STD 11 - 3. Plant kingdom — NEET STD 11 Science — Question

Fibres associated with phloem are...... .fibres.

Assertion: Fascicular vascular cambium, interfascicular cambium and cork cambium are examples of secondary meristem.
Reason: The meristem that occurs in the mature regions of roots and shoots of many plants, particularly those that produce woody axis and appear later than primary meristem is called the secondary meristem.

Statement I: Apocarpous condition is present in lotus and rose.
Statement II: When stamens are attached to the perianth, they are epiphyllous.

Which of the following is true for crossing over ?
(i) Crossing over is the exchange of genetic material between two homologous chromatids.
(ii) Crossing over is also an enzyme-mediated process and the enzyme involved is called recombinase.
(iii) Crossing over leads to recombination of genetic material on the two chromosomes.
(iv) Recombination between homologous chromosomes is completed by the end of diplotene.
(v) Crossing over started in pachytene.
(vi) It is responsible for variation in organism.

Which one of the following structures between two adjacent cells is an effective transport pathway?

The prothallus represents

The branch, which is associated with diagnosis, prevention and cure of mental disorders is called