Biology
Assertion (A): Dicotyledonous seeds are always exalbuminous (non-endospermic).
Reason (R): All dicotyledonous seeds contain two cotyledons which store food material for the developing embryo.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Answer
A is false but R is true.
Reason — Both monocotyledonous and dicotyledonous seeds can be exalbuminous. Vallisneria and Orchids are examples of monocotyledonous exalbuminous seeds while gram and pea are examples of dicotyledonous exalbuminous seeds.
Dicotyledonous seeds contain two cotyledons storing food material.
Related Questions
With regard to germination in bean seed, answer the following questions:
- State the function of the 'micropyle'.
- Name the part of the seed that grows into the seedling.
- Name the part of the seed that provides nutrition for the growing seedling.
- Draw a neat labelled diagram of a mature bean seed.
Assertion (A): Fruit is the enlarged ripened ovule which protects the seeds.
Reason (R): Fruits develop from the ovary of the pistil after the process of pollination and fertilization. Ovarian wall forms the pericarp.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): Micropyle is the opening through which the pollen tube enters the ovule.
Reason (R): Micropyle helps in the diffusion of respiratory gases for the growing embryo.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): The single cotyledon of maize grain is termed as scutellum which does not store any food material for the developing embryo.
Reason (R): Food material for the developing embryo is stored in the endosperm of the maize grain.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.