Biology
Assertion (A): Pteridophytes bear well-formed leaves, stems, roots but do not produce flowers and seeds for reproduction.
Reason (R): These plants bear small rounded bodies on the undersurface of their leaves. These bodies contain tiny spores which get scattered to produce new plants.
- 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
Both A and R are true and R is the correct explanation of A.
Reason — A is true as Pteridophyta are vascular plants with well-developed roots, stems, and leaves. They do not produce flowers or seeds; instead, they reproduce by spores.
R is true as many pteridophytes (like ferns) produce sporangia in clusters called sori on the undersides of leaves. These sporangia contain spores that are released and grow into new plants.
Reproduction happens via spores in sori (not flowers or seeds).
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
Related Questions
Assertion (A): Monerans are unicellular, primitive organisms which contain an unorganised nucleus, called as nucleoid.
Reason (R): Nucleoid is the nuclear material which is enclosed in a gelatinous capsule instead of a nuclear membrane.
- 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 locomotory structure of all protists is a pseudopodium which is formed temporarily by the organisms towards the direction of their movement.
Reason (R): Most of the protists are aquatic and they move with the help of water current. They may have cilia or flagella for their locomotion.
- 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): Most gymnosperms are evergreen and grow in mountain areas.
Reason (R): Mountainous areas have high wind velocity and heavy rainfall. So, gymnosperms shed their leaves periodically, but not all at once.
- 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): Monocotyledonous plants bear only one cotyledon in their seeds.
Reason (R): Monocot plants usually have long, narrow leaves with parallel veins.
- 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.