Biology Today - February 2018

Types Lomentum It develops from mono- carpellary, superior, unilocular ovary. The fruit arises just like a legume but when ripen ...

Simple Succulent Fruits In these fruits, the pericarp and its associated parts become fleshy. These are of following types: Pepo ...

AGGREGATE FRUITS An aggregate fruit or etaerio is a group of fruitlets which develop from multicarpellary apocarpous ovary. Aggr ...

Structure of Dicotyledonous Seed Structure of Monocotyledonous Seed The monocotyledonous seeds possess a single cotyledon and ar ...

Floral Formula It is a symbolic representation of floral symmetry, presence or absence, number, cohesion and adhesion of variou ...

Androecium Ten, usually diadelphous [(9) + 1], anthers dithecous, introrse dehiscence longitudinal Stamens five, epipetalous, fi ...

Replum, a false septum that develops between two parietal placentae is found in (a) $UJHPRQH (b) &DSSDULV (c) mustard (d) p ...

I II III IV (a) T T F T (b) T F T F (c) F F T T (d) F T F T Study the given table and identify A, B, C and D. Name Type of fru ...

In a complex multicellular organism, all functions like digestion, respiration, reproduction, etc., are carried out by different ...

EPITHELIAL TISSUE An epithelium or epithelial tissue is composed of one or more layers of cells covering the external and intern ...

Simple cuboidal epithelium Consists of short, cube-shaped cells. Nuclei are located in the centre of the cell. The cells of cubo ...

II. Compound Epithelia (Multilayered Epithelia) (a) Stratified epithelium Stratified squamous epithelium Consists of several cel ...

Glandular Epithelium (Glands): Some of the epithelial cells get specialised for secretion and are called glandular epithelium. ( ...

Excretion Exchange of gases Sensation Conduction of fluids Functions of Epithelial Tissues Protection Formation of exoskeleton S ...

Loose Connective Tissue It has loosely arranged cells in a semi-fluid ground substance. Table: Types of loose connective tissue ...

Table: Types of dense regular connective tissue White fibrous connective tissue Yellow elastic connective tissue Structure It co ...

Structure of mammalian bone Mammalian bone consists of four parts : (i) Periosteum : It is a thick and tough sheath of collagen ...

Types of bones On the basis of texture, a bone is of two types : compact and spongy (cancellate) bone. Table : Types of bones Ch ...

Agranulocytes Lymphocyte – It has a large rounded nucleus and its cytoplasm lacks granules. It is motile, non-phagocytic and pr ...

(a) Marrow cavity has yellow marrow. (b) It is found at the epiphysis of long bones. (c) Lamellae are arranged as interlacing ne ...