Tuesday 2 February 2016

Notes - science - class 7 - chapter 1 - Nutrition in Plants


What is Nutrients?
The components of food such as carbohydrates,protein,fats,vitamins and minerals which are necessary for our body are called Nutrients.

What is Nutrition?
Nutrition is the mode of taking food by an organism and its utilisation by the body.

What is Autotrophic?
The mode of nutrition in which organism make food themselves from simple substances is called autotrophic.
Auto= self; trophos= nourishment;  Therefore.plants are called autotrophs.

What is heterotrophs?
Animals and most other organisms take in ready made food prepared by the plants. they are called heterotrophs. (heteros=other)


What are cells?
The bodies of living organisms are made of tiny units called cells.

What is cell membrane?
The cell is enclosed by a thin outer boundary called the cell membrane.

What is nucleus and cytoplasm?
Most cells have a distinct,centrally located spherical structure called the nucleus.
The nucleus is surrounded by a jelly like substance called cytoplasm.


What is stomata?
The tiny pores that is present on the surface of the leaves called stomata.

What is chlorophyll?
A green pigment, present in all green plants, which is responsible for the absorption of light to provide energy for photosynthesis.

What is photosynthesis?
The process in which plants use to make their food with the help of chlorophyll,sunlight,water and carbon-dioxide to prepare food and release carbohydrate and oxygen.


Algae?
A simple  typically aquatic plant of a large assemblage that includes the seaweeds and many single-celled forms. Algae contain chlorophyll but lack true stems, roots, leaves, and vascular tissue.

Cuscuta?
This is a plant. it does not have chlorophyll. it takes ready made food from the plant on which it is climbing.

  Host?
The plant on which it climbs is called a host.

Parasite?
An organism which lives in or on another organism (its host) and benefits by deriving nutrients from others.

What is insectivorous plant?
A plant that captures and digests insects either passively (as the common pitcher plant or the sundew) or by the movement of certain organs (as the Venus's-flytrap) — are called insectivorous plant.

What is fungi?
Fungi derive nutrition from dead and decaying matter.


What is saprotrophic nutrition?
This mode of nutrition in which organisms take in nutrients in solution form from dead and decaying matter is called saprotrophic nutrition.

Saprotrophs?
Plants which use saprotrophic made of nutrition are called saprotrophs. 

What is symbiotic relationship?
Some organisms live together and share shelter and nutrients.this is called symbiotic relationship. 

What is lichens?
A simple slow-growing plant which typically forms a low crust-like, leaf-like, or branching growth on rocks, walls, and trees.






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