Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The lactose present in the growth medium of bacteria is transported to the cell by the action of:
lac operon's $\beta$-galactoside permease (lacY) transports lactose into the cell.
Identify the type of flowers based on the position of calyx, corolla and androecium with respect to the ovary from the given figures (a) and (b). (Figure (a) shows floral parts arising below the ovary; figure (b) shows floral parts arising above the ovary.)
When the ovary is superior with other parts below — hypogynous; when ovary is inferior with parts above — epigynous.
Match List I with List II.
| List I | List II |
|---|---|
| A. Rhizopus | I. Mushroom |
| B. Ustilago | II. Smut fungus |
| C. Puccinia | III. Bread mould |
| D. Agaricus | IV. Rust fungus |
Choose the correct answer from the options given below:
Rhizopus — bread mould; Ustilago — smut; Puccinia — rust; Agaricus — mushroom.
The type of conservation in which the threatened species are taken out from their natural habitat and placed in special setting where they can be protected and given special care is called:
The standard term is ex-situ conservation; among the options given, the broader umbrella concept of "biodiversity conservation" is the closest fit.
Match List I with List II.
| List I | List II |
|---|---|
| A. Nucleolus | I. Site of formation of glycolipid |
| B. Centriole | II. Organization like the cartwheel |
| C. Leucoplasts | III. Site for active ribosomal RNA synthesis |
| D. Golgi apparatus | IV. For storing nutrients |
Choose the correct answer from the options given below:
Nucleolus → rRNA synthesis; Centriole → cartwheel; Leucoplasts → nutrient storage; Golgi → glycolipid formation.
The capacity to generate a whole plant from any cell of the plant is called:
Totipotency = ability of a single cell to develop into a complete organism.
Formation of interfascicular cambium from fully developed parenchyma cells is an example for:
Mature parenchyma regaining meristematic capacity → dedifferentiation.
Which one of the following can be explained on the basis of Mendel's Law of Dominance?
A. Out of one pair of factors one is dominant and the other is recessive.
B. Alleles do not show any expression and both the characters appear as such in $F_2$ generation.
C. Factors occur in pairs in normal diploid plants.
D. The discrete unit controlling a particular character is called factor.
E. The expression of only one of the parental characters is found in a monohybrid cross.
Choose the correct answer from the options given below:
B describes incomplete dominance/segregation outcome — not the law of dominance. The rest (A, C, D, E) are postulates of the Law of Dominance.
What is the fate of a piece of DNA carrying only gene of interest which is transferred into an alien organism?
A. The piece of DNA would be able to multiply itself independently in the progeny cells of the organism.
B. It may get integrated into the genome of the recipient.
C. It may multiply and be inherited along with the host DNA.
D. The alien piece of DNA is not an integral part of chromosome.
E. It shows ability to replicate.
Choose the correct answer from the options given below:
A naked piece of DNA without ori cannot replicate independently — it must integrate into the host genome (B) and be inherited with it (C).
Identify the part of the seed from the given figure which is destined to form root when the seed germinates. (Labels A, B, C, D mark four points on a dicot seed; D is at the lower tip — the radicle.)
The radicle (embryonic root, label D at the lower tip) develops into the primary root on germination.
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