HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Important Questions for Biology

Gibberellins are synthesised from ______.

First natural cytokinin was obtained from ______.

Name the phytohormone related with the given phenomenon.

1. Apical dominance
2. Bolting of Cabbage 
3. Artificial ripening of fruit
4. Acts as Anti-transpirant by closing stomata

______ hormone is responsible for the efflux of K⁺ ions from guard cells and acts as an antitranspirant.

Which is the primary precursor of IAA in plants?

Name the cell which is responsible for nitrogen fixation in cyanobacteria.

Abscisic acid is the common name given to two identical substances isolated separately. Name them.

Give the chemical features of abscisic acid.

Which hormone is responsible for fruit ripening?

Abscission means ______.

Write two applications of Auxins.

What is nitrification?

Name any two nitrifying bacteria in soil.

What are long-day plants (LDP)? Give two examples.

Which of the following is the only gaseous plant growth regulator?

Complete the following box with reference to symptoms of mineral deficiency:

Give a reason – ABA is also known as an antitranspirant.

Explain the role of chlorophyllase enzyme in banana.

Name the hormone that is responsible for apical dominance.

A farmer wants to remove broad-leaved weeds from the jowar plantation in his field. Suggest any plant hormone to remove such weeds.