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.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.
Answer
A is False and 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
Seeds germinate in two ways. The type in which the cotyledons remain underground is called (P) …………… germination. During this type of germination, the (Q) …………… elongates faster.
- P — Epigeal, Q — Hypocotyl
- P — Epigeal, Q — Epicotyl
- P — Hypogeal, Q — Epicotyl
- P — Hypogeal, Q — Hypocotyl
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.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.
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.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.
Assertion (A): The single cotyledon of maize grain is termed as hilum which does not store any food material for the developing embryo.
Reason (R) Hilum is located in the embryonic region of the maize grain.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.