HUMAN REPRODUCTION – The Male Reproductive System, The Female Reproductive System, Gametogenesis, Menstrual Cycle, Fertilization and Implantation, Pregnancy and Embryonic Development and Parturition and Lactation As you are aware, humans are sexually reproducing and viviparous. The reproductive events in humans include formation of gametes (gametogenesis), i.e., sperms in males and ovum in females, transfer of …
REPRODUCTION – SEXUAL REPRODUCTION IN FLOWERING PLANTS (Flower – Pre-fertilization, Stamen, Microsporangium and Pollen Grain, The Pistil, Megasporangium (ovule) and Embryo sac, The Megasporangium (Ovule), Megasporogenesis, Female gametophyte, Pollination, Agents of Pollination, Outbreeding Devices, Pollen-pistil Interaction, DOUBLE FERTILISATION, POST-FERTILISATION : STRUCTURES AND EVENTS, APOMIXIS AND POLYEMBRYONY) FLOWER – A FASCINATING ORGAN OF ANGIOSPERMS Human beings …
REPRODUCTION – REPRODUCTION IN ORGANISMS REPRODUCTION IN ORGANISMS (Sexual and Asexual Reproduction) (Sexual Reproduction – Pre-fertilization Events, Gametogenesis, Gamete Transfer, Fertilization, Post Fertilization Events, Zygote and Embryogenesis) Biology in essence is the story of life on earth. While individual organisms die without fail, species continue to live through millions of years unless threatened by natural …
What is CUET? – (Common University Entrance Test) WHAT IS CUET? CUET is the test conducted for admission into all UG Programmes in all Central Universities. CUET gives common platform and equal opportunities to candidates across the country. This test will help candidates from rural and remote areas to get admission with the Universities. This …
NCERT 11TH STANDARD BIOLOGY – THE TISSUES AND THE TISSUE SYSTEM THE TISSUES A tissue is a group of cells having a common origin and usually performing a common function. A plant is made up of different kinds of tissues. Tissues are classified into two main groups, namely, meristematic and permanent tissues based on whether …
NCERT 11TH STANDARD BIOLOGY – THE STEM The stem is the ascending part of the axis bearing branches, leaves, flowers and fruits. It develops from the plumule of the embryo of a germinating seed. The stem bears nodes and internodes. The region of the stem where leaves are born are called nodes while internodes are …
NCERT 11TH STANDARD BIOLOGY – THE ROOT In majority of the dicotyledonous plants, the direct elongation of the radical leads to the formation of primary root which grows inside the soil. It bears lateral roots of several orders that are referred to as secondary, tertiary, etc. roots. The primary roots and its branches constitute the …
NCERT 11TH STANDARD BIOLOGY – THE LEAF The leaf is a lateral, generally flattened structure borne on the stem. It develops at the node and bears a bud in its axil. The axillary bud later develops into a branch. Leaves originate from shoot apical meristems and are arranged in an acropetal order. They are the …
NCERT 11TH STANDARD BIOLOGY – THE INFLORESCENCE AND THE FLOWER THE INFLORESCENCE A flower is a modified shoot wherein the shoot apical meristem changes to floral meristem. Internodes do not elongate and the axis gets condensed. The apex produces different kinds of floral appendages laterally at successive nodes instead of leaves. When a shoot tip …
NCERT 11TH STANDARD BIOLOGY – THE FRUIT , THE SEED, SEMI-TECHNICAL DESCRIPTION OF A TYPICAL FLOWERING PLANT THE FRUIT The fruit is a characteristic feature of the flowering plants. It is a mature or ripened ovary, developed after fertilisation. If a fruit is formed without fertilisation of the ovary, it is called a parthenocarpic fruit. …