Viva Voce: Dicot Seed | Lab Manuals for Class 10 PDF Download

Q.1. Name of opening present in a seed through which seed absorbs water at the time of seed germination.

The micropyle is a small opening of a seed through which water take entry into the seed at the time of seed germination.

Q.2. Suggest a reason for overnight soaking of the seeds before the start of the experiment.

During soaking, the cotyledons absorb water from the container and becomes actively germinating.

Q.3. An embryo contains a plumule and a radicle. What does these develop into?

The plumule develops into the shoots and new roots develops from the radicle initiating the formation of a new plant.

Q.4. Give examples of two common seeds and their uses.

• Mustard seeds are used for making oil.
• Cotton seeds are used as cattle feed and for production of fertilisers.

Q.5. We split open the seed of gram when chana dal is made out of it. Write the fate of embryo, while performing the process of dal making out of gram seed.

The chana dal is the broken seed of gram. They show the cotyledonous part. While making dal, the embryo gets destroyed and is unable to germinate.

Q.6. What are different parts of tigellum?

It is the central part of the seed, to which two cotyledons get attached. The upper part of it is called plumule and the lower end is called radicle.

Q.7. How many seed coats are generally present in a seed?

Generally two seed coats are present in a seed, i.e. the outer one is testa anpl the inner one is tegmen.

Q.8. Clarify the meaning of a non-endospermic seed.

Some seeds have special food laiden tissue in them called, endosperm. The seeds which do not possess them are called non-endospermic seeds.

Q.9. Seed is a miniature plant. Comment.

Seed is mature ovule, a unit containing an embryo plant, in which the primordia of future structure are already established and which is embedded with nutrients, all within a protective seed coat.

Q.10. In a germinating seed, the radicle emerges before the plumule, why?

The radicle emerges before the plumule because it needs to penetrate into the soil to facilitate water absoption for the growing embryo.

Q.11. A seed is covered by a hard coat on its outside surface, what purpose is served by this seed coat?

• Protection of embryo present inside the seed.
• Prevent any type of physical harm.
• Dehydration of embryo is prevented by the seed coat.

Q.12. Do you consider seed dead or alive? Explain.

Freshly harvested seeds are alive. They respire, but do not show immediate growth because their metabolic activities get arrested for time being. They become active, when put for germination.

Q.13. Describe tigellum.

It is the part of the embryonal axis which holds the cotyledons in such a way that these (cotyledons) open like a book.

Q.14. Name few non-endospermic seeds.

Non-endospermic seeds are Orchid, gram, rajma, pea, etc.