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An evect unique to acgionperms, is. (t) Seed tomasion

An evect unique to acgionperms, is. (t) Seed tomasion

  1. A Aemstion of generation
  2. Doctic lerileation
  3. Anisogamy
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22 Pre-Medical : Biology AMABH TRANSPORT IN PLANTS INTRODUCTION In a flowering plant substances that would need to be transported are water, mineral nutrients, organic nutrients and plant growth regulators / hormones. The small distance transport means transport Wth in the cell or across the membrans or from cell to cell in a tisse occurs by diffusion, facilitated diffusion (passive transport) and by Active transport. Transport owe longer distance procceds through the vascular system (the xylem and the phloem) and is called translocation. DIRECTION OF TRANSPORT (i) In rooted plants transpont in xylem (of water and minerals) is unidirectional, from roots to stem. (ii) Organic and mineral nutrients however, undergo multidirectional transport. Organic compounds symthesised in the photosynthetic leaves are exported to all other parts of the plant including storage organs. From the stornge organs they are late re-exported. The mineral nutrients are taken up by the roots and transported upwards into the stem. leawes and the growing regions. When any plant part undergoes senescence, nutrients may be withdrawn from such regions and moved to the growing parts. (iii) Hormones or plant growth regulators and other chemical stimuli are alse transported, though in very small amounts, sometimes in a strictly polarised or unidirectional manner from where they are synthesised to other parts. Hence, in a flowering plant there is a complex tralfic of compounds (but probably wery orderly) mosing in different directions, eoch organ recelving some substances and giving out some others. Means or types of transport - Transport in plants is of two types - (A) Short distance transport (B) Long distance transport (A) Short distance transport : - If transport occurs within the cell or from one cell to another cell then it is considered as short distance transport. Further it is of two types - (1) Passive transport (2) Active transport (1) Passive transport - - II transport occurs according to concentration gradient (High concentration to low concentration) without expenditure of ATP It occurs by following methods- (i) Simple diffusion (ii) Facilitated diffusion SIMPIE DIFFUSION - "The movement of molecules or atoms or ions of a material from an area of higher concentration to an area of their lower concentration is called diffusion." Eg Diffusion of odour of perfume, spreading of crystals of in water. The diffusion is continued till the dynamic equilibrium is not established. At this stage the movement of molecules is equal in both the direction, so net movement is zero. Diffsion is a slow process it can account for only short distance of molecule for Eg. for movement of a molecule across a typical plant cell (about ) takes approximately second.
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Question Text
An evect unique to acgionperms, is. (t) Seed tomasion
TopicPlant Physiology
SubjectBiology
ClassClass 11