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Plant Growth and Development

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Distinguish between short day plants and long day plants.

Short day plants :

1. These are plants which require less exposure to light for a period less than the critical duration.

2. If night is interrupted by light then there is no flowering.

3. These need light of short wave lengths whose value is below critical point.

4. These produce flowering in winter.

7. If days are interrupted by darkness then no effect.

Long day plants :

1. These are plants which require the exposure to light for a period exceeding a well defined critical duration.

2. If night is interrupted by light then no such effect on flowering.

3. These need light whose value is above critical point.

5. These produce flowers in summer.

6. If days are interrupted by darkness then no flowers.

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Give the types of auxins.

Auxins are of two types :

(1) Natural auxins : These are naturally occuring auxins, isolated from plants and are regarded as phytohormones e.g. IAA. NAA etc.

(2) Synthetic auxins : These are synthesized by artificially e.g. IBA 2,4-D etc.

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Who coined the term gibberellin ?

Yabuta.
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Term kinetinwas coined by whom ?

Skoog and Miller.
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What is C/N ratio ?

C/N ratio is the ratio of carbohydrates and nitrogenous compounds which regulate the growth in plants.
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Who isolated auxin and from where ?

Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.

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