Biology
Assertion (A): Vallisneria is a good example of wind-pollinated flower, even though the plant is aquatic.
Reason (R): Both male and female flowers of Vallisneria float on the surface of water and get pollinated with the help of wind.
- Both A and R are true.
- Both A and R are false.
- A is true and R is false.
- A is false and R is true.
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.
- Both A and R are false.
- A is true and R is false.
- A is false and 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.
- Both A and R are false.
- A is true and R is false.
- A is false and 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