Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

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

Jute fibre deteriorates quickly due to presence of

  1. High cellulose

  2. Low cellulose

  3. High lignin

  4. Low lignin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Jute fiber is a lignocellulosic fiber. High lignin content makes the fiber more resistant to degradation, but in the context of commercial processing and quality, high lignin content is often associated with lower flexibility and faster deterioration under certain environmental conditions compared to pure cellulose fibers.

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

The cotton thread fibres are

  1. Fibres taken out from stem

  2. Epidermal hairs of seeds

  3. Epidermal hairs of fruits

  4. Fibres taken out from roots
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cotton fibers are single-celled, elongated structures that grow from the surface of the seeds of the cotton plant. They are botanically classified as epidermal hairs.

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

Which of the following crop is most important for human

  1. Barley

  2. Wheat

  3. Cotton

  4. Millet
Reveal answer Fill a bubble to check yourself
B Correct answer
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'

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

The main function of prolactin hormone is to

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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. 

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

Which of the following hormones stimulates the production of milk?

  1. LH

  2. Prolactin

  3. Oxytocin

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

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

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

  1. Progesteron and prolactin

  2. Prolactin and FSH

  3. Oestrogen and prolactin

  4. Oestrogen and progesteron
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice biology animal behaviour ethology natural selection coordination in human beings- chemical control endocrine system in humans

Lemmings reduce their number by committing suicide every

  1. Eight years

  2. Alternate years

  3. Four years

  4. Two years
Reveal answer Fill a bubble to check yourself
C Correct answer
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).