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Match the following columns and select the correct option.

Column I Column II
(a) gregarnious polyphagus pest (i) Asterias
(b) Adult with the radial symmetry and larva with bilateral symmetry (ii) Scorpion
(c) Book lungs (iii) Ctenoplanes
(d) Boioluminesces (iv) Locust


Option: 1

(a) (b) (c) (d)
i iii ii iv


Option: 2

(a)    (b) (c) (d)
iv   i  ii  iii

 
Option: 3

(a) (b) (c) (d)
iii ii i iv


Option: 4

(a) (b) (c) (d)
ii i iii iv

 

a. gregarious polyphagous pest - Locust

b. Adult with the radial symmetry and larva with bilateral symmetry - Asterias

c. Book lungs - Scorpion

d. Boioluminesces - Ctenoplanes

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Posted by

Ritika Jonwal

Which of the following pairs is of unicellular algae ?
Option: 1 Laminaria and Sargassum
Option: 2 Gelidium and Gracilaria
Option: 3 Anabaena and Volvox
Option: 4 Chlorella and spirulina  

Chlorella and spirulina are examples of unicellular algae.

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Posted by

Ritika Jonwal

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Match the following columns and select the correct option.               

Column I                                  Column II  

(a)  6- 15 pairs of gill slits                   (i) Trygon

 (b) Heterccercal caudal fin                  (ii) Cyclostones

(c) Air Bladder                                       (iii) Chondrichthyes

(d) Poison sting                                    (iv) Osteichthyes        
 

Option: 1    (a)         (b)           (c)           (d)
                     (ii)          (iii)          (iv)          (iv)
 Option: 2 (a)         (b)           (c)           (d)
                   (iii)          (iv)          (i)            (ii)
Option: 3  (a)         (b)           (c)           (d)
                   (iv)         (ii)           (iii)          (I)  
Option: 4 (a)         (b)           (c)           (d)
                  (i)           (iv)         (iii)           (ii)  

6-15 gill slits are found in Cyclostomata which is given only in option 1.

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Ritika Jonwal

Strobili or cones are found in :  
Option: 1 Salvinia
 
Option: 2 Pteris
 
Option: 3 Marchantia
 
Option: 4 Equisetum

Strobili or cones are found in Equisetum. hence, the correct option is (d).

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Ritika Jonwal

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Bilaterally symmetrical and acoelomate animals are exemplified by  
Option: 1 Ctenophora
 
Option: 2 Platyhelminthes
 
Option: 3 Aschelminthes
 
Option: 4 Annelida

Bilaterally symmetrical and acoelomate animals are exemplified by platyhelminthes.

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Ritika Jonwal

Floridian starch has a structure similar to
Option: 1 Starch and cellulose
 
Option: 2 Amylopectin and glycogen
 
Option: 3 Mannitol and algin
 
Option: 4 Laminarin and cellulose

In Rhodophyta, the reserve food is Floridean Starch which is similar to amylopectin and glycogen.

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Ritika Jonwal

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Why do we keep both snake and turtle in the same class?

Snake and turtle both belong to the class- Reptilia. They have common characteristic features which are as under-

  • They are cold-blooded animals.
  • They have skin without glands.
  • They have scales present on their body.
  • They respire with the help of lungs.
  • They have a three-chambered heart
  • Both of them are oviparous i.e., eggs laying animals.
  • They have hard shelled eggs and they need not to lay them in water

 

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infoexpert21

List out some common features in cat, rat and bat.

Cat, rat and bat belong to the class Mammalia. The common characteristic features between them are as under-

  • All of them are multicellular and have nucleus present in their cells.
  • Their mode of nutrition is heterotrophic in nature.
  • All have notochord present in them.
  • The presence of four-chambered heart in them.
  • They have a dorsal nerve cord.
  • All are triploblastic in nature.
  • They are coelomate.
  • They are viviparous i.e. give birth to the offsprings and have mammary glands present to feed their offsprings.

 

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Differentiate between flying lizard and bird. Draw the diagram.

 

 

Flying lizard

 

Birds

 

It belongs to class reptilia.

 

It belongs to class aves.

 

They are cold-blooded animals.

 

They are warm-blooded animals.

 

Their body is covered by dry and rough scales.

 

Their body is covered by feathers.

 

They have two pairs of  limbs.

 

The forelimbs are modified into wings.

 

Their heart has two auricles and one partially separated ventricle.

 

They have completely four chambered heart.

 

Jaws and teeth are present.

 

Jaws and teeth are replaced by horny beak.

 

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infoexpert21

Which organism is more complex and evolved among Bacteria, Mushroom and Mango tree. Give reasons.

Bacteria is a unicellular organism while as mushroom and mango tree are multicellular.

 But Mango tree is more complex and evolved organism amongst all because it is eukaryotic, multicellular, autotrophic plant found on the land. It belongs to the class angiosperm and its seeds are present within the fruit. It produces flowers and the reproductive organs are present in it.

While as bacteria is a prokaryotic unicellular organism and mushrooms belong to the class fungi and are heterotrophic thallophytes without any differentiation of stem leaves and roots, vascular tissues and embryonic stage is absent.

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infoexpert21

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