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NEET Practice Questions (MCQs) with Answers & Solutions

Practice free NEET NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

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In epigynous flowers, where do the other floral parts arise in relation to the ovary?

A. Below the ovary with the ovary being superior B. At the same level as the ovary with the ovary being half inferior C. Above the ovary with the ovary being inferior D. Fused with the base of the ovary, with the ovary being superior

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Explanation

The NCERT text states: 'In epigynous flowers, the margin of thalamus grows upward enclosing the ovary completely and getting fused with it, the other parts of flower arise above the ovary. Hence, the ovary is said to be inferior as in flowers of guava and cucumber...'

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Which plant family, known for its economic importance in food and medicine, is characterized by bicarpellary, syncarpous gynoecium with a superior ovary and axile placentation?

A. Fabaceae B. Solanaceae C. Liliaceae D. Brassicaceae

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Explanation

The NCERT chapter 'MORPHOLOGY OF FLOWERING PLANTS' describes floral characters for Solanaceae as: 'Gynoecium: bicarpellary obligately placed, syncarpous; ovary superior, bilocular, placenta swollen with many ovules, axile'. It also lists examples like tomato, brinjal, potato, belladonna, etc., which are sources of food and medicine.

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What term describes the condition where calyx and corolla are not distinct, as observed in lily?

A. Perianth B. Bracteate C. Gamopetalous D. Polysepalous

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Explanation

The NCERT text states: 'In some flowers like lily, the calyx and corolla are not distinct and are termed as perianth.'

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The development of floral primordium in a plant is initiated by:

A. Increase in nutrient uptake only B. Structural changes and environmental signals C. Hormonal and structural changes D. Accumulation of photoperiodic pigments

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Explanation

The NCERT text mentions: 'Much before the actual flower is seen on a plant, the decision that the plant is going to flower has taken place. Several hormonal and structural changes are initiated which lead to the differentiation and further development of the floral primordium.'

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What happens to the ovary and ovules after fertilization in flowering plants?

A. Both ovary and ovules develop into seeds. B. The ovary develops into a fruit, and the ovules develop into seeds. C. The ovary develops into a seed, and the ovules develop into a fruit. D. Both ovary and ovules degenerate.

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Explanation

The NCERT text states: 'After fertilisation, the ovary is modified into fruits and ovules into seeds.'

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Which of the following is an example of a flower with 'free central' placentation?

A. Mustard B. Pea C. Dianthus D. China rose

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Explanation

The NCERT text states: 'When the ovules are borne on central axis and septa are absent, as in Dianthus and Primrose the placentation is called free central.'

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For a rigid body rotating about a fixed axis, which of the following statements is true regarding the angular velocity?

A. It is a scalar quantity and its magnitude is $d\theta/dt$. B. It is a vector quantity, and its direction is always perpendicular to the axis of rotation. C. It is a vector quantity, and its direction lies along the axis of rotation. D. It is a scalar quantity, but its direction changes with the sense of rotation.

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Explanation

According to the NCERT text, 'In our discussion so far the angular velocity appears to be a scalar. In fact, it is a vector... For rotation about a fixed axis, the angular velocity vector lies along the axis of rotation...'. Therefore, option 3 is correct.

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The linear velocity (v) of a particle of a rigid body rotating about a fixed axis is related to its angular velocity ($\omega$) and position vector (r) by which of the following expressions?

A. $\mathbf{v} = \mathbf{\omega} + \mathbf{r}$ B. $\mathbf{v} = \mathbf{\omega} \cdot \mathbf{r}$ C. $\mathbf{v} = \mathbf{\omega} \times \mathbf{r}$ D. $\mathbf{v} = |\mathbf{\omega}| |\mathbf{r}| \cos\theta$

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Explanation

The NCERT text states, 'The linear velocity of the particle at P is $\mathbf{v} = \mathbf{\omega} \times \mathbf{r}$.' This vector product correctly represents the relationship between linear and angular velocity.

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In the rotation of a rigid body about a fixed axis, every particle of the body moves in a circle. What is the orientation of this circle relative to the axis of rotation?

A. The plane of the circle is parallel to the axis. B. The plane of the circle is perpendicular to the axis. C. The plane of the circle contains the axis. D. The plane of the circle makes an angle of $45^{\circ}$ with the axis.

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Explanation

The NCERT text mentions, 'every particle of the body moves in a circle, which lies in a plane perpendicular to the axis and has its centre on the axis.' This directly answers the question.

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For a rigid body rotating about a fixed axis, if the origin is chosen on the axis of rotation, and 'r' is the position vector of a particle P, then where is the center of the circular path of particle P?

A. At the origin. B. At the tip of the position vector 'r'. C. Perpendicular to the position vector 'r' but on the axis. D. On the axis of rotation.

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Explanation

The NCERT text states, 'every particle of the body moves in a circle, which lies in a plane perpendicular to the axis and has its centre on the axis.' Since the origin is chosen on the axis, the center of the circle must also be on the axis.

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