle? A. In this life cycle, both sporophytic phase and gametophytic phase have equal life time B. Both sporophytic and gametophytic phases are multi-cellular and have independent existence C. This kind of life cycle is exhibited by Pteridophytes and Bryophyte D. Ectocarpus exhibits haplo-diplontic life cycle Explanation In this life cycle both the sporophytic and gametophytic phase are multi-cellular and have independent existence. In this life cycle, the dominant phases differ. This kind of life cycle is exhibited by Pteridophytes and Bryophytes. Ectocarpus exhibits haplo-diplontic life cycle. View Solution

In this life cycle, both sporophytic phase and gametophytic phase have equal life time

Both sporophytic and gametophytic phases are multi-cellular and have independent existence

This kind of life cycle is exhibited by Pteridophytes and Bryophyte

Ectocarpus exhibits haplo-diplontic life cycle

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Plant Life Cycles & Alternation of Generations Video Lecture - Biology Class 11 - NEET

	Biology Class 11 268 videos\|542 docs\|326 tests

Biology Class 11

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	Test: Algae (NCERT)
	Test: Classification Systems (NCERT)
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	Test: Bryophytes - 2

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FAQs on Plant Life Cycles & Alternation of Generations Video Lecture - Biology Class 11 - NEET

1. What is alternation of generations in plant life cycles?

Ans. Alternation of generations refers to the reproductive strategy in plants where they alternate between a multicellular diploid phase called the sporophyte and a multicellular haploid phase called the gametophyte. In this cycle, the sporophyte produces spores through meiosis, which then develop into gametophytes. The gametophytes produce gametes through mitosis, which then fuse to form a zygote, giving rise to a new sporophyte generation.

2. How does the alternation of generations contribute to plant reproduction?

Ans. Alternation of generations is essential for plant reproduction as it allows for the production of both gametes and spores. The sporophyte generation produces spores through meiosis, which are dispersed and develop into gametophytes. The gametophytes then produce gametes through mitosis, which fuse during fertilization to form a zygote. This zygote develops into a new sporophyte, completing the cycle and ensuring the continuation of the plant species.

3. What are some examples of plants that exhibit alternation of generations?

Ans. Examples of plants that exhibit alternation of generations include mosses, ferns, and flowering plants. In mosses, the dominant generation is the gametophyte, while in ferns and flowering plants, the dominant generation is the sporophyte. Each of these plants goes through a distinct cycle of alternating between sporophyte and gametophyte generations.

4. How does the alternation of generations contribute to genetic diversity in plants?

Ans. The alternation of generations in plants contributes to genetic diversity through two key processes: meiosis and fertilization. During meiosis, the sporophyte generation produces haploid spores, each with a unique combination of genetic material. These spores develop into gametophytes, which produce gametes through mitosis. When gametes from different gametophytes fuse during fertilization, they combine their genetic material, resulting in offspring with new combinations of genes. This genetic diversity allows plants to adapt to changing environments and increases their chances of survival.

5. How does the alternation of generations differ between different plant groups?

Ans. The alternation of generations can differ between different plant groups in terms of the relative dominance of the sporophyte and gametophyte generations. In some plants, such as mosses, liverworts, and hornworts, the gametophyte generation is dominant and the sporophyte generation is relatively small and dependent on the gametophyte. In contrast, in ferns, gymnosperms, and flowering plants, the sporophyte generation is dominant and the gametophyte generation is relatively small and short-lived. Additionally, the structures and reproductive strategies of the sporophyte and gametophyte generations can vary among different plant groups.

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	Biology Class 11 268 videos\|542 docs\|326 tests

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268 videos|542 docs|326 tests

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Timeline

00:00	Introduction
00:19	Life cycle of Fern
01:44	Patterns of Lifecycle in Plants
01:57	Haplontic Lifecycle
02:46	Diplontic Lifecycle
02:46	Question 1
03:10	Question 2
03:11	Haplo-diplontic Lifecycle
04:38	Question 3
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