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

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.

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  1. How is sexual reproduction different from asexual reproduction?

    • In sexual reproduction two parent is present one male and one female .The offspring are not exact copies of either parent.

      In asexual reproduction only one parent is present .The resulting offspring are exact copies of the parent.

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