RBSE Class 7 Science Important Questions Chapter 1 Nutrition in Plants

Rajasthan Board  RBSE Class 7 Science Important Questions Chapter 1 Nutrition in Plants Important Questions and Answers.

RBSE Class 7 Science Chapter 1 Important Questions Nutrition in Plants

Multiple Choice Questions

Question 1. 
Chlorophyll is present in special structures in the leaves called 
(a) xylem 
(b) phloem
(c) chloroplasts 
(d) nucleus
Answer:
(c) chloroplasts 

Question 2.
Insectivorous plants are grown in soil that is deficient in 
(a) oxygen 
(b) carbon
(c) nitrogen 
(d) all of these
Answer:
(c) nitrogen

Question 3. 
Gaseous exchange in plants takes place through
(a) chloroplast 
(b) roots
(c) stem 
(d) stomata
Answer:
(d) stomata

Question 4. 
Nutrients in the soil can be replenished by
(a) leguminous plants
(b) compost
(c) fertilizers
(d) all of these
Answer:
(d) all of these

Question 5. 
When we observe the lower surface of leaves through a magnifying lens, we see numerous small openings, which of the following is the term given to such openings?
(a) Stomata 
(b) Lemina
(c) Midrib 
(d) Veins
Answer:
(a) Stomata 

Fill in the blanks

Question 1.
................also takes place in green stems and branches.
Answer:
Photosynthesis

Question 2.
An association between fungi and algae is called................
Answer:
lichen

Question 3.  
................is an edible fungus.
Answer:
Mushroom

Question 4. 
The slimy, green patches in ponds or stagnant water are called................
Answer:
algae

Question 5. 
................test is done to test the presence of starch.
Answer:
Iodine

State Whether True or False

Question 1. 
All fungi that are harmful to humans were
Answer:
False

Question 2. 
Saprotrophs synthesize their own food.
Answer:
False

Question 3. 
Only one of the organisms benefits from a symbiotic relationship.
Answer:
False

Question 4. 
Leaves are the food factories of plants.
Answer:
True

Question 5. 
Dodder is a parasite plant.
Answer:
True

Match the following

Column I	Column II
1. Nitrogen	(a) Pitcher plant
2. Fungi	(b) Green leaves
3. Chlorophyll	(c) Photosynthesis
4. Insectivorous	(d) Autotroph
5. Cuscuta	(e) Stomata
6. Mango tree	(f) Saprotroph
7. Small openings	(g) Parasite
8. Carbon dioxide	(h) Rhizobium
9. Iodine	(i) Oxygen
10. Respiration	(j) Starch test

Answer:

Column I	Column II
1. Nitrogen	(h) Rhizobium
2. Fungi	(f) Saprotroph
3. Chlorophyll	(b) Green leaves
4. Insectivorous	(a) Pitcher plant
5. Cuscuta	(g) Parasite
6. Mango tree	(d) Autotroph
7. Small openings	(e) Stomata
8. Carbon dioxide	(c) Photosynthesis
9. Iodine	(j) Starch test
10. Respiration	(i) Oxygen

 

Very Short Answer Type Questions 

Question 1. 
Why nutrients are important for an organism?
Answer: 
The nutrients enable living organisms to build their bodies, grow, repair damaged parts of their bodies, and provide the energy to carry out life processes.

Question 2. 
Carbohydrates produced during photosynthesis get converted into complex forms. Name the complex form. 
Answer:
Carbohydrates get converted into starch.

Question 3. 
What are the tiny pores on the surface of the leaves surrounded by?
Answer: 
The tiny pores on the surface of leaves are surrounded by Gillard cells.

Question 4. 
Why algae are green in color? 
Answer: 
Algae are green in color because they contain chlorophyll, they can prepare their own food by photosynthesis.

Question 5. 
Where are the food factories of the plants located?
Answer: 
Leaves are the food factories of the plants.

Question 6. 
What are other components required by the plants to survive? (Other than carbohydrates)
Answer: 
The other components of food synthesized by plants are proteins and vitamins.

Question 7. 
What is the main component of protein?
Answer: 
Nitrogen is the main component of protein.

Question 8. 
Which gas is released during photosynthesis?
Answer: 
Oxygen (0₂) gas is released during photosynthesis. 

Question 9. 
What are total parasitic plants? 
Answer: 
Total parasitic plants are those which depend completely on the host plant for their food. For example - Dodder.

Question 10. 
Name a parasitic plant having the biggest flower?
Answer: 
Rafflesia parasitic plant, found in the forests of Malaysia, has the biggest and heaviest flower.

Question 11. 
Plants cannot use the nitrogen present in the soil directly. Why?
Answer: 
Plants can use nitrogen only insoluble form while in soil nitrogen is present in inorganic form

Short Answer Type Questions

Question 1. 
Name the various modes of nutrition.
Answer: 
Various modes of nutrition are :

1. Autotrophic nutrition
2. Heterotrophic nutrition
3. Saprotrophic nutrition
4. Parasitic nutrition

Question 2. 
Name the structures responsible for supplying water and food to various parts of the plants respectively.
Answer: 
Water and minerals are transported to the various parts of the plants by the vessels called xylem. Food is transported from leaves to all the parts of the plant by the structures called phloem.

Question 3. 
Where is the food stored in potato and ginger?
Answer: 
In potato and ginger plants, leaves are above the ground whereas, underground stems store food material. The leaves prepare food through photosynthesis and transport it to the underground parts for storage.

Question 4. 
Name some categories of hetero-trophic plants.
Answer: 
A few categories of heterotrophic plants are: 

1. Parasitic plants
2. Insectivorous plants
3. Symbiotic plants 
4. Saprotrophic plants

Question 5. 
Write the difference between parasite and host.
Answer: 
Difference between parasite and host:

Parasite	Host
The plant which derives nutrition from other living organisms is called a parasite. It grows inside the body of the host and derives its nutrition from it.	The organism which provides food and shelter to a parasite is called the host.

Question 6. 
What do you understand by the term symbiosis?
Answer: 
The association between two organisms in which they take mutual benefit from each other is called symbiosis. One organism provides shelter, and water while the other prepares food and provides food.

Question 7. 
How do fungi derive nourishment? 
Answer:
Bread mold, yeast, and mushroom are all fungi that derive their food from organic matter which aids in its extracellular digestion and converts it into soluble form then absorb it. This method of getting nutrition in the form of simple solute is known as saprophytic nutrition.

Question 8. 
Write the differences between algae and fungi?
Answer: 
Differences between algae and fungi:

Algae	Fungi
1. Algae possess chlorophyll for photosynthesis.	Fungi do not possess chlorophyll for photosynthesis.
2. Algae are autotrophic in nature.	Fungi are saprophytic in nature.
3. Most are aquatic.	Usually wild.

Question 9. 
What are lichens?
Answer: 
Lichens are the organisms in which an alga (a chlorophyll-containing partner) and a fungus live together. The fungus provides shelter, water, and minerals to the alga and in return, the alga prepares and provides food to the fungus.

Long Answer Type Questions

Question 1. 
Difference between autotrophic and heterotrophic modes of nutrition? 
Answer: 
Differences between them are as follows :

Autotrophic	Heterotrophic
The mode of nutrition in which organisms made food by themselves from simple substances is called autotrophic nutrition. (auto = self; trophos = nourishment)For example: Green plants.	The mode of nutrition in which organisms take in readymade food prepared by plants is called heterotrophic nutrition (heteros=otha,trophos nourishment) For example: Fungi, bacteria, animals.

Question 2. 
Explain the structure of the cell in detail. 
Answer: 
The bodies of living organisms are made up of tiny units called cells. The cell is enclosed by a thin outer boundary called the cell membrane. Most cells have a distinct centrally located spherical structure called the nucleus. The nucleus is surrounded by a jelly-like substance called cytoplasm.

Question 3. 
Why the Sun is considered the ultimate source of energy for all living organisms?
Answer: 
Solar energy is captured by the leaves and stored in plants in the form of food. Animals eat plants and use the same chemical energy for all their activities. On the death and decay of plants and animals, decomposers or saprotrophs use this energy for their growth. Hence, we can say, that sun is the ultimate source of energy.

Question 4. 
Explain the structure of stomata with the help of a diagram.
Answer: 
Stomata are small openings present on the surface of leaves. It helps the plants to respire. Carbon dioxide present in the air is taken in and the oxygen is released during photosynthesis through stomata. Openings and closings of stomata are controlled by the guard cells.

Structure of stomata

• Opening
• Closing

Question 5. 
What are parasitic plants?
Answer: 
Parasitic plants are those which obtain food from green plants (called hosts) for their nourishment since the plant derives some or all of its nutritional requirements from the host, it is called a parasite. For example - Cuscuta (Amabel)

Question 6. 
With the help of a diagram, explain the functioning mechanism of the pitcher plant? 
Answer: 
In a pitcher plant, the leaves are modified in the shape of the pitcher. The apex of the leaf forms a lid that can open and close the mouth of the pitcher. Inside the pitcher, there are hairs like structures that are directed downwards. When an insect lands in the pitcher, the lid closes and the trapped insect gets entangled in, the hair. The insects are digested by the digestive juices secreted in the pitcher. The pitcher plant is an insectivorous plant.

Question 7. 
Fungi are both friend and foe to humans were Comment. 
Answer: 
Fungi form a cotton-like yellowish-white mass on the foodstuffs, unused leather objects, etc. The fungi spores are present in the air and when they land on warm and moist food items, they grow very fast, spoil the food and cause many plants and animals diseases. On the other hand, some fungi like mushrooms are edible while some of the fungi are used for the production of antibiotics like penicillin. So we agree with the comment that fungi are both friend and foe to humans were

Question 8. 
Why do farmers add manures or fertilizers in the fields?
Answer: 
Plants absorb minerals and nutrients from the soil so their amounts in the soil keep on declining. Fertilizers and manures contain nutrients such as nitrogen, pota¬ssium, phosphorus, etc., these nutrients need to be added from time to time to enrich the soil. Hence, to replenish the nutrients and to keep plants healthy, farmers add manure or fertilizer to the soil.