List of top Biology Questions on Plant Growth and Development

What is the process of joining two stems to grow as a single plant ?
The hormone responsible for phototropism in plants is
Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their :
Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.
Derdrochronometer is used to measure/count
Synaptonemal Complex is formed
Vernalisation is
Which of these is incorrect for C4-plants?
Caryopsis is present in
Plants having little or no secondary growth are
Which one of the following generally acts as an antagonist to gibberellins?
Which one of the following growth regulators is known as ‘stress hormone’?
Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
How does pruning help in making the hedge dense ?
Parthenocarpic tomato fruits can be produced by:
Why is vivipary an undesirable character for annual crop plants?
Lichens are well known combination of an alga and a fungus where fungus has
Plants adapted to low light intensity have
Edible part of mango is :
The most abundant element present in the plant is
Edible part of mango is 
Differentiation of shoot is controlled by:
Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone:
Nicotiana sylvestris flowers only during long days and N. tabacum flowers only during short days. If raised in the laboratory under different photoperiods, they can be induced to flower at the same time and can be cross-fertilized to produce self-fertile offspring. What is the best reason for considering N. sylvestris and N. tabacum to be separate species:
What is true about T-lymphocytes in mammals: