Tag: structure and functions of living organisms -ii

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Questions Related to structure and functions of living organisms -ii

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
D Correct answer
Explanation

Let us evaluate the statements: (1) In Equisetum, spores give rise to independent free-living gametophytes (false). (2) In Ginkgo, male gametophytes develop within pollen grains and are not independent (true). (3) The sporophyte of Riccia is very simple and less developed than that of Polytrichum (false). (4) Sexual reproduction in Volvox is oogamous, not isogamous (false). (5) Spores of slime moulds possess true cell walls (false). Thus, only one statement 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

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.

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

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

  1. Nematods

  2. Hermaphrodite

  3. Parasite

  4. Pseudocoelomate
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

HeLa cells used in cell biology are 

  1. Cancerous cells grown in cancer research laboratory

  2. Cervical cancer cell derivatives

  3. Both (A) and (B)

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.