Biology Today — January 2018
Parts of a Typical Leaf Leaf base ( Hypopodium) Basal part of leaf by which it is attached to the node of stem. Swollen leaf bas ...
Venation The arrangement of veins and veinlets in the lamina of a leaf is called venation. Depending upon the distribution patt ...
Types of Leaf Possess a single or undivided lamina with smooth or incised margins but the marginal incisions are not deep up to ...
Functions of Leaf Leaves are the main seat of transpiration. Buoyancy in some aquatic plants such as Eichhornia, etc. Leaves pro ...
Racemose An indeterminate type of inflorescence which shows indefinite growth and bears a number of flowers due to the presence ...
Capitulums are of two types viz., homogamous and heterogamous. Homogamous head – In homogamous heads, all florets are alike in ...
Hygroscopic aerial roots are able to absorb water from atmosphere due to the presence of (a) root hair (b) haustoria (c) velame ...
Consider the following statements and select the incorrect ones regarding the modifications of stem. I. Twiners are flexible an ...
Statement 2 : Pneumatophores help the plant to get oxygen for respiration. (a) Both statements 1 and 2 are true and 2 is the cor ...
Which of the following is responsible for initiating the rhythmic activity of heart? (a) Atrio-ventricular node (b) Sinoatrial ...
Match column I with column II and select the correct option from the codes given below. Column I Column II A. Heart failure (i) ...
(ii) Systemic circulation is the flow of oxygenated blood from heart to body and deoxygenated blood from body to heart. (iii) Ad ...
A person who is on a long hunger strike and is surviving only on water, will have (a) less amino acids in his urine (b) more gl ...
Sexual reproduction takes place by following processes: CONCEPT MAP Fungi is a large kingdom comprising of about 5100 genera and ...
Humans exhibit sexual dimorphism, i.e., male and female individuals are differentiated externally. Both male and female reproduc ...
Ureter Symphysis pubis Prostatic urethra Corpus spongiosum Testicular artery and vein Bulbospongiosus muscle Epididymis Corpus c ...
TESTES : THE PRIMARY MALE SEX ORGANS Testes are the components of both reproductive system and endocrine system and thus are hom ...
REPRODUCTIVE DUCTS The reproductive ducts include rete testis, vasa efferentia, epididymis, vas deferens, urethra and ejaculator ...
External Genitalia : Penis It is the male copulatory organ and serves both as a reproductive organ and urinal duct. Unlike other ...
Ejaculation The penis is inserted into the vagina of female and the friction of rhythmic movements of penis stimulates the relea ...
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