Biology Today — May 2017

(a) (i), (ii) and (iv) only (b) (ii), (iii) and (iv) only (c) (i) and (iii) only (d) (ii) and (iv) only Which of the following ...

At Chemical Synapse Mechanism of chemical transmission across a synapse is as follows: Action potential arrives at axon terminal ...

HUMAN FEMALE REPRODUCTIVE SYSTEM Human beings exhibit sexual dimorphism, i.e., male and female individuals are differentiated ex ...

Fig.: Female reproductive system showing primary and secondary sex organs Wall of Uterus Broad ligament supports uterine tubes, ...

External Genitalia (Vulva): The external genitalia in human female is collectively called vulva. Fig.: External genitalia in hum ...

• Lactation (milk secretion and ejection) is the main function of mammary glands. • During pregnancy, mammary glands grow ...

Stages in Oogenesis (Multiplication phase) (Maturation phase) (Growth phase) Fetal life mitosis Oogonia Primary oocyte Secondary ...

Follicular Development • During the course of maturation, the primary oocyte become surrounded by a single layer of squamous ...

Cortical granules Nucleus Polar bodies Cytoplasm Plasma membrane Zona pellucida Ovum Cells of the corona radiata Structure of Ov ...

(^12) 3 4 5 6 7 8 9 10 11 12 (^1716151413) 18 19 20 21 22 23 24 25 26 2728 Mens tru ati on Fo llic ula r (^) o r (^) p or feli t ...

Menopause • It is a phase in woman’s life when ovulation and menstruation stop. During this condition, ovaries fail to respon ...

New MCQs Select the option which correctly fills the given blanks. (i) Fallopian tubes are attached to the ovaries through ___ ...

Consider the following statements and select the option stating which ones are true (T) and which ones are false (F). (i) Cessa ...

The figure given below depicts a diagrammatic sectional view of the human female reproductive system. Which set of three parts ...

Assertion : Germinal epithelial cells of ovary produce oogonia. Reason : Oogonia are formed during fetal development. Asserti ...

61 • Health is a state of optimum physical fitness, mental maturity and social well being. • A disease is a particular abn ...

TYPES OF DISEASES Congenital Diseases • Inborn diseases, i.e., diseases with which a person is born. Acquired Diseases • D ...

COMMUNICABLE DISEASES • These are classified into nine types according to the nature of pathogen, i.e., the disease causing a ...

Bacterial Diseases Typhoid • Typhoid is a common bacterial disease caused by a rod-like bacterium, Salmonella typhi, which is ...

Pneumonia Streptococcus pneumoniae, Haemophilus influenzae Direct contact / 1 - 3 days Cough, fever, pain in the lungs ...