Tag: structure and functions of living organisms -ii

Questions Related to 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?

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

Show answer
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.

Animals having both the sexes in one body are called __________.

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

  1. Nematods

  2. Hermaphrodite

  3. Parasite

  4. Pseudocoelomate

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Correct Option: B
Explanation:

Certain animals like earthworm have both the sexes i.e., male and female reproductive system in one body itself. Such organisms are called as hermaphrodite. They tend to reproduce sexual by copulating.

HeLa cells used in cell biology are 

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

  1. Cancerous cells grown in cancer research laboratory

  2. Cervical cancer cell derivatives

  3. Both (A) and (B)

  4. None of the above

Show answer
Correct Option: C
Explanation:

HeLa cells, are cancerous cells  belonging to a cultured strain isolated from a patient suffering from cervical cancer. The designation HeLa is derived from the name of the patient, Henrietta Lacks. This cell line has been extensively used in cell biology research like cancers, effect of various carcinogens and xenobiotics on human cells etc. 

So.option C is correct.

Which animal exhibits sexual dimorphism ______________.

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

  1. Lobosa

  2. Ciliata

  3. Sporozoans

  4. Radiolarians

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Correct Option: A

The type of blastula formed in birds is 

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

  1. Teloblastula

  2. Holoblastula

  3. Coeloblastula

  4. Discoblastula

Show answer
Correct Option: D
Explanation:

Discoblastula is disc shaped blastula which is formed by meroblastic discoidal cleavage as in fishes, reptiles, birds and egg laying mammals.