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If cells obtain ability of cell division in certain circumstances, it is called .........
De-differentiation is the process by which cells that have specialized (differentiated) regain the ability to divide. This can occur under certain circumstances, such as when plants need to heal wounds or regenerate tissues.
Motor cells of leaves and grass, shows which type of movement ? (AIIMS-1996
Which activity in plant is observed due to ethylene ?
Ethylene is a plant hormone that plays a crucial role in the ripening and maturation of fruits. It triggers a series of physiological changes that lead to the softening, sweetening, and color change of fruits.
Which of the following type is improper for nastism ?
Nastic movements (nastism) are non-directional responses to stimuli (e.g., photonasty, hydronasty, and thermonasty). In contrast, tropisms are directional growth responses to stimuli. Phototropism is a type of tropism, not nastism.
Which of the following is incorrect for tropism?
Thigmotaxis refers to movement or orientation of an organism in response to touch or physical contact, typically seen in animals. Tropism refers to directional growth in response to a stimulus, which applies to plants (e.g., phototropism, thermotropism, hydrotropism). Hence, thigmotaxis is incorrect for tropism.
What is the direction of tropism ?
Tropism is the directional growth of an organism in response to an external stimulus. The direction of the growth is determined by the direction of the stimulus, making it 'directional'.
Which of the example is improper for tropic movement ?
Mimosa (also known as Touch-me-not plant) exhibits nastic movements, which are non-directional responses to stimuli (such as touch), not tropic movements. Tropic movements are directional growth movements determined by the direction of the stimulus.
Match the list : Column I (P) Volvox (Q) Mimosa (R) Antherozoids of bryophytes (S) Leaf tendril Column II (i) Chemotaxis (ii) Phototaxis (iii) Movement / tropism (iv) Thigmotropism
The correct matching is: (P-ii) Volvox exhibits phototaxis, (Q-iv) Mimosa exhibits thigmotropism (response to touch), (R-i) Antherozoids of bryophytes exhibit chemotaxis, and (S-iii) Leaf tendril exhibits movement/tropism.
Match the list : Column I (P) Plasmodiumof slime mould (Q) Chlamydomonas algae (R) protoplasmof tradenschantia leaf (S) Protoplasmof hydrilla Column II (i) Ciliarymovement (ii) Circular movement (iii) Rotationalmovement (iv) Amoeboid movement leaves
The correct matching is: (P-iv) Plasmodium of slime mould exhibits amoeboid movement, (Q-i) Chlamydomonas algae exhibit ciliary movement, (R-ii) protoplasm of tradenschantia leaf exhibits circular movement, and (S-iii) protoplasm of hydrilla exhibits rotational movement.
Match the following : Column I
(P) Opening of leaf blade
(Q) Closing of leaves
(R) Zigzag movement in apical bud
(S) Spiraland helical growth of tendrilar plants
(T) Pulsation in leaflets of indian telegraph plant
Column II
(i) Epinasty
(ii) Hyponasty
(iii) Nutation
(iv) Circumnutation
(v) Variation
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.