10 Questions
Describe the basic structure of a bean seed.
A bean seed consists of a seed coat (testa and tegmen), cotyledons, hilum, and micropyle. Inside the seed coat, there are two thick cotyledons containing food for the embryo.
What is the function of the micropyle in a seed?
The micropyle serves two functions: absorbing water for germination and facilitating the diffusion of respiratory gases for the growing embryo.
How is the embryo of a bean seed structured?
The embryo of a bean seed consists of the radicle, which forms the root, and the plumule, which forms the shoot. The plumule includes a short stem with tiny leaves and a growing point.
Distinguish between albuminous and exalbuminous seeds based on endosperm presence.
Albuminous seeds have thin cotyledons with persistent endosperm, while exalbuminous seeds have thick, fleshy cotyledons that store food.
Explain the role of the seed coat in protecting the seed.
The seed coat, made of testa and tegmen, protects the inner parts of the seed from injury, bacteria, fungi, and insects. It acts as a barrier to external threats.
What is the primary function of a fruit?
The primary function of a fruit is to protect the seed and aid in seed dispersal.
How does a grain differ from a typical fruit?
In a grain, the fruit wall and the seed coat are fused together to form a protective layer.
What is the primary purpose of the seed coat?
The seed coat protects the embryo from mechanical damage.
What is the difference between monocotyledonous and dicotyledonous seeds?
Monocotyledonous seeds contain one cotyledon (seed-leaf), while dicotyledonous seeds contain two cotyledons.
What is the significance of the embryo remaining in a dormant state within the seed?
The embryo can withstand unfavorable conditions like temperature and drought while in a dormant state within the seed.
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