Tag: the life cycle of animals

Questions Related to the life cycle of animals

A mixture containing DNA fragments a, b, c and d with molecular weights of a+b = c, a > b and d > c, was subjected to agarose gel electrophoresis. The movement of these fragments from cathode to anode sides of the gel would be

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Smaller molecules move faster

  2. Both smaller and larger will move at same pace

  3. Larger will move faster

  4. None of these

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Correct Option: A
Explanation:
  • In Agarose gel electrophoresis we separate macromolecules like DNA, RNA and protein on the basis of their molecular size and charge.
  • In this Shorter molecules move faster and migrate farther than longer ones because shorter molecules migrate more easily through the pores of the gel. 
  • DNA migrate towards anode.

Cowper's glands are found in-

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Male mammals.

  2. Female mammals.

  3. Male amphibians.

  4. Female amphibians.

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Correct Option: A

Parthenogenesis is the development of an organism directly from : 

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Female gametes

  2. Vegetative cells

  3. Fertilized ovum

  4. None of these

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Correct Option: D

In which organism female is XO and Male is XX?

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Bed bug

  2. Grasshopper

  3. Fumia

  4. Sparrow

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Correct Option: A

Read the following statements(A-E) and answer as asked
$(1)$ In Equisetum the female gametophyte is retained on the parent sporophyte
$(2)$ In Ginkgo male gametophyte is not independent.
$(3)$ The sporophyte in Riccia is more developed than that in Polytrichum
$(4)$ Sexual reproduction in Volvox is isogamous
$(5)$ The spores of slime moulds lack cell walls
How many of the given statements are correct?

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Two

  2. Three

  3. Four

  4. One

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Correct Option: A

What type of fertilisation takes place in the following?

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Cow

  2. Frog

  3. Human

  4. Fish

  5. Hen

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Correct Option: A

Which of the following is correct mode of reproduction?

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Budding in Yeast

  2. Fragmentation in spongilla

  3. Zoospore in Amoeba

  4. Binary fission in Hydra

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Correct Option: A
Explanation:
  • Yeasts are fungi that grow as single cells, producing daughter cells either by budding (the budding yeasts) or by binary fission (the fission yeasts)
  • A small bud which will become the daughter cell is formed on the parent (mother) cell and enlarges with continued growth. As the daughter cell grows, the mother cell duplicates and then segregates its DNA. The nucleus divides and migrates into the daughter cell.
  • Hence Budding in Yeast is the correct mode of reproduction.
  • So, the correct answer is 'Budding in Yeast'.

In flatsworms,fertillisation occurs in the 

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Surrounding water

  2. Female genital tract

  3. Male genital tract

  4. specialised flame cells

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Correct Option: D

A living organism is unexceptionalty differentiated from a nonliving structure on the basis of

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. reproduction

  2. growth and movement

  3. interaction with environment

  4. responsiveness.

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Correct Option: A

Cry gene which synthesize crystal protein is isolated from

biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

  1. Bacillus thuringiensis

  2. Rhizobium

  3. Bacillus polymyxa

  4. Clostridium

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Correct Option: A
Explanation:

Bacillus thuringiensis (Bt) is a Gram-positive bacterium that produces crystals during sporulation. These crystals comprise ~130 kDa protoxins called crystal proteins which are potent and highly specific insecticides. Once ingested by specific host, these crystals dissolve in the alkaline conditions of the gut thereby activating the protoxins. The active toxins then bind to receptors on midgut epithelial cells, become inserted into the plasma membrane where they form pores leading to cell death through osmotic lysis. Option A is the correct answer.