Biology
Assertion (A): Vallisneria shows a special adaptation for hydrophilous pollination.
Reason (R): Its male flowers get detached from the plant and float freely until they reach and make physical contact with the female flowers at the water surface.
- 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.
Reproduction in Plants
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — A is true as Vallisneria shows a special adaptation for hydrophilous (water-mediated) pollination.
R is true as its male flowers get detached from the plant and float freely until they reach and make physical contact with the female flowers at the water surface.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
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Related Questions
Assertion (A): Calyx is the outermost whorl of a flower which consists of large, fragrant and brightly coloured petals.
Reason (R): As petals are brightly coloured and fragrant, they can be noticed by insects easily and help in cross pollination.
- 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): Micropropagation is the propagation or multiplication of plants by a special technique called 'tissue culture'.
Reason (R): It is called 'micropropagation' because this technique is applicable to micro-organisms only.
- 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.
Fill in the blanks by selecting suitable words: (unisexual, fertilisation, fruit, stamen, anther, bisexual, pollination, seed, ovary)
(a) A flower that bears both the male and the female parts is known as …………… flower.
(b) A flower bearing only male or female parts is known as …………… flower.
(c) Transfer of pollen grains from the anther to the stigma is known as ……………
(d) Fusion of male cell with female cell is called ……………
(e) The ovule develops into a ……………
(f) The ovary of the flower develops into a ……………
Name the flower part that:
(a) develops into a fruit
(b) develops into a seed
(c) produces pollen grains
(d) attracts insects for pollination
(e) connects stigma to the ovary