Biology
Assertion (A): All the flowers of angiospermic plants are complete or perfect.
Reason (R): Angiospermic flowers can be either unisexual or bisexual.
- 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.
Flower
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Answer
A is false but R is true.
Reason — Not all flowers of angiosperms are complete or perfect. A complete flower has all the four floral whorls — calyx, corolla, androecium and gynoecium. A perfect flower is bisexual, that is, it possesses both androecium and gynoecium. In angiosperms, some flowers are unisexual, such as those of papaya and maize, and therefore they are not perfect. Some flowers may also lack one or more whorls and are thus incomplete. Hence, Assertion (A) is false.
The Reason (R) is true because angiospermic flowers may be either unisexual or bisexual.
Therefore, A is false but R is true is the correct option.
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Related Questions
Draw a neat diagram of male (♂) and female (♀) reproductive organs of a flower.
(a) Label two important parts of the male reproductive organ.
(b) Label four important parts of the female reproductive organ.
(c) Write the collective name/whorl of each reproductive organ.
(d) Name the unicellular, sexual structures produced in each.
(e) Name the parts of the female reproductive organ that develop into a fruit and seed respectively.
Draw either an entire flower or a part of it showing the following conditions :
(a) Polysepalous calyx
(b) Gamosepalous calyx
(c) Polypetalous corolla
(d) Gamopetalous corolla
(e) Bracteate flower
Assertion (A): Dioecious plants bear unisexual flowers on different plants.
Reason (R): Dioecious plants bear staminate and pistillate flowers on the same plant at different locations.
- 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 kind of androecium in which the stamens are united in one group by their filaments is termed as Monadelphous.
Reason (R): Monadelphous stamens are found in Pea and Bombax flowers.
- 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.