Updated: Aug 7, 2020
CBSE exams for class 10 are already begun from February 21, 2019. In Karnataka Class 10 exam will be held on March 21 to April 4.Students are always surfing study materials to score more in their Board Exam. In these days, reference to the new scheme or pattern of question paper its easy to pass, to secure highest marks they should work hard.Many of students love to draw diagrams than writing theory. Even highest scorer loses one or two marks due to improper or unlabeled diagrams.So here are some important diagrams from biology to practice for your annual exam.
1. CROSS-SECTION OF LEAF
Leaf is a kitchen of the plant body where photosynthesis is occurs. Cross section of leaf shows the presence of green dots inside the cell are called chloroplast which contain chlorophyll. Upper and lower epidermis covers the mesophyll. Mesophyll is differentiated into spongy and palisade parenchyma in dicotyledonous leaves. Epidermis is provided with small openings called stomata.
2. STOMATAL APPARATUS
Stomata are the tiny pores present on the surface leaves. Help in transpiration (evaporative loss of water) ans gaseous exchange. Each stoma is made up of bean shaped guard cells, they helps on opening and closing of the stomatal pore. Guard cells are covered by subsidiary cells.
3. HUMAN ALIMENTARY CANAL
Human digestive system consists of the gastrointestinal tract and the accessory organs of digestion (the tongue, salivary glands, pancreas, liver and gall bladder).
4. L.S OF HUMAN HEART
The heart is a muscular organ helps to pump the blood to the various tissues of our body. The heart has different chambers to prevent the mixing of oxygenated and de-oxygenated blood. Upper chambers of the heart are called atria and the lower chambers of the heart are called ventricles. The walls of ventricles are thicker than the walls of atria, because to pump the blood to various parts.
5. EXCRETORY SYSTEM OF HUMAN
The Excretory system of human beings includes a pair of kidneys, a pair of ureters, a urinary bladder and a urethra. kidneys are located in the lower abdominal cavity, one on either side of the backbone. Urine produced in the kidneys passes through the ureters into the urinary bladder where it is stored until it is released through the urethra.
Nephron is a functional unit of kidney. It has two parts, namely, glomerulous and renal tubules. Glomerulous is a tuft of blood capillaries present in side a cup-like structure called Bowmann's capsule. Renal tubule consists of Bowmann's capsule, proximal and distal convoluted tubules, Henle's loop and collecting tubule.
7. HUMAN BRAIN
Human brain is a part of central nervous system. Human brain has three three divisions, namely, fore-brain, mid-brain and hind-brain.Fore-brain- Consists cerebrum (large part of the brain), and diencephalon (thalamus and hypothalamus).Mid-brain- Consists lymbic system and act as bridge between fore-brain and hind-brain.Hind-brain- Consists cerebellum (maintains body balance), pons (regulates mastication, respiration and facial expression) and medulla oblongata (regulates most of the involuntary activities).
Flower is a reproductive organ of angiosperm plants. Floral parts are arranged in four different whorls. They are calyx, corolla, androecium and gynoecium. Stamens and carpels are the male and female reproductive structure of a flower respectively.
9. GERMINATION OF POLLEN ON STIGMA
After the pollen lands on suitable stigma, it has to reach the female germ-cells which are in the ovary. For this, a tube grows out of the pollen grain and travels through the style to reach the ovary.
10. MALE REPRODUCTIVE SYSTEM OF HUMAN
The male reproductive system consists of a pair of testes, epididymis, vas deferens, seminal vesicles, prostate glands and a penis.
11. FEMALE REPRODUCTIVE SYSTEM OF HUMAN
The male reproductive system consists of a pair of ovaries, a pair of Fallopian tube, a uterus, cervix and vagina.
12. REGENERATION IN PLANARIA
The process in which new individual is organisms are produced by the parental body parts. That is, if the individual is somehow cut or broken up into many pieces, many of these pieces grow into separate individuals.
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