Tag: biology

Questions Related to biology

Jute fibre deteriorates quickly due to presence of

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

  1. High cellulose

  2. Low cellulose

  3. High lignin

  4. Low lignin

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Correct Option: C

The cotton thread fibres are

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

  1. Fibres taken out from stem

  2. Epidermal hairs of seeds

  3. Epidermal hairs of fruits

  4. Fibres taken out from roots

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Correct Option: B

Which of the following crop is most important for human

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

  1. Barley

  2. Wheat

  3. Cotton

  4. Millet

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Correct Option: B
Explanation:

Wheat is the most widely grown crop in the world and provides 20% of the daily protein and of the food calories for 4.5 billion people. It is the second most important food crop in the developing world after rice. The most planted crops throughout the world are wheat and maize (corn). 

So, the correct answer is 'Wheat'

Ground nut is native of

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

  1. Brazil

  2. India

  3. Japan

  4. Philippines

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Correct Option: A

Highest quantity of cellulose is found in

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

  1. Cotton

  2. Coir

  3. Hemp

  4. Flex

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Correct Option: A

The main function of prolactin hormone is to

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. Influence the activity of thyroid gland

  2. Control development of Graffian follicles

  3. Initiate and maintain secretion of milk by mammary gland

  4. Cause ejection of milk

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Correct Option: C
Explanation:

Prolactin, also called as luteotropic hormone (LTH) or luteotropin, is a protein hormone produced by the pituitary gland of mammals, that acts with other hormones to initiate secretion of milk by the mammary glands. 

Which of the following hormones stimulates the production of milk?

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. LH

  2. Prolactin

  3. Oxytocin

  4. Progesterone

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Correct Option: B
Explanation:

Prolactin is the hormone that stimulates milk production. During pregnancy, prolactin stimulates growth of the breast, but high estrogen and progesterone secretion prevent milk production. After delivery, estrogen and progesterone levels drop, and prolactin stimulates the secretion of milk by alveolar cells in the breast.

Some hormones check the milk from being secreted by the mammary glands till the birth of young ones even though the glands are all prepared to do so. They are

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. Progesteron and prolactin

  2. Prolactin and FSH

  3. Oestrogen and prolactin

  4. Oestrogen and progesteron

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Correct Option: A
Explanation:
Progesterone and prolactin check the milk from being secreted by the mammary glands till the birth of young ones even though the glands are all prepared to do so. Progesterone is a hormone released by the corpus luteum in the ovary. Changing progesterone levels can contribute to abnormal menstrual periods and menopausal symptoms. Prolactin is a hormone named originally after its function to promote milk production (lactation) in mammals in response to the suckling of young after birth. It has since been shown to have more than 300 functions in the body. These can be divided into a number of areas: reproductive, metabolic, regulation of fluids (osmoregulation), regulation of the immune system (immunoregulation) and behavioural functions.
At birth, prolactin levels remain high, while the delivery of the placenta results in a sudden drop in progesterone, oestrogen, and HPL levels.

Lemmings reduce their number by committing suicide every

biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

  1. Eight years

  2. Alternate years

  3. Four years

  4. Two years

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Correct Option: C
Explanation:

Lemmings reduce their number by committing suicide every 4 years. It has been regarded as a collective suicide, conscious or involuntary, caused by overpopulation. In reality, being solitary rodents by nature, when the population booms, the stronger lemmings drive the weaker and younger ones off long before the food is depleted.

Therefore, the correct answer is option (C).

The unit of natural selection is

biology selection and evolution ethology animal behaviour natural selection

  1. An individual

  2. A species

  3. A genus

  4. A population

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Correct Option: A