2021-22 GRADE 7 SCIENCE CH 1 NUTRITION IN PLANTS (NOTEBOOK AND WORKBOOK EXERCISE)
SCIENCE NOTEBOOK FORMAT VIDEO
CH 1 NUTRITION IN PLANTS
(NOTEBOOK EXERCISE AND WORKBOOK EXERCISE)
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NOTEBOOK WORK
DIAGNOSTIC TEST- GOOGLE FORM
KWL CHART-
NOTE: Q 1,2,3,4 TO BE DONE IN TEXTBOOK
CH 1
NUTRITION IN PLANTS
NEW WORDS
1. heterotrophic
2. detritivores
3. parasitic
4. symbiotic
5. saprotrophs
NEW TERMS
1. Guard cells: the cells surrounding the stomata which regulate the opening and closing of the stomata.
2.Chloroplasts: structures present in the leaves that serve as the site of photosynthesis.
Answer the following in one word or one sentence.
a. A plant having two halves which snap shut when an insect sits on it.
ANS. Venus Fly Trap
b. The modified sucking roots in parasitic plants.
ANS. Haustoria
c. A relationship between two organisms in which both are benefited.
ANS. Symbiosis
d. The tiny pores present on the leaves through which gases enter and exit the plant.
ANS. Stomata
Answer the following questions in short.
a. How does carbon dioxide enter the plant?
ANS. The carbon dioxide present in the atmosphere is taken up by plants through small openings present on the surface of the leaves. These tiny openings are called stomata.
b. Explain the term heterotrophic nutrition.
ANS. Heterotrophic nutrition is a type of nutrition in which plants cannot make their own food and depend on other sources of food for their survival. Organisms that show the heterotrophic mode of nutrition are called heterotrophs.
c. Name the two types of decomposers.
ANS. Decomposers are of two types detritivores and saprotrophs based on how they decompose organic matter.
• Detritivores
• Saprotrophs
d. List the materials necessary for photosynthesis.
ANS. Plants need carbon dioxide, water, sunlight and chlorophyll for the process of photosynthesis.
Give reason.
a. Insectivorous plants rely on insects for nutritional needs.
- ANS. Insectivorous plants generally grow in soils deficient in minerals especially, nitrogen.
- These plants are able to carry out photosynthesis for production of food.
- The only obstacle in the process of growth is the absence of nitrogen which they obtain by feeding on insects.
- Thus, Insectivorous plants rely on insects for nutritional needs.
b. The inner side of the jar shaped leaf of the pitcher plant has stiff hair like structures.
- ANS. Pitcher plants have leaves shaped like a pitcher or jar.
- The cavity formed by the jar shaped leaves is filled with nectar and attracts the flying or crawling insects.
- The inside of the leaf is very smooth and slippery, and has stiff hair like structures at the rim.
- These hair-like structures, once disturbed, close the opening of the pitcher by lowering the flap and the insect gets trapped inside. (DRAW DIAGRAM OF PITCHER PLANT)
Answer the following questions in detail.
a. Write a note on detritivores.
Decomposers are of two types detritivores and saprotrophs based on how they decompose organic matter.
• Detritivores– These organisms ingest the dead organic matter and digest and break it down internally into simple nutrients. Earthworms and dung beetles are examples of detritivores.
b. What is parasitism? Explain the two types of parasites.
ANS. An association between two organisms, in which one is benefited at the cost of the other, is called parasitism.
There are two types of parasitic plants – Partial parasites and Total parasites.
• Partial parasites – Some parasitic plants are photosynthetic and depend on the host only for water and minerals. Such plants are called partial parasites or hemi-parasites. Mistletoe is an example of a partial parasite.
• Total parasites – Some other parasitic plants depend completely on the host for sugar, minerals and water. Such plants are termed total parasites. Cuscuta (dodder) or Amarvel is a typical example of a total parasitic plant. It can be identified by thin stems appearing leafless, with the leaves reduced to minute scales.
c. How do leguminous plants enrich the soil?
- ANS. Many plants absorb soluble nitrogenous substances (either nitrate ions or ammonium ions) from the soil.
- Certain bacteria such as Rhizobium found in the root nodules of leguminous plants (peas, beans) convert gaseous nitrogen into soluble nitrogenous substances.
- In nitrogen deficient soils, plants enter into symbiotic partnerships with these bacteria to get soluble nitrogenous substances.
- This process is called nitrogen fixation. In turn, the plants provide other nutrients to the bacteria for growth.
Diagram based question.
(please draw diagram with pencil. Also all labelling should be done on right side)
a. Draw a neat and labelled diagram of a chloroplast and state its significance.
ANS. Leaves contain chloroplasts, which are the actual site for photosynthesis. Chloroplasts contain a green pigment called chlorophyll. Chlorophyll traps the light energy of the Sun necessary for the process of photosynthesis. The green colour of the leaves is attributed to the colour of the chlorophyll.
b. Identify and name the parts labelled as A, B and C in the adjoining figure.
- HOTS (Higher Order Thinking Skills)
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