Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Heterophylly in plants, such as the different leaf shapes in juvenile vs. mature plants, or in air vs. water, is an example of:
The text explicitly states: 'This phenomenon of heterophylly is an example of plasticity.' And also, 'Plant exhibit plasticity in development.'
Why is it stated that 'differentiation in plants is open'?
The context from page 172 clearly states: 'Now, we may say that even differentiation in plants is open, because cells/tissues arising out of the same meristem have different structures at maturity.'
In the process of forming a tracheary element, cells undergo specific structural changes. Which of the following is a key change during this differentiation?
The text on page 172 states: 'For example, to form a tracheary element, the cells would lose their protoplasm. They also develop a very strong, elastic, lignocellulosic secondary cell walls, to carry water to long distances even under extreme tension.'
Consider the phrase 'A differentiated cell may dedifferentiate and then redifferentiate.' This statement highlights which characteristic of plant development?
On page 173, it is stated: 'A differentiated cell may dedifferentiate and then redifferentiate. Since differentiation in plants is open, the development could also be flexible, i.e., the development is the sum of growth and differentiation. Plant exhibit plasticity in development.' This directly links the ability to dedifferentiate and redifferentiate to the flexibility/plasticity of plant development.
What term correctly describes the parenchyma cells that are made to divide under controlled laboratory conditions during plant tissue culture?
The prompt asks: 'What would you call the parenchyma cells that are made to divide under controlled laboratory conditions during plant tissue culture?' These cells are originally differentiated parenchyma cells, and when they are induced to divide, they are undergoing dedifferentiation, regaining their cell division capacity. The product of this process, if it forms an undifferentiated mass, is often called callus, which is composed of dedifferentiated cells.
Which of the following describes the vascular bundles in a monocotyledonous root?
The context states: 'When xylem and phloem within a vascular bundle are arranged in an alternate manner along the different radii, the arrangement is called radial such as in roots.' It also notes for monocotyledons, 'the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.' Combining these, monocot roots have radial and closed vascular bundles.
Regarding the pith in monocotyledonous roots, which statement is correct?
According to the NCERT text, 'Pith is large and well developed' in monocotyledonous roots, in contrast to dicot roots where the pith is 'small or inconspicuous.'
What is a distinguishing characteristic of the number of xylem bundles in a monocot root as compared to a dicot root?
The text explicitly states: 'As compared to the dicot root which have fewer xylem bundles, there are usually more than six (polyarch) xylem bundles in the monocot root.'
Which of the following structures is absent in the vascular bundles of monocotyledonous roots, preventing secondary growth?
The text states: 'In the monocotyledons, the vascular bundles have no cambium present in them. Hence, since they do not form secondary tissues they are referred to as closed.'
The tissue organization of a monocotyledonous root includes which of the following components?
The NCERT text details the anatomy of the monocot root: 'It has epidermis, cortex, endodermis, pericycle, vascular bundles and pith.' It further specifies 'Pith is large and well developed.'
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.