Biology - Mock Test 345

Question 3441

N2 content is kept constant in the biosphere due to?

A) N2 fixation B) industrial pollution C) nitrogen cycle D) absorption of N2

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Question 3442

Placenta is the structure formed?

A) by the union of foetal and uterine tissue B) by foetus only C) by fusion of germ layers D) None of these

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Question 3443

Pyorrhoea is a disease of the?

A) nose B) gums C) heart D) lungs

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Question 3444

Primary phloem develops from?

A) lateral meristem B) protoderm C) extrastelar cambium D) provascular tissue

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Question 3445

Potato is a modified form (outgrowth) of?

A) root B) stem C) fruit D) leaf

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Question 3446

out of proteins, lipids and carbohydrates present in a cell membrane, what is true?

A) Lipids are maximum B) Carbohydrates are minimum C) Carbohydrates are maximum D) All three are in equal proportion

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Question 3447

Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by?

A) Robert Hooke B) Robert Brown C) Rudolf Virchow D) Theodore Schwann

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Question 3448

Plant development is influenced by?

A) quality of light only B) quality and quantity of light C) quality and duration of light D) quality, quantity and duration of light

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Question 3449

Plants absorb most part of water needed by them through their?

A) embryonic zone B) growing point C) root hairs D) zone of elongation

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Question 3450

Plants synthesis protein from?

A) starch B) sugar C) amino acids D) fatty acids

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