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During development of embryos in plants, PIN proteins are involved in (1) establishment of auxin gradients (2) regulation of gene expression (3) induction of programmed cell death (4) induction of […]

In mature Arabidopsis embryo, root apical meristem consists of cells derived from (1) embryo and apical suspensor cells (2) embryo only (3) suspensor only. (4) hypophysis only. Introduction The root […]

Distyly is A. presence of two styles in a flower B. presence of two lengths of styles in a species C. a form of dichogamy. D. a form of herkogamy. […]

23. Autogamy refers to (1) self-abortion of gametes (2) flower failing to open (3) self-pollination of flowers (4) cross-pollination of flowers   Introduction Autogamy is a fundamental reproductive mechanism in […]

In certain plants, the mechanism where timing of anther dehiscence and stigma receptivity do not coincide to avoid self-pollination is called (1) dichogamy (2) herkogamy (3) monoecy (4) Dioecy Introduction […]

21. Given below are statements regarding apomixis, i.e. asexual reproduction through seeds Sporophytic apomicts often produce a mix of clonal and sexual progeny B. In gametophytic apomixis, the unreduced central […]

20. Following are certain statements regarding apomixis in plants: A. Apomixis cannot be used to maintain hybrid vigor over many generations in plants. B. In sporophytic apomixis maternal genotype is […]

Match the two columns following asexual reproduction of plants and apomixes: (1) A – (i); B – (ii); C – (iii); D – (iv) (2) A – (ii); B – […]

During embryo germination in a grass family an absorptive organ that forms interface between the embryo and the starchy endosperm tissue is called (1) Coleorhiza (2) Coleoptile (3) Scutellum (4) […]

17. A few statements on early developmental stages in plants are given below: A. The cells of flower are diploid in nature. B. Only some specialized cells in reproductive organs […]