Describe The Head Of A Cockroach.
The head which is normally held at right angles to the long axis of the body is pear-shaped with the... View Article
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Which Group Are Called Craniates And Why?
Vertebrates are called craniates. Vertebrates include complex chordates, which have a brain and a brain box. The notochord, is wholly... View Article
Why Are Hemichordata Placed As An Independent Phylum Under Non-chordata?
Hemichordates are comparatively low-organized animals. They remain strange in terms of their relationship. It is doubtful whether the gill slits,... View Article
What Is Cephalization?
Annelids are the first group of non-chordates that show cephalization. Union of a few of the anterior body segments to... View Article
Why Are Sponges Said To Be The Simplest Group Of Multicellular Organisms?
Most of the members of this group are marine even though there are a few freshwater species. They are more... View Article
What Is The Necessity Of Classification?
There are more than a million species of animals and half a million species of plants described in the biosphere.... View Article
Write About Crown Gall.
It is caused by a bacterium called Bacterium tumefaciens. Any dicot plant, roadside trees, etc. can be infected by this... View Article
What Are The Control Measures Taken In The Case Of Tikka Disease Of The Groundnut?
The control measures are as follows – Crop rotation reduces infection Burning of diseased plants of the previous years. Otherwise... View Article
What Are The 5 Demerits Of Engler And Prantl’s System Of Classification?
Demerits – Monocotyledons have been placed before dicotyledons in the system which is against the modern phylogenetic concepts, which was... View Article
What Are The 5 Merits Of Engler And Prantl’s System Of Classification?
Merits – Plants are grouped in a logical sequence of progressive evolution. Hence, it is a phylogenetic system Gymnosperms are... View Article
What Is Hesperidium?
It is a characteristic fruit in the citrus species. The fruit is developed from superior, multicarpellary and syncarpous ovaries where... View Article
What Are The Changes Observed In The Flower Post-fertilization?
As a result of fertilization, the following changes are observed in the flower – Diploid zygote is formed which develops... View Article
What Are The Three Fusions Occurring In The Embryo Sac?
Generally, three fusions occur in the embryo sac as follows – The fusion of two polar nuclei to form a... View Article
Give The Significance Of Cross-pollination In Contrast To Self-pollination.
The continued self-pollination through generations results in a weaker progeny as there is no genetic recombination. Due to cross-pollination improved... View Article
What Is The Lever Mechanism In Salvia?
Flowers of Salvia have two stamens which are epipetalous. The two anther lobes are connected by a long curved connective.... View Article
Describe The Nectar Feature Of Entomophilous Flowers.
Nectar is a sugary fluid or honey produced by many flowers. The gland that produces nectar is called the nectary.... View Article
Brief About The Colour Feature Exhibited By Entomophilous Flowers.
The entomophilous flowers exhibit three general features namely colour, scent and nectar. Colour – flowers of different plants become conspicuous... View Article
What Are Some Features Of Anemophilous Flowers?
Anemophily is pollination by wind. The anemophilous flowers exhibit these features – Flowers are small They do not have attractive... View Article
Under Which Conditions In Flowers Autogamy Becomes A Rule?
Even if self-pollination is normally prevented, in some flowers, autogamy becomes a rule under the following conditions – Cleistogamy –... View Article
What Are The Different Types Of Ovules?
Ovules are classified into four main types based on the position of the micropyle with reference to the funiculus (ovule’s... View Article
