Escience zone

Posts

Showing posts with the label Class 11 Biology

Classification of Angiosperms Flowering plants

Classification of Angiosperms :-The Flowering Plants Monocots :- Single cotyledon Parallel veins Flowers in multiples of 3’s Dicots :- Two cotyledons Netted veins Flowers in multiples of 2, 4, or 5. MONOCOT-PLANT Dicot plant FRUITS :- SIMPLE Dry (poppy seed, milkweed, wheat) Fleshy (peach, plum, apple, tomato, grape). AGGREGATE Flowers with several carpels Raspberry, strawberry. MULTIPLE Cluster of flowers Pineapple. SIMPLE.AGGREGATED AND MULTIPLE FRUITS SEED STRUCTURES :- Micropyle Opening through which the pollen tube grows to deliver pollen to the ovary (ovules).

Frog-Digestion II ingestion II B.sc NotesII Class 11th notes

Frog-Digestion Digestion:- Mouth:- It is wide open bounded by the upper and lower jaw. Buccopharyngeal cavity: - The mouth leads into the buccal cavity that consists of Teeth:- Only the upper jaw contains teeth. All similar Homodont, Acrodont -not completely attached with bone, Crown, and base two-part present. Crown is formed by Dentine covered by Enamel. The tooth has a pupil cavity with Pulp. Mainly two types of teeth present -Maxillary and vomerine. Internal nares:- The pair of opening presents near the vomerine teeth. Bulging eyeballs:- These two large oval areas on the roof of the buccal cavity. Pharynx:- The pharynx consists of a Eustachian tube over the roof of it. It connects the pharynx with the middle ear. Vocal sac:- Opening of vocal sac present at the angle of the jaw which is present only in male frog during breeding season help in copulation. Tongue:- Tongue lies on the floor of the buccal c

Frog -Respiration II CutaneousII BuccopharyngealI I Pulmunocutaneous class 12th

Frog-Respiration Types of Respiration:- Cutaneous respiration Buccopharyngeal respiration Pulmonary respiration Cutaneous Respiration :- The skin of the frog is used as a respiratory organ. It is thin, moist, vascular, and permeable to gases. The O2 from outside diffuses into the blood and the Co2 from the blood diffuses out through the skin. Buccopharyngeal Respiration :- The buccal cavity and pharynx are lined with a thin mucous membrane that is moist, permeable, and vascular to gases and richly supplied with blood. The buccopharyngeal cavity is connected to the exterior by a pair of External nares, buccal cavity, and Internal nares. Inspiration :- When the throat is lowered the buccopharyngeal cavity becomes enlarged. This reduces the pressure of air in the buccopharyngeal cavity. Hence fresh a

Photosynthesis in Higher Plant

PHOTOSYNTHESIS IN HIGHER PLANTS Photosynthesis could be a purgative o – natural process, uses light-weight energy to synthesis organic compounds (sugar). Importance of photosynthesis: Primary supply of food • unleash O2 to atmosphere Photosynthesis Early Discoveries:- Joseph Priestly: Candle with bell glass and mouse experiment – He complete that air is important for the expansion of a plant. He discovered the very fact that plants restore atomic number 8 within the air. Priestly Experiment • Jan Ingenhousz: Experiment with hydrophytic plant in light-weight and dark – He complete that daylight is important for plant processes that purify the air. Jan Ingenhousz Experiment • Julius Von Sachs: Green components of plant build aldohexose and store as starch. • T.W. Engelmann: Spilt light-weight victimisation prism into seven colors (VIBGYOR) –

Plant growth and development

PLANT GROWTH AND DEVELOPMENT Growth: It is a characteristic of living beings within which associate irreversible permanent increase in size of associate organ or its elements occur or a rise within the size of a cell. Types of rate of growth :- Development in plant Growth rate are often outlined because the increase in growth per unit time. • Plants show 2 kinds of growth—Arithmetic and Geometric—according to the rise shown by the expansion rate. Arithmetic growth – Only one cell continues to divide whereas others differentiate or mature. Example:- root elongation at constant rate. Geometric Growth – Initial growth is slow (lag phase), followed by a fast increase in growth (log/exponential phase), and followed by a part wherever growth slows down (stationary phase). Example − all cells, tissues and organs show this sort of growth. Conditions for Growth :- Include: water, oxygen, nutrients and temperature. Differen

Mineral and Nutrition in plant-12th Class

Why is mineral nutrition important in plants? What are plant minerals? What do you mean by mineral nutrition? Where are mineral nutrients mostly used in plants? MINERAL NUTRITION Hydroponics:- It was given by Julius Von Sachs. aquacultural is growing of plants in an exceedingly outlined nutrient Solution, within the absence of soil. It helps the USA to review the result of adding, removing or variable the concentration of any specific mineral component. Essential components are often known by this technique, and their deficiency symptoms are often noted. Hydroponics Criteria for the importance of part are:- Absolutely necessary for the completion of the life cycle of a plant; necessary for its growth and copy. • Its demand is restricted, and not exchangeable by the other component. • Directly concerned with