Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Tschermak-Seysenegg, a rediscoverer of Mendel's work belonged to

  1. USA

  2. Spain

  3. Austria

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

Erich Tschermak was an Austrian agronomist who developed several new disease-resistant crops, including wheat-rye and oat hybrids. He independently rediscovered Gregor Mendel's work on genetics. He was a plant breeder, and his hybridization experiments were done with the idea of improving crops using the laws of heredity.

So, the correct option is ‘Austria’.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Hugo de Vries, a rediscoverer of Mendel's work belonged to

  1. Holland

  2. Austria

  3. Germany

  4. England.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hugo de Vries, Holland botanist and geneticist, is the author of the mutation theory of evolution. His work led to the rediscovery and establishment of Mendel's laws. He made his first notable contributions to science in the 1880s in the field of plant physiology.

So, the correct option is ‘Holland’.

Multiple choice biology mendel's law of inheritance experiments of mendel works of mendel mendel's laws of inheritance

Carl Correns, a rediscoverer of Mendel's work, was

  1. American

  2. German

  3. Austrian

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

Carl Erich Correns was a German botanist and geneticist, who is notable primarily for his independent discovery of the principles of heredity, and for his rediscovery of Gregor Mendel's earlier paper on that subject, which he achieved simultaneously but independently of the botanists Erich Tschermak von Seysenegg and Hugo de Vries, and the agronomist William Jasper Spillman.

So, the correct option is ‘German’.

Multiple choice biology chemical coordination and integration mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

Which of the following is NOT true about hormones?

  1. Hormones are secreted into the bloodstream.

  2. Hormones are released from exocrine glands.

  3. Hormones may be classified as peptides or steroids.

  4. Hormones usually affect a target organ.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hormones are the chemical substance, released from endocrine glands. They are directly released into the blood and affect the targeted organ. They may be the peptide such as insulin or steroid such as cortisol. Thus, the correct answer is option B.

Multiple choice biology chemical coordination and integration mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

Zoologists extracted the chemical that the Japanese beetle uses to attract a mate and use it in a trap to reduce the beetle population. They are utilizing a

  1. Hormone

  2. Pesticide

  3. Enzyme

  4. Pheromone
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A pheromone is a chemical released by one animal to affect the behaviour of another animal and thus it is used to trap the beetle to reduce their population.

Multiple choice biology chemical coordination and integration mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

A ................... mechanism regulates the action of the hormones.

  1. Feedback

  2. Regulating

  3. Synthesizing

  4. Control
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hormonal actions are regulated by two mechanisms: feedback and antagonistic effects of two hormones. A feedback mechanism can work as a negative or positive mechanism. The negative feedback mechanism is activated by surplus and proceeds to correct the process that caused the surplus. Therefore, increased the blood level of a certain hormone or its effect on target organ act to prevent its further release. For example, increased blood glucose level stimulates insulin secretion. The positive feedback mechanism of hormone regulation includes stimulation of release of the same hormone caused by its increased blood level. For example, the release of oxytocin is stimulated by uterine contraction during labor pain. 

Therefore, the correct answer is option A.

Multiple choice biology chemical coordination and integration mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

Which hormone stimulates the production of estrogen and progesterone?

  1. Growth hormone

  2. Antidiuretic hormone

  3. Gonadotropic hormones

  4. Thyroid-stimulating hormone
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gonadotropin is a hormone which stimulates production of sex hormones and development of secondary sexual characters.
Females : Ovaries : Oestrogen and Progesterone
Males : Testes (testicle) : Testosterone.

Multiple choice biology chemical coordination and integration mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

When the secretion of hormones is under the control of factors or hormones it is called as

  1. Homeostasis

  2. Feedback control

  3. Conjugation

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

When the secretion of hormone is controlled by the factors or other hormones it is called feedback control. For example, homeostasis means keeping the internal environment of the body constant. Hormones help in maintaining internal environment of the body. Thus, the correct answer is option B.

Multiple choice biology chemical coordination and integration mechanism of hormone action coordination in human beings- chemical control endocrine system in humans

When the output of a pathway inhibits inputs to the pathway. This condition is known as

  1. Positive feedback

  2. Negative feedback

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An increased amount of thyroxine in the blood exerts an inhibitory effect on the hypothalamus. in such a way that less of thyroid releasing hormone (TRH) and thyroid stimulating hormone (TSH) is produced respectively. This eventually results in a decrease in thyroxine. This is called negative feedback control.