lakhmir singh science class 7 solutions chapter 1

 

 

[1] Name the ………………………. gases.

Through Stomata Leaves Exchange Gases.

 

[2] Name the process ………………………food.

Plants Make Food by The Process Called Photosynthesis.

 

[3] What is photosynthesis?

The Process by Which Plants Make Food with The Help of Carbon Di-Oxide, Sunlight and Water Is Called Photosynthesis.

 

[4] True or False

Carbon Dioxide ………………Photosynthesis. [False]

Reason – During Photosynthesis Oxygen Is Released.

Solar Energy ……………………….Photosynthesis. [True]

The Product of………………..Not A Protein. [True]

Reason: – The Product of Photosynthesis Is Glucose Which Is a Carbohydrate.

A Plant Having Red Leaves…………………… Photosynthesis. [True]

Reason- Chlorophyll Is Required for Photosynthesis Which Is Only Found in Green Plants.

Plants Which Synthesize Their Food Themselves Are Called Saprotrophs. [False]

Reason- Plants Which Synthesize Their Own Food Are Called Autotrophs While Saprotrophs Are Plants Which Feed On Dead and Decaying Matter.

 

[5] Name Any One Plant Which ……………………… Its Roots.

Peas, Beans, and Peanuts Has Rhizobium Bacteria in Its Roots.

 

[6] What Do the Patches of …………………………………………………………. Ponds and Lakes Consist of?

The Green Layer Floating On the Surface of Stagnant Water Bodies Are Called Algae.

[7] Why Are Algae Green?

Because of Chlorophyll Algae Are Green.

[8]

[A] Gas Used in Photosynthesis Is Carbon Di-Oxide

[B] Gas Produced in Photosynthesis Is Oxygen.

 

[9]

[A] Autotrophs Can Make Their Own Food.

[B] Heterotrophs Depend On Other Organisms for Food.

 

[10] Rhizobium Bacteria …………………………… Known as?

Symbiotic Relationship.

 

[11] What Name Is Given …………………………………………………… In Lichens?

Symbiotic Relationship

 

12) Where Does …………………. Take Place.

In Leaves, Leaves Is Known as The Kitchen of Plant.

 

13) Why Are The ………………… Green?

The Leaves of Plant Green Due to Chlorophyll Pigment.

 

14) Name The Green……………………. Leaves of Plant.

Chlorophyll.

 

15)  Name Three …………………. Manures.

Nitrogen, Phosphorus, and Potassium.

 

16)  Name The Bacteria……………………………. Compounds.

Rhizobium Bacteria.

 

17) What Type……………………………………. Nodules.

Symbiotic Plant.

 

18)  Name Any Two…………………………………… Plants.

Pea Plant, Beans Are Two Leguminous Plants.

 

19) Name Autotrophic ………………. Plant.

Autotrophic Plant – Neem and Heterotrophic –

 

20) Name A Parasitic …………………. Stem.

Cuscuta Plant or Amarbel in Hindi

 

21) Name A Plant ………………………. Nutrition.

Pitcher Plant Is Also an Insectivorous Plant.

 

22) Name One Plant in Which…………………… Plant Part.

Photosynthetic activity in algae occurs separately from leaves. Chlorophyll Is Found Inside Plant Cells in a Small Structure Called Chloroplasts.

23) Name Four Food Made by Plants………………………. Diet.

Carbohydrates, Fat, Protein, And Vitamin.

 

24) The Heterotrophic ……………………. Groups.

Insectivorous Plant and Symbiotic Plant.

 

25) Fill in The Blanks

  1. Mushroom; Yeast
  2. Solution
  3. Air
  4. Alga
  5. Fungus
  6. Starch
  7. Chlorophyll
  8. Carbon-Di-Oxide; Oxygen
  9. Oxygen
  10. Glucose
  11. Proteins
  12. Cells.

 

Short Answer Type Questions Solution

 

26) Match the column I with column II :

Column I Column II
Chlorophyll Rhizobium bacteria
Nitrogen Heterotrophs
Amarbel Pitcher Plant
Animals Leaf
Insects Parasite

 

27) How would you……………..leaves?

Starch can be detected by putting an iodine solution on a leaf that appears blue-black after boiling it in alcohol, indicating starch’s presence.

 

28) What is the special………….plant cannot?

The chlorophyll pigment in leaves enables plants to synthesize food.

 

29) In addition to carbon………..take place.

The other requirement for photosynthesis is chlorophyll and sunlight in addition to carbon-di-oxide and water.

 

30) Consider the following organism

(a) an autotroph:- Grass.

(b) a saprophyte:- Mushroom.

(c) symbiotic plant:- Lichen.

(d) a partial heterotrophy:- Pitcher plant.

(e) a parasite:- Cascuta plant.

 

31) Why do organisms…………….organisms?

For organisms to have energy and work, they need food. The two main forms of nutrition are carbohydrates and vitamins.

 

32) What is meant by ……………….autotroph.

Autotrophic organisms are those which are able to produce food for themselves through photosynthesis—example: Green plant.

 

33) What is meant by………………heterotroph.

Heterotrophs are organisms that do not make food themselves from simple substances through the process of photosynthesis. Example: Fungi.

 

34) Explain why we……………………plants do.

Due to a lack of chlorophyll, humans cannot produce food by photosynthesis as plants do.

 

35) What are insectivorous………………plant.

plants that obtain their food from insects are called insectivorous plants. Example: Pitcher plant.

 

36) Why do farmers……………….fields?

By applying manures and fertilizers to the soil, farmers enrich the soil with nutrients, such as nitrogen and phosphorous.

 

37) What are plant…………………… parasites.

Parasites are plants or animals that live on or inside another living organism called hosts and gain their food from them. Example: Cuscuta.

 

38) What are saprophytes……………….saprophyte.

Those non-green plants which obtain their food or nutrition from dead and decaying organic matter are called saprophytes. Example: fungi.

 

39) Proteins are nitrogenous …………………..making proteins?

Nitrogen gas is abundant in the air. Plants cannot absorb this gas. A certain type of bacteria in soil converts nitrogen gas from the air into nitrogen compounds, which are released into the soil.

 

 

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