Maharashtra Board Class 7 Science Solution Chapter 4 – Nutrition in Living Organisms
Balbharati Maharashtra Board Class 7 Science Solution Chapter 4: Nutrition in Living Organisms. Marathi or English Medium Students of Class 7 get here Nutrition in Living Organisms full Exercise Solution.
|Maharashtra Class 7|
General Science Solution
Nutrition in Living Organisms
|Group A||GROUP B|
|1. Parasitic Plant.||D) Cuscuta|
|2. Insectivorous plant||c) Drosera|
|3.Saprophytic plant.||A) Mushroom|
|4. Symbiotic plant||b) Lichen.|
A) WHY DO LIVING ORGANISMS NEED NUTRITION?
ANS:- All loving organisms need nutrition. It is required for growth and development of the body. It increase immune power to fight diseas. Its supplies the energy required for doing work and it replaced the damaged cells and repair toissues.
B) EXPLAIN THE PROCESS OF PRODUCTION OF FOOD IN PLANTS.
ANS:- Plants also need food for their growth. They can produce their own food. With th help of sunlight and chlorophyll, plants make their food in their leaves using water and nutrients from the soil and carbondioxide from the air. This process is called as photosynthesis.
C) WHAT IS MEANT BY PARASITIC PLANTS? NAME THEIR DIFFERENT TYPES WITH EXAMPLES OF EACH.
ANS:- The plants that grow on the body of the other plants to obtain food are called as parasitic plants. Examples- Loranthus, cuscta.
d) EXPLAIN THE VARIOUS STEPS OF NUTRITION IN ANIMALS.
ANS:- Nutrition in animals involves various steps from ingestion to egestion. Steps of Nutrition-
1.) Ingestion- Food is taken into the body.
2.) Digestion-Conversion of food into simple soluble forms.
3.) Absorption- Transfer of soluble food to the blood.
4.) Assimilation- Utilization of absorbed food by cells and tissues for energy production, growth and repair.
5.) Egestion- Removal waste products and undigested food from the body.
E) NAME SOME UNICELLULAR ORGANISMS IN WHICH ALL LIFE PROCESS TAKE PLACE WITHIN THEIR UNICELLULAR BODY.
ANS:- The name of that unicellular organisms are- Ameoba, Euglena, Paramoecium.
a) INSECTIVORUS PLANTS ARE ATTRACTIVELY COLOURED.
ANS:- Insectivorus plants are attractively coloured so they can attract insects towards them and feed then.
b) BUTTERFLIES HAVE A LONG TUBE LIKE PROBOSCIS.
ANS:- Butterflies have a long tube like proboscis that enables them to drink juice and nectar.
a) WE PREPARE A VARIETY OF FOODSTUFFS AND DISHES AT HOME. ARE WE THEN AUTOTROPHIC ORGANISMS?
ANS:- We prepare variety food and dishes at home. But we don’t autotrophic. Autotrophic is used for organisms that can produce their own food. WE DEPEND ON PLANTS for food and making of variety foodstuffs. Autotrophic foodstuffs contain chloroplast that is neceassity to be classified as an autotroph. So we cannot be considered autotrophs.
b) WHICH ORGANISMS ARE GREATER IN NUMBER AUTOTROPHS OR HETEROTROPHS?
ANS:- Autotrophs are the organisms that are greater in number. Heterotrophs are dependent on autotrophs. If heterotrophs exceed the number then all the autotrophs will vanish. So that autotrophs are always more than heterotrophs.
c) THE NUMBER OF HETEROTROPHS FOUND IN DESERT REGIONS IS SMALLER. HOWEVER THEY ARE FOUND IN GREATER NUMBERS IN THE SEA. WHY IS THIS SO?
ANS:- The number of heterotrophs are found in desert regions is smaller because the condition of desert areas is very difficult. There are only few types of organisms found in the region. There are not seen many kinds of animals and plants in this region. So the number of heterotrophs are less to found in this region. But in the sea they are found in greater numbers. Here the environment supports the heterotrophs to survive more than in desert region.
d) WHAT DAMAGE OR HARM DO ECTOPARASITIC AND ENDOPARASITIC ANIMAL CAUSE?
ANS:- Ectoparasitic and endoparasites are devoid the host of the nutrition. Some of the the parasites causes diseases that is an endoparasite. endoparasite that lives in lymphatic vessels of lower limbs. Lice or ticks are found in humans and dogs respectively that is an ectoparasite. They absorb the nutrients from their host.
e)WHY IS A PLANT FOOD NOT PRODUCED IN ANY OTHER PARTS OF THE PLANT EXCEPT THE GREEN ONES?
ANS:- Plant food is produced by a process which known as photosynthesis. The process of photosynthesis happened in the chloroplast of leaves. These structures are found in the only in green region of plants. The green colour of specific parts of plants is due to presence of chlorophyll pigment present in these chloroplast. Those plants that do not contain chloroplast do not appear green in colour are not capable to produce food.