Biology
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.
Answer
Both A and R are True.
Reason — The micropyle is a small opening in the ovule through which the pollen tube enters during fertilization. After fertilization, the micropyle remains as a tiny pore that allows the entry of water and oxygen, helping in the respiration of the growing embryo.
Related Questions
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): 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.
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.
Assertion (A): Epicotyl of the embryonic axis elongates faster in hypogeal germination.
Reason (R): Epicotyl of the embryonic axis elongates faster in epigeal germination and the cotyledons remain underground.
- 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.