Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Spindle fibers attach to kinetochores of chromosomes during
Spindle attachment to kinetochores and alignment at the metaphase plate occur during metaphase.
In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?
A test cross is performed with the homozygous recessive parent (bb) to deduce the unknown genotype.
The equation of Verhulst-Pearl logistic growth is $\dfrac{dN}{dt} = rN\left[\dfrac{K-N}{K}\right]$. From this equation, $K$ indicates:
$K$ is the carrying capacity; $r$ is the intrinsic rate of natural increase.
How many molecules of ATP and NADPH are required for every molecule of $CO_2$ fixed in the Calvin cycle?
Standard NCERT: 3 ATP + 2 NADPH per CO₂ fixed.
Match List I with List II.
| List I | List II |
|---|---|
| A. Clostridium butylicum | I. Ethanol |
| B. Saccharomyces cerevisiae | II. Streptokinase |
| C. Trichoderma polysporum | III. Butyric acid |
| D. Streptococcus sp. | IV. Cyclosporin-A |
Choose the correct answer from the options given below:
Clostridium → butyric acid; Saccharomyces → ethanol; Trichoderma → cyclosporin-A; Streptococcus → streptokinase.
These are regarded as major causes of biodiversity loss:
A. Over exploitation B. Co-extinction C. Mutation D. Habitat loss and fragmentation E. Migration
Choose the correct option:
The "evil quartet" is habitat loss, over-exploitation, alien invasion and co-extinctions. Of those listed, A, B and D are valid causes.
Given below are two statements:
Statement I: Chromosomes become gradually visible under light microscope during leptotene stage.
Statement II: The beginning of diplotene stage is recognized by dissolution of synaptonemal complex.
In the light of the above statements, choose the correct answer from the options given below:
Both are standard descriptions of meiotic prophase-I sub-stages.
Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin
2,4-D selectively kills dicot weeds; mature monocots (grasses) are unaffected.
A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected to occur in the progeny?
Incomplete dominance: $Rr \times RR \to \tfrac12 RR$ (red) $+ \tfrac12 Rr$ (pink).
Which of the following are required for the dark reaction of photosynthesis?
A. Light B. Chlorophyll C. $CO_2$ D. ATP E. NADPH
Choose the correct answer from the options given below:
Calvin (dark) reactions need CO₂, ATP and NADPH — not light or chlorophyll directly.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.