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Botany MCQs for NEET — Practice Questions with Answers

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IPM stands for

A. Integrated Pest Management B. Integrated Part Messenger C. International Pollution Management D. Inter- Pesticide Management Committee

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Explanation

NCERT page number 187

10.5 Microbes As Biocontrol Agents

Microbes In Human Welfare

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Which of the following is free living nitrogen fixer?

A. Baculoviruses B. Azotobacter C. Rhizobium D. Trichoderma

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Explanation

NCERT page number 188

10.6 Microbes As Biofertiliser

Microbes In Human Welfare

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Mycorrhizae is

A. Symbiotic association of lichen with algae B. Symbiotic association of fungi with higher plants C. Symbiotic association of bacteria with plants D. Symbiotic association of algae with fungi

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Explanation

NCERT page number 188

10.6 Microbes As Biofertiliser

Microbes In Human Welfare

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Which of the following is not cynobacteria?

A. Anabaena B. Nostoc C. Oscillatoria D. Glomus

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Explanation

NCERT page number 188

10.6 Microbes As Biofertiliser

Microbes In Human Welfare

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In paddy fields, which of the following serve as an important Biofertiliser?

A. Bacteria B. Cyanobacteria C. Fungi D. Yeast

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Explanation

NCERT page number 188

10.6 Microbes As Biofertiliser

Microbes In Human Welfare

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Which of the following cannot be detected in a developing foetus by amniocentesis?

Klinefelter's syndrome

Sex of the foetus

Down's syndrome

Jaundice

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Explanation

(d) Amniocentesis is a foetal sex determination test based on the chromosomal pattern in the amniotic fluid surrounding the developing embryo. Jaundice is acondition not based on chromosomal pattern. It is a disease related to dysfunctions.

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What is amniocentesis?

I. A pre-natal, foetal determination test.

II. A post-natal foetal determination test

III. It is based on the chromosomal pattern of the amniotic fluid.

IV. It is based on the chromosomal pattern of the chorionic fluid.

V. It is based on the chromosomal pattern of the amniotic fluid and the seminal fluid

II, III

I, V

I, III

I, V

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Explanation

Amniocentesis is a pre-natal foetal sex determination test based on the chromosomal pattern in the amniotic fluid surrounding the developing embryo. It is currently ban in India due to increasing female foeticide. (page- 58)

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Which of the following describes arithmetic growth in plants?

A. Both daughter cells produced from a mitotic division continue to divide, leading to an exponential increase in biomass. B. sigmoid curve is obtained when plotting growth against time, characteristic of cultures with limiting factors. C. Following mitotic cell division, only one daughter cell continues to divide, while the other differentiates and matures. D. The initial growth is slow (lag phase), followed by a rapid increase at an exponential rate (log phase).

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Explanation

According to the NCERT text, 'In arithmetic growth, following mitotic cell division, only one daughter cell continues to divide while the other differentiates and matures.'

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The mathematical expression for arithmetic growth is given by $L_t = L_0 + rt$. What does '$r$' represent in this equation?

A. The final length at time 't'. B. The initial length at time 'zero'. C. The growth rate or elongation per unit time. D. The base of natural logarithms.

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Explanation

The NCERT text explicitly states, '$r$ = growth rate / elongation per unit time' for the arithmetic growth equation.

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Which of the following scenarios is NOT characteristic of geometric growth?

A. Both progeny cells following mitotic cell division retain the ability to divide. B. Plotting the growth parameter against time yields a typical sigmoid or S-curve. C. root elongating at a constant rate. D. The initial growth being slow (lag phase) followed by an exponential phase.

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Explanation

The NCERT text states that 'The simplest expression of arithmetic growth is exemplified by a root elongating at a constant rate.' Geometric growth, in contrast, involves both progeny cells dividing and typically follows a sigmoid curve.

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