What is the Pollinating Agent for Water hyacinth and Water lily?

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Aquatic plants are mostly pollinated by water (hydrophilly). For example, in vallisneria, Hydrilla and Zostera water is the source for pollinating flowers. Vallisneria is a dioecious plant meaning both male and female plants are separate. The female flower reaches on the surface of water by the...
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Why Do Animals Hibernate?

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Hibernation is called “winter sleep” in which animals go into a state of inactivity due to cold environmental temperature, short day lengths and limitations of food. It is a survival strategy that animals adopt when the food availability is scarce or difficult to find during a chilly winter season. During hibernation, animals lower their metabolic processes; it allows animals to use body’s energy...
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What is Hole in the Heart?

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When you hear something like a baby has a hole in her heart -- what do you understand? Does it mean, the heart has a hole on its wall? Well, for a layman, such kind of presumption is obvious, but being a science student, you must know what it means.  Hole in a heart is associated...
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Digestive System Practice Questions

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Q1. A gap between teeth is called: a) Diastema b) Peristoma c) Dentosa d) Geostema Q2. Peristalsis occurs in: a) Stomach b) Esophagus c) Ileum d) Jejunum Q3. Gastro-esophageal sphincter is present between: a) Esophagus and stomach b) Stomach and duodenum c) Duodenum and pancreas d) between duodenum and jejunum Q4. Zymogen cells secrete: a) Mucus b) Pepsinogen c) Pepsin...
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What is Apomixis and Polyembryony?

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In a normal sexual cycle (amphimixis), the megaspore mother cell (2n) of ovule is converted to haploid gametophytic cells (embryo sac) through meiosis (reductional division). This results in the formation of an egg cell, synergids, antipodal cells and polar nuclei cell. Egg fertilizes with the male...
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THE LIVING WORLD

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 Characteristics of Living Organisms: 1. Cellular Structure 2. Metabolism 3. Growth 4. Reproduction 5. Consciousness Other characteristics of living beings include: - Adaptation - Lifespan - Homeostasis - Healing and repair - Movement and variation Q. What is a defining feature? A. A feature...
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