NCERT 7th Class (CBSE) Science: Reproduction in Plants

Question: What are various methods of vegetative propagation?

Answer: There are two methods of vegetative propagation:

Natural Methods:

1. Vegetative Propagation by Roots – Example – Dalbergia sissoo (Shishan)
2. Vegetative Propagation by Stem – Example – Banana
3. Vegetative Propagation by Leaf – Example – Bryophyllum

Artificial Methods:

1. Cutting – Example – Sugarcane
2. Grafting – Example – Desi mango
3. Budding – Example – Rose
4. Layering – Example – Jasmine
5. Tissue Culture or Micro propagation – Example – Dahlia

Question: How is zygote formed in plants?

Answer: When male gamete present in pollen grain moves into ovules and fuse with female egg cell inside ovules and zygote is formed. This process is called fertilization.

Question:How does fertilization occur in flower?

Answer: After pollination pollen grain germinate on the stigma and moves through style to reach into ovules and fuse with female gamete. Thus fertilization occur.

Question: Where and how are seeds formed in plants?

Answer: In side ovary, the ovule develops into seed. As seed form, the ovary increases in size and became fruit.

Question: Name two kinds of gametes in flower?

Answer: Pollen grain and egg cell.

Question: What are pollen grains?

Answer: Male reproductive cell.

Question: What is found in embryo sac?

Answer: Female reproductive egg cell

Question: Name the plant form colonies by budding?

Answer: Duckweed or hydra

Question: Why are spore formed?

Answer: Spores are formed to help over coming unfavorable condition for reproduction.

Question: How is Bryophyllum plants propagated?

Answer: By leaves.

Question: How does spirogyra reproduce?

Answer: Fragmentation

Question: What is ‘scion’ ?

Answer: The portion of the plant which is grafted on other plant is called scion.

Question: What is ‘stock’ ?

Answer: The plant on which grafting is performed is called stock.