25 results found

Search Results for: cones

Petrified Wood : The World of Fossilized Wood, Cones, Ferns, and Cycads

Petrified Wood : The World of Fossilized Wood, Cones, Ferns, and Cycads ... Read More

Chlorophyll

Why are most plants green? Have you ever had the same question? Perhaps, you’ve been told that the plants are green... Read More

Vascular plants

Definition of Vascular plants The term 'vascular' is derived from the Latin word vāsculum, vās, meaning "a container and... Read More

Seed Plants

There are two main subdivisions of seed plants—the ones without covered seeds, the gymnosperms, and the ones with covered... Read More

Young-helmholtz theory of colour vision

'''Young-helmholtz theory of color vision A theory that there are three perceiving elements in the retina: red, green, and... Read More

Retina

retina light sensitive layer of the eye. In vertebrates, looking from outside, there are four major cell layers: (i) the... Read More

Axon

What Is Axon? An axon is a thin, long fiber of a nerve cell (or neuron). It transmits electrical impulses from the cell... Read More

Secondary succession

We all have come across news where forest lands got destroyed by wildfires. Or sometimes we have read about an entire... Read More

Human Perception – Neurology

A better understanding of human perception unlocks the key to how the mind works, an advantage when working with people with... Read More

Sensory Systems

A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal and... Read More

Angiosperm

Angiosperms Definition What is an angiosperm? An angiosperm is a plant that produces flowers. The angiosperms, also... Read More

Pollen Grain

What are Pollen Grains? Plants are unique structures and so they carry out mechanisms in special ways. Fertilization in... Read More

Gymnosperm

Definition noun, plural: gymnosperms A vascular plant in which the seeds are not enclosed by a ripened ovary... Read More

Vascular Plants: Ferns and Relatives

These plants are seedless plants, but unlike the bryophytes, they do have vascular tissue (xylem and phloem). Because of the... Read More

Leaves

Leaves are highly efficient solar energy converters. They capture light energy and through the process of photosynthesis.... Read More

Allogamy

Definition noun (botany) Cross-fertilization, where fertilization occurs when an ovum of a flower is fertilized by the... Read More

Cross-pollination

Definition noun (botany) A type of pollination in which the pollen from the anther of a flower is transferred to the stigma... Read More

Sense organ

Definition noun, plural: sense organs An organ or structure that has nerve endings capable of detecting and reacting to a... Read More

Self pollination

Definition noun (botany) A type of pollination in which the pollen from the anther of the flower is transferred to the... Read More

Rod

Rod 1. A straight and slender stick; a wand; hence, any slender bar, as of wood or metal (applied to various purposes).... Read More

Rhodopsin

rhodopsin (Science: protein) light sensitive pigment formed from retinal linked through a Schiff's base to opsin: rhodopsin... Read More

Photoreceptor

Photoreceptor (Science: cell biology) A specialised cell type in a multicellular organism that is sensitive to light. This... Read More

Sporophyte

Sporophyte Definition What is a sporophyte? Accordingly, the sporophyte is the plant generation that produces spores. To... Read More

Organ

Definition Of Organ An organ is a collection of tissues that carries out a function or set of related ones. An organ often... Read More

Blindness – Evolutionary regression? Maybe not!

The recent Netflix's hit flick, Bird Box, surely startled the viewers with the thrilling scenarios revolving around the... Read More