A student indentified the various parts of an embryo of a gram seed and listed them as given below: (I) Testa (II) Plumule (III) Radicle (IV) Cotyledon (V) Tegman. Out of these the actual parts of the embryo are:
A student indentified the various parts of an embryo of a gram seed and listed them as given below: (I) Testa (II) Plumule (III) Radicle (IV) Cotyledon (V) Tegman. Out of these the actual parts of the embryo are:
Options
The correct option is B (II, III, IV).
Explanation:
- An embryo of a seed consists of three primary parts:
- Plumule (II): The future shoot.
- Radicle (III): The future root.
- Cotyledon (IV): The food store/seed leaf.
- Testa (I) and Tegmen (V) are the outer and inner layers of the protective seed coat, respectively. They are protective coverings and are not considered structural parts of the embryo itself.
Therefore, the actual parts of the embryo are II, III, and IV.
Marking Scheme
- 1Identification of correct option (B) (1 mark)
Hint
Identify which terms represent the protective outer coverings (seed coats) of the seed, and exclude them from the parts of the embryo.
Quick Oral Answer
The actual parts of a seed embryo are the plumule, radicle, and cotyledons. Testa and tegmen are the outer and inner protective seed coats, not parts of the embryo.
Analysis & Explanation
In a dicot seed like gram, the seed coat consists of an outer tough layer called the testa and an inner thin layer called the tegmen. These coats enclose the embryo. The embryo itself consists of an embryonal axis (with the radicle at the lower end and the plumule at the upper end) and one or two cotyledons which store food for the germinating seedling. Since Testa (I) and Tegmen (V) are seed coats, they are excluded from the embryonic parts, making Option B the only correct choice.
Common Mistakes
- 1Confusing the seed coat layers (testa and tegmen) as parts of the embryo.
- 2Confusing radicle (future root) with plumule (future shoot).
Interesting Facts
The word 'radicle' comes from the Latin word 'radicula', meaning 'little root', while 'plumule' comes from 'plumula', meaning 'small feather', describing its delicate, leaf-like appearance.
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Frequently Asked Questions
How many marks does this question carry in CBSE Class 10 Science 2015?
This question carries 1 mark in the CBSE Class 10 Science 2015 examination.
Which chapter does this question come from in Science?
This question is from the chapter "How do Organisms Reproduce?" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Structure of a Seed" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2015 paper?
This is a MCQ question from Section B in the CBSE Class 10 Science 2015 paper.