Download nutrition in plants

BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034
SCIENCE
NOTES: NUTRITION IN PLANTS TERM 1
CLASS 7
Q1 Define the following terms
1 Nutrition-It is the mode of taking food by an organism and its utilization by the body.
2 Autotrophic Nutrition-The mode of nutrition in which organisms make food themselves
from simple substances is called autotrophic nutrition
3Hetrotrophic Nutrition-The mode of nutrition in which organisms depends on others for
their food is called hetrotrophic nutrition.
4Photosynthesis-It is the process by which green plants can prepare their own food in the
presence of sunlight,carbondiooxide,water,minerals and chlorophyll.
Q2 How are water and minerals absorbed by roots reach the leaves?
A Water and minerals are transported to the leaves by the vessels which run like pipes
throughout the root,stem,branches and leaves.
Q3 List down the requirements of photosynthesis?
A . 4 requirements of photosynthesis are1 Carbondioxide –is taken through stomatas
2 Water and minerals- are transported to the leaves by the vessels.
3 Chlorophyll-is present in the leaves of the plants.
4 Sunlight-is absorbed by the chlorophyll present in the leaves.
Q4 Can Spirogyra prepare its own food. If yes how?
A Spirogyra can prepare its own food with the help of chlorophyll.
Q5 In what form plants prepared ands stored their food?
A Plants prepared their food in the form of sugar and stored in form of starch.
Q6 Define the term hetrotrophic nutrition.
A It is a type of nutrition in which organisms depend on others for their food.eg rat
Q7 Differentiate betweena)parasites and saprophytes
b) parasite and host
Parasites
Saprophytes
Parasites are those organisms which feed
on living organisms for the food eg
Cuscuta
Saprophytes are those organisms which feed
on dead decayed organic matter.eg bacteria
PARASITES
HOST
Are those organisms which feed on host.
2) they are always benefitted
Host are those organisms from which
parasite obtain food .
2) they are at loss.
Q8 What are insectivorous plants? How do they obtain their food?
A Insectivorous plants are those plants which eat insects.
Q9 How does pitcher plants obtain their food?
A In pitcher plant pitcher like structure is the modified part of the leaf. The apex of the
leaf forms a lid which can open and close the mouth of the pitcher. Inside the pitcher
there are hairs which are directed downwards. When an insect lands in the pitcher, the lid
closes and the trapped insects get entangled into the hair. The insect is digested by the
digestive juices secreted in the pitcher.
Q10 Identify the mode of nutrition in the followinga) Cuscuta -Parasitic mode of nutrition
b) Mushroom-saprophytic mode of nutrition
c) Spirogyra- Autotrophic mode of nutrition
Q11What is symbiotic relationship?
A Some organisms live together and share shelter and nutrients. This is called symbiotic
relationship.
Q12 Name two commonly growing saprophytes.
A Two commonly growing saprophytes areBacteria, fungi.
Q13 How do saprophytes obtain nutrition?
A They secrete digestive juices on the dead decayed and decaying matter and convert it
into solution. Then they absorb the nutrients from it.
Q14 How nutrients are replenished in the soil?
A Nutrients are replenished in the soil IN THE FOLLOWING WAYS1 Fertilizers
2 Manures
3 Rhizobium
Q15 How does Rhizobium help a farmer?
A Rhizobium is a bacteria that lives in the root nodules of leguminous plants like pea,
moong, beans .It takes atmospheric nitrogen and convert it into a soluble form which is
then utilized by plants.
Q16Lichens exhibit symbiotic relationship. Comment.
A In lichens algae and fungus live together. The fungus provides shelter ,water and
minerals to the alga and in return the alga provides food which it prepares by
photosynthesis.
Q17 Draw a well labeled diagram of cross section of leaf .
Q 18 Draw a well labeled diagram of stomata.