Tag: how do animals reproduce?

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

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

  1. Smaller molecules move faster

  2. Both smaller and larger will move at same pace

  3. Larger will move faster

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

Cowper's glands are found in-

  1. Male mammals.

  2. Female mammals.

  3. Male amphibians.

  4. Female amphibians.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cowper's glands (also known as bulbourethral glands) are a pair of exocrine glands in the male reproductive system of many mammals, which secrete a fluid that neutralizes acidity in the urethra.

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

Parthenogenesis is the development of an organism directly from : 

  1. Female gametes

  2. Vegetative cells

  3. Fertilized ovum

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Parthenogenesis is a form of asexual reproduction where an embryo develops from an unfertilized egg cell. Since none of the specific options (female gametes, vegetative cells, fertilized ovum) accurately describe the process of development from an unfertilized egg, 'None of these' is correct.

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

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?

  1. Two

  2. Three

  3. Four

  4. One
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

Which of the following is correct mode of reproduction?

  1. Budding in Yeast

  2. Fragmentation in spongilla

  3. Zoospore in Amoeba

  4. Binary fission in Hydra
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology the life cycle of animals how do animals reproduce? excretory, nervous and reproductive system structure and functions of living organisms -ii

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

  1. reproduction

  2. growth and movement

  3. interaction with environment

  4. responsiveness.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Reproduction is often considered the defining characteristic that distinguishes living organisms from non-living structures, as non-living things do not reproduce to create copies of themselves.

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

Cry gene which synthesize crystal protein is isolated from

  1. Bacillus thuringiensis

  2. Rhizobium

  3. Bacillus polymyxa

  4. Clostridium
Reveal answer Fill a bubble to check yourself
A Correct answer
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.