Last updated on March 22nd, 2023 at 12:53 pm
Differences between self-pollination and cross-pollination:
If the pollen lands on the stigma of the same flower or another flower of the same plant, it is called self-pollination.
When the pollen of a flower lands on the stigma of a flower of a different plant of the same kind, it is called cross-pollination
Q6 : How does the process of fertilizations take place in flowers?
The cell that results from the fusion of two gametes is called a zygote. The process of fusion of male and female gametes is called fertilisation The zygote develops into an embryo.
After fertilisation, the ovary grows into a fruit and other parts of the flower fall off. The fruit is the ripened ovary. The seeds develop from the ovules. The seed contains an embryo enclosed in a protective seed coat.
Q7 : Describe the various ways by which seeds are dispersed.
Below are the methods by which seeds are dispersed.
Dispersal by animals – Seeds can be dispersed in many ways by birds and animals.
Animals and birds can consume fruits and excrete seeds from the parent plant.
Dispersal by wind – Seeds that get dispersed by wind are usually of a smaller size, or they have wings or hairs that support their mobility. For example, winged seeds of drumsticks, sunflower.
Dispersal by water – A lot of aquatic plants or plants that live near water have seeds that can float and are carried away by the water. For example, coconuts
Dispersion by explosion– Some seeds are dispersed by cracking or breaking, Fruits that jerk suddenly. Seeds are scattered or dispersed far away from the mother plant. Examples – castor
Q8 : Match items in Column I with those in Column II:
|Column I||Column II|
|(a) Bud||(i) Maple|
|(b) Eyes||(ii) Spirogyra|
|(c) Fragmentation||(iii) Yeast|
|(d) Wings||(iv) Bread mould|
|(e) Spores||(v) Potato|
Q9 : Tick ( Å¡ ) the correct answer:
(a) The reproductive part of a plant is the
(b) The process of fusion of the male and female gametes is called
- seed formation
(c) Mature ovary forms the
(d) A spore producing plant is
- bread mould
(e) Bryophyllum can reproduce by its
Also Read –
- Class 7 Science Chapter 11 Transportation in Animals And Plants
- Class 7 Science Chapter 10 Respiration in Organisms
- Class 7 Science Chapter 9 Soil
- Class 7 Science Chapter 8 Winds Storms and Cyclones.