Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Large, colourful, fragrant flowers with nectar are seen in:
Entomophilous (insect-pollinated) flowers are large, brightly coloured and fragrant.
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
Recombination nodules appear in Pachytene (crossing over occurs here).
Among 'The Evil Quartet', which one is considered the most important cause driving extinction of species?
Habitat loss & fragmentation is the leading cause (NCERT, Evil Quartet).
Identify the correct statements:
A. Lenticels are the lens-shaped openings permitting the exchange of gases. B. Bark formed early in the season is called hard bark. C. Bark is a technical term that refers to all tissues exterior to vascular cambium. D. Bark refers to periderm and secondary phloem. E. Phellogen is single-layered in thickness.
A and D correct. B wrong (early-season bark is SOFT). C wrong (bark is NON-technical per NCERT). E wrong (phellogen is a couple of layers thick).
Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of:
Malonate is a classic competitive inhibitor of succinic dehydrogenase (TCA cycle).
Match List I with List II:
| List I | List II |
|---|---|
| A. Cohesion | I. More attraction in liquid phase |
| B. Adhesion | II. Mutual attraction among water molecules |
| C. Surface tension | III. Water loss in liquid phase |
| D. Guttation | IV. Attraction towards polar surfaces |
A-II (cohesion = mutual attraction); B-IV (adhesion to polar); C-I; D-III (guttation = liquid water loss).
Match List I with List II:
| List I | List II |
|---|---|
| A. Iron | I. Synthesis of auxin |
| B. Zinc | II. Component of nitrate reductase |
| C. Boron | III. Activator of catalase |
| D. Molybdenum | IV. Cell elongation and differentiation |
Iron → catalase; Zinc → auxin; Boron → cell elongation; Mo → nitrate reductase.
Which of the following statements are correct about Klinefelter's Syndrome?
A. This disorder was first described by Langdon Down (1866). B. Such an individual has overall masculine development. However, the feminine development is also expressed. C. The affected individual is short statured. D. Physical, psychomotor and mental development is retarded. E. Such individuals are sterile.
B and E correct. A wrong (Klinefelter described in 1942 by H. Klinefelter; Langdon Down → Down's syndrome). C wrong (Klinefelter individuals are typically tall, not short). D wrong (no severe mental retardation).
Which of the following combinations is required for chemiosmosis?
Chemiosmosis needs a membrane, proton pump, proton gradient and ATP synthase.
How many different proteins does the ribosome consist of?
Eukaryotic 80S ribosome contains approximately 80 distinct proteins (NCERT figure).
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.