Science (English Medium) Class 11 - CBSE Question Bank Solutions

Plant growth substances (PGS) have innumerable practical applications. Name the PGS you should use to

Inhibit seed germination

Gibberellins promote the formation of ______ flowers on genetically _____ plants in Cannabis whereas ethylene promotes formation of _______ flowers on genetically ______ plants.

In botanical gardens and tea gardens, gardeners trim the plants regularly so that they remain bushy. Does this practice have any scientific explanation?

Auxins are growth hormones capable of promoting cell elongation. They have been used in horticulture to promote growth, flowering and rooting. Explain the meaning of the following terms related to auxins.

Auxin precursors

Auxins are growth hormones capable of promoting cell elongation. They have been used in horticulture to promote growth, flowering and rooting. Explain the meaning of the following terms related to auxins.

Anti-auxins

Auxins are growth hormones capable of promoting cell elongation. They have been used in horticulture to promote growth, flowering and rooting. Explain the meaning of the following terms related to auxins.

Synthetic auxins

While experimentation, why do you think it is difficult to assign any affect seen to any single hormone?

What is the mechanism underlying the phenomenon by which the terminal/apical bud suppresses the growth of lateral buds? Suggest measures to overcome this phenomenon.

To get a carpet like grass lawns are mowed regularly. Is there any scientific explanation for this?

Define parthenocarpy. Name the plant hormone used to induce parthenocarpy.

A gardener finds some broad-leaved dicot weeds growing in his lawns. What can be done to get rid of the weeds efficiently?

On germination a seed first produces shoot with leaves, flowers appear later, Why do you think this happens?

Fill in the blanks:

Apical dominance is due to ______.

Fill in the blanks:

______ hormone initiate rooting.

Name a hormone which is gaseous in nature

Name a hormone which induces femaleness in flowers of cucumber

Name a hormone which is used for killing weeds (dicots)

Name a hormone which induces flowering in long day plants

Which of the following is removed from our body by lungs?

What is the stomatal apparatus?