NEET Practice Questions (MCQs) with Answers & Solutions

The 'Bakane' disease, also known as foolish seedling disease, is caused by the fungi Gibberella fujikuroi. This disease leads to abnormal elongation of rice seedlings, which become thin and pale, often resulting in their death.

Hormones are secreted at the apex of the plant and they regulate the growth of another region. These plant hormones, also known as phytohormones, include auxins, gibberellins, cytokinins, ethylene, and abscisic acid, which play crucial roles in various growth processes.

ABA, or abscisic acid, is not related to the initiation of growth. Instead, it is known for its role in inhibiting growth and promoting dormancy in seeds and buds. The other options, such as Gibberellin, IAA (Indole-3-acetic acid), and Cytokinin, are all involved in promoting growth.

The growth inducer hormones include Indole Acetic Acid (IAA), Gibberellins, and Cytokinins. These hormones are responsible for promoting various aspects of plant growth and development. IAA (a type of auxin) promotes cell elongation, Gibberellins aid in stem elongation and seed germination, and Cytokinins promote cell division and delay senescence.

Cytokinins are plant hormones that promote cell division, which is essential for plant growth. Additionally, they play a role in delaying senescence (the aging process) in plant tissues, thus helping in the longevity of leaves and other organs.

The full form of 2,4-D is 2,4-dichlorophenoxyacetic acid. It is a synthetic auxin, which is commonly used as a herbicide to control weeds, particularly broadleaf weeds.

Gibberellins (GA) are plant hormones that play a key role in stimulating growth in the internode region. They promote cell elongation, division, and expansion, which leads to an increase in the length of the internodes.

The oat coleoptile test is conducted to study the effects of Indole Acetic Acid (IAA), which is a naturally occurring auxin in plants. This test helps in understanding the role of IAA in promoting cell elongation.

Gibberellins participate in multiple processes including removal of seed dormancy, developing seedless fruits, and growth of internodes. Therefore, the correct answer is 'All of the above'.

Tropic movements in plants are directional responses to environmental stimuli such as light, gravity, or water. These movements are unidirectional because they occur in response to the direction of the stimulus. For example, phototropism is the growth of a plant towards light, which is a unidirectional effect.