Question of Exercise 7

The Living World of Class 11

Question
Which kingdom is mismatched?

Answer

Option 1 Fungi - Usually saprotrophic

Option 2 Plantae - Usually photosynthetic

Option 3 Animalia - Rarely ingestive

Option 4 Protista - Various modes of nutrition

Frequently Asked Questions

Free-living nitrogen fixing aerobic bacterium is

A: Rhodospirillum

B: Anabaena

C: Nostoc

D: Beijerinckia

E: Rhizobium

Solution:

Explanation

  • The free-living nitrogen-fixing aerobic bacterium is Beijerinckia. It is free-living and can fix nitrogen under aerobic conditions, with the help of the nitrogenase enzyme. 
  • The nitrogen-fixing bacteria are mostly prokaryotic which can use atmospheric nitrogen and change it into usable forms like ammonia, nitrates, and nitrites. 
  • Rhodospirillum is a facultative anaerobe, thus, depending upon the availability of oxygen, it can either undergo aerobic respiration or alcoholic fermentation. 
  • Anabaena is a filamentous bacterium (cyanobacteria), which is free-living or forms a symbiotic association with Azolla (water fern) and has heterocyst cells for nitrogen fixation.
  • Nostoc is unicellular cyanobacteria that are found either free-living or live in symbiotic association; for example, coralloid roots of cycas contain symbiotic cyanobacteria Nostoc.
  • Rhizobium is a nitrogen-fixing bacteria, commonly found in the root nodules of leguminous plants and fixes nitrogen under anaerobic conditions. 

Final Answer

Hence, the correct option is D i.e., Beijerinckia

In Mirabilis the roots are

A: Tuberous

B: Conical

C: Epiphytic

D: Nodulose

Solution:

Explanation

  • In Mirabilis the roots are tuberous. Tuberous roots are large, thick, and fleshy, with no definite shape, specialized for storing food.
  • So, tuberous roots are thickened secondary roots formed near the base of the root and are common in the plants like dahlia, and sweet potatoes including Mirabilis. 
  • Conical roots, as the same suggests are conical shaped, stores food e.g., carrot, these are widest at the top and gradually tapers towards the bottom part. Thus, option B is incorrect.
  • Epiphytic plants or the epiphytes are the plants that grow on another plant for support only, and are sometimes termed “air plants”. Epiphytes possess epiphytic roots e.g. Orchids.
  • Nodulose roots, for example in ginger, are swollen at the apex part, because of the accumulation of food. 

Final Answer

Hence, the correct answer is A (Tuberous roots).

Sonora - 64 and Lerma Rojo - 64 were brought to India from Mexico and modified through

A: UV rays

B: X rays

C: beta rays

D: gamma rays

Solution:

Explanation: 

  • Sonora - 64 and Lerma Rojo - 64 are mutant dwarf varieties of wheat that were developed in Mexico and later are modified through gamma rays to produce a beneficial mutant.
  • These varieties are high-yielding and also have other benefits such as resistance to diseases and lodging.

Final Answer: Hence, the correct answer is (D) gamma rays.

 

Water containing cavities in vascular bundles are found in

A: Sunflower

B: Maize

C: Cycas

D: Pinus

Solution:

Explanation:

Water containing cavities are formed by the disintegration of parenchyma and inner protoxylem vessels.

These cavities are known as lysigenous cavities.

They are only present in monocot plants.

Sunflower is a dicot plant, so it does not have lysigenous cavities.

Maize is a monocot plant, so it does not have lysigenous cavities.

Cycas has two cotyledons but it is not considered a dicot.It also does not have lysigenous cavities.

Pinus are also neither monocots nor dicots. 

Final answer:

The correct answer is maize, i.e option (B).

What is cladode

Solution:

Explanation:

Cladodes are also known as phylloclades.

They arise as a green, flattened structure from the stem.

They are the aerial modifications of the stem.

They are photosynthetic in nature and function as leaves.

They have a single internode.

Final answer:

Hence, this is the definition of cladode. 

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