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Q:

Yellow fever is mainly transmitted among humans by

A) Female mosquito bite B) Male mosquito bite
C) Water D) Air
 
Answer & Explanation Answer: A) Female mosquito bite

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Q:

Which of the following statements is true?

A) In grasshoppers and some insects, the male has only four sex chromosomes B) A male individual contains one X and two Y chromosomes
C) In human beings, there are 46 chromosomes, of which 42 (21 pairs) are autosomes D) In diploid organisms having separate sexes, a specific pair of chromosomes in each diploid cell determines the sex of the individual, they are called sex chromosomes.  
 
Answer & Explanation Answer: D) In diploid organisms having separate sexes, a specific pair of chromosomes in each diploid cell determines the sex of the individual, they are called sex chromosomes.  

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Q:

Phytohormones are

A) substances controlling diseases B) regulators synthesized by plants influencing physiological processes
C) substances used for photosynthesis D) chemicals used for peeling
 
Answer & Explanation Answer: C) substances used for photosynthesis

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Q:

_____ is a part of the male reproductive system in plants.

A) Stamen B) Stigma
C) Ovary D) Style
 
Answer & Explanation Answer: A) Stamen

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Q:

Which type of reproduction allows for greater variation to be generated?

A) Sexual reproduction B) Asexual reproduction
C) Binary fission D) Multiple fission
 
Answer & Explanation Answer: A) Sexual reproduction

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Q:

Growth hormones function

A) sometimes as growth promotors and sometimes as growth inhibitors B) always as growth inhibitors
C) rarely as growth promotors D) always as growth promotors
 
Answer & Explanation Answer: A) sometimes as growth promotors and sometimes as growth inhibitors

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