Question:
In Pinus, the third tier of embryonal cells from below is known as
In Pinus, the third tier of embryonal cells from below is known as
Updated On: Jun 14, 2022
- rosette tier
- suspensor tierl
- embryonal tier
- free - nuclear tierl
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The Correct Option is A
Solution and Explanation
The cells of lower tier divide twice to form three tier of four cells each. At this stage the proembryo consists of $16$ cells arranged in four tiers. Each tier has a specific function.
(i) The lowermost tier is known as the embryonal tier, its cells divide to form embryo
(ii)The cells of the next tier called suspensor tier elongate to form suspensor.
(iii) The cells of $3^{rd}$ tier, known as the rosette tier conduct nourishment to the embryo.
(iv) The uppermost tier consisting of incomplete cells is known as nutritive tier and it provides nutrition.
(i) The lowermost tier is known as the embryonal tier, its cells divide to form embryo
(ii)The cells of the next tier called suspensor tier elongate to form suspensor.
(iii) The cells of $3^{rd}$ tier, known as the rosette tier conduct nourishment to the embryo.
(iv) The uppermost tier consisting of incomplete cells is known as nutritive tier and it provides nutrition.
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Concepts Used:
Post-Fertilization Events
There are series of events that happen in the development of plants after their fertilization process to form a fruit from a diploid zygote. The four different developmental steps that occurs during post fertilization are:
- Development of an Endosperm: The endosperm, a tissue, present in the seed during the fertilization, precedes the development of an embryo. It is categorized into three types.
- Nuclear Formation
- Cellular Formation
- Helobial Formation
- Development of an Embryo: Embryogeny is the embryo development process and it starts developing at the micropylar end of the embryo sac in the zygote. The formation stages of embryogeny are almost the same in both the plants dicot and monocot, regardless of their structure.
- Monocot Embryo
- Dicot Embryo
- Development of a Seed: A Seed has Three Body Parts:
- Seed Coat
- Cotyledon
- Embryo Axis
- Formation of a Fruit: After the cell division and separation in the ovary, it is changed into fruit because of stimuli received from fertilization just as developing seed. The pericarp which might be fleshy like guava, tomato, or cucumber or might be weathered and dry like pea, bean, or mustard. After all the events the two types of fruits are formed:
- True Fruit
- False Fruit