Biology Learning Path
High School (11–12) Biology
Explore structured biology courses, solved problems, simulations and Python activities.
Choose a topic to see its subtopics.
Reproductive Health and Birth Control
What reproductive health means and why the growth of a population matters. Then the methods of birth control one by one: the natural and the barrier methods, the devices placed in the uterus, the pills, the injections and implants, and the surgical methods.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
Pregnancy Termination, Infections and Infertility
How a pregnancy can be ended in a safe and lawful way, and why a test of the fluid around a baby is controlled by law. How the common sexually transmitted infections spread and how they are prevented. What infertility is, and the methods by which doctors help couples to have a child.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
Reproductive Health: Comparing Methods and Technologies
Put the whole chapter side by side. See what each method of birth control stops and what it does not. Learn how the hormones of the pill act on the monthly cycle, and how the assisted reproductive technologies differ, step by step. The lessons end in the traps that questions often use.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
The Flower, the Stamen and the Male Gametophyte
What is inside a flower, and how does it make pollen? You open the anther, study the layers of its wall, and follow the cells that divide to form pollen grains. Then you look at one pollen grain closely and see why it counts as a male gametophyte. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Explore Course →
The Female Gametophyte, Pollination and Pollen-Pistil Interaction
How does an ovule make an egg, and how does pollen reach it? You study the pistil and the ovule, and follow the cell that divides to make the seven-celled embryo sac. Then you meet the kinds and agents of pollination, the devices that prevent self-pollination, and the dialogue between pollen and pistil. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Explore Course →
Double Fertilisation, Embryo, Seed and Fruit
Why does a flowering plant fertilise twice? You follow the two male gametes into the embryo sac, watch the endosperm and the embryo grow, and see how the ovule becomes a seed and the ovary a fruit. Then you meet the plants that make seeds without fertilisation. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Explore Course →
Hormones, the Hypothalamus, the Pituitary and the Thyroid
What a hormone is and why the body needs a second control system beside the nerves. How the hypothalamus controls the pituitary, what each pituitary hormone does, and what the pineal and thyroid glands add. Goitre, cretinism, gigantism and diabetes insipidus are explained as hormone slips.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
The Adrenal Gland, the Pancreas, the Parathyroid, the Thymus and the Gonads
How the adrenal glands prepare the body for an emergency and keep the salts in balance. How insulin and glucagon hold the blood sugar steady, and what goes wrong in diabetes mellitus. Then the parathyroid and the calcium of the blood, the thymus, and the hormones of the testis and the ovary.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
Hormones of the Heart, Kidney and Gut, Receptors and Integration
The hormones made outside the main glands, by the heart, the kidney and the gut. How a hormone finds its cell, and why a peptide hormone and a steroid hormone act in different ways. Then how feedback loops and the two control systems work together to keep the body steady.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
The Neuron and the Nerve Impulse
How is a message made in a nerve cell, and how does it cross to the next one? You build a neuron, read the voltage of its membrane at rest and during an impulse, and see why a coat of myelin makes a message faster. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
The Brain, the Spinal Cord and Reflexes
Which part of the brain keeps you breathing, and which part lets you read this line? You map the forebrain, the midbrain and the hindbrain, look at the spinal cord, and trace a reflex from the skin to the muscle and back. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →
The Eye and the Ear
How does light become a picture in the brain, and how does a sound become a nerve impulse? You study the parts of the eye, the rods and cones of the retina, the path of sound through the ear and the organs of balance. It serves the Indian syllabus (the NCERT chapter and the boards) and the matching topic of A-Level, IB and AP.
3Lessons10Problems2Python Labs1Question Set1Mock Test
Explore Course →