Biology Questions

Q:

How many pairs of ribs are there in human body?

A) 10 B) 11
C) 12 D) 13
 
Answer & Explanation Answer: C) 12

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Q:

Sponges belongs to the phylum

A) Protozoa B) Annelida
C) Porifera D) Cnidaria
 
Answer & Explanation Answer: C) Porifera

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Q:

Steroid hormones exert their action by

A) entering the cell and activating mitichondrial DNA B) binding cell receptors
C) activating hypothalmic release of regulating hormones D) entering the nucleus of a cell and initiating or altering the expression of a gene
 
Answer & Explanation Answer: D) entering the nucleus of a cell and initiating or altering the expression of a gene

Explanation:

Steroid hormones exert their action by entering the nucleus of a cell and initiating or altering the expression of a gene.

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Q:

What is the name of the hormone produced by thymus gland?

A) Thyroxine B) Auxins
C) Cytokinins D) Thymosin
 
Answer & Explanation Answer: D) Thymosin

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Q:

Which of the following plays an important role in photosynthesis?

A) Chloroplast B) Centrosome
C) Tonoplast D) Nematoblast
 
Answer & Explanation Answer: A) Chloroplast

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Q:

Which of the following increases the rate of heart beat?

A) Peripheral nerves B) Sympathetic nerves
C) Parasympathetic nerves D) Cranial nerves
 
Answer & Explanation Answer: B) Sympathetic nerves

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Q:

Presence of large amounts of nutrients in waters also causes excessive growth of _________ algae.

A) Biomagnification B) Algal bloom
C) planktonic D) Eutrophication
 
Answer & Explanation Answer: C) planktonic

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Q:

Sexual reproduction in Algae that takes place through fusion of two dissimilar size gametes is called?

A) Zoospores B) Anisogamous
C) Isogamous D) Oogamous
 
Answer & Explanation Answer: B) Anisogamous

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