Tag: biology

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Questions Related to biology

Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

The active chemical drug reserpine is obtained from 

  1. Datura

  2. Rauwolfia

  3. Atropa

  4. Papaver
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Reserpine (also known by trade names Raudixin, Serpalan, Serpasil) is an indole alkaloid, antipsychotic, and antihypertensive drug that has been used for the control of high blood pressure and for the relief of psychotic symptoms, although because of the development of better drugs for these purposes and because of its numerous side-effects, it is rarely used today. The antihypertensive actions of reserpine are a result of its ability to deplete catecholamines (among other monoamine neurotransmitters) from peripheral sympathetic nerve endings. These substances are normally involved in controlling heart rate, force of cardiac contraction and peripheral vascular resistance. Reserpine-mediated depletion of monoamine neurotransmitters in the synapses is often cited as evidence to the theory that depletion of the monoamine neurotransmitters causes subsequent depression in humans (c.f. monoamine hypothesis). However, this claim is not without controversy. The reserpine-induced depression is considered by some researchers to be a myth, while others claim that teas made out of the plant roots containing reserpine have a calming, sedative action that can actually be considered antidepressant. Notably, reserpine was the first compound shown to be an effective antidepressant in a randomized placebo-controlled trial. Reserpine was isolated in 1952 from the dried root of Rauwolfia serpentina.
So the correct option is 'Rauwolfia'.
Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

Which of the following groups of characteristics is applicable to the timber obtained from Sal(Shorea)?

  1. Strong, durable, moderately heavy, takes good polish

  2. Strong, durable, heavy, does not take good polish

  3. Strong, durable, heavy. takes good polish

  4. Not strong, durable if not exposed, light, does not take good polish
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sal (Shorea robusta) timber is known for being strong, durable, heavy, and taking a good polish.

Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

Match List I with List II and select the correct answer using the codes below the lists:

List-I(Timber) List-II(Country)
A. Cedar 1. Myanmar
B. Douglas Fir 2. Canada
C. Mahogany 3. Mexico
D. Teak 4. Honduras

  1. A - 2, B - 3, C - 4, D - 1

  2. A - 3, B - 2, C - 4, D - 1

  3. A - 3, B - 2, C - 1, D - 4

  4. A - 2, B - 3, C - 1, D - 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
 Cedar  Mexico
 Douglas Fir  Canada
 Mahogany  Honduras
 Teak  Myanmar

So, the correct option is 'A - 3, B - 2, C - 4, D - 1'.

Multiple choice biology plants in daily life uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

The Botanical name of ''indian rai''

  1. Brassica campestris

  2. B. juncea

  3. B. nigra

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

Brassica juncea, commonly known as Indian Rye or Indian mustard is a species of a mustard plant. Brassica species flowers are complete, bisexual, i.e., with functional male (androecium) and female (gynoecium), including stamens, carpels and ovary. Pollination is entomophilous i.e., by insects, or cleistogamy i.e., by self or allogamy i.e., by cross-pollination. 

So, the correct answer is 'B.juncea'