Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

Multiple choice zoology natural resources and agriculture pollution of soil degradation of land damaging the forests

Taungya is practice of

  1. Shifting cultivation

  2. Agroforestry

  3. Production forestry

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Taungya is practice of shifting cultivation and agroforestry. If is a form of agroforestry system. In this, the villagers are given the right to cultivate short term crops during the early stages of forest plantation establishment. This is continued until trees shade crops due to canopy closure. This is done to utilize the land, control weeds, generate extra income.

Thus, the correct answer is 'Both A and B.'

Multiple choice zoology natural resources and agriculture pollution of soil degradation of land damaging the forests

An agroforestry, taungya consists of

  1. Growing crops in between rows of trees

  2. Growing crops after removal of trees

  3. Growing trees on degraded soils

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Taungya system is a form of agroforestry system in which short term crops are grown in the early years of the plantation of a woody perennials species in order to utilize the land, control weeds, reduce establishment costs, generate early income and stimulate the development of the woody perennial species.

So, the correct answer is 'Growing crops in between rows of trees'

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Androgens are secreted by 

  1. Pituitary

  2. Testes

  3. Ovaries

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

Androgens are a group of hormones, that primarily influence the growth and development of the male reproductive system. The predominant and most active androgen is testosterone, which is produced by the male testes. The other androgens, which support the functions of testosterone, are produced mainly by the adrenal cortex, the outer portion of the adrenal glands and only in relatively small quantities.

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Which hormone is produced by placenta?

  1. GH

  2. Gastrin

  3. ACTH

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

The placenta connects the developing foetus to the wall of the mother’s uterus during pregnancy.

The placenta produces two steroid hormones - oestrogen and progesterone. Progesterone acts to maintain pregnancy by supporting the lining of the uterus which provides the environment for the foetus and the placenta to grow. It prevents the shedding of this lining which would result in pregnancy loss. It also suppresses the uterine wall’s ability to contract, which is important in preventing labour from occurring before the end of pregnancy. Hence option D is correct.

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

If a human female starts developing male characteristics like beard, degeneration of uterus and ovaries, enlargement of clitoris etc. It may be due to

  1. Over production oestrogen and testosterone

  2. Damage to posterior pituitary

  3. Over production of adrenal androgens

  4. Surgical removal of mammary gland
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Excess amounts of androgens result in acne, hirsutism (excess hair growth on the chin or upper lip) and thinning hair. Many women with high levels of a form of testosterone have polycystic ovary syndrome (PCOS), infertility, blood sugar disorders. High levels of androgens are associated with insulin resistance and diabetes, high cholesterol, high blood pressure and heart disease.

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

A decrease in the level of estrogen-progesterone causes

  1. Growth and dilation of myometrium

  2. Growth of endometrium

  3. Constriction of uterine blood vessels leading to shedding of endometrium or uterine epithelium

  4. Release of ovum from the ovary
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Menstruation is the shedding of the lining of the uterus (endometrium) accompanied by bleeding. Bleeding occurs after oestrogen and progesterone levels decrease at the end of the previous cycle. This decrease causes the top layers of thickened lining of the uterus (endometrium) to break down and be shed. 

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Which one of the following statements about sex hormones is correct?

  1. Testosterone is produced by Leydig cells under the influence of luteinizing hormone (LH).

  2. Progesterone is secreted by corpus luteum and soften ligaments during child birth.

  3. Estrogen is secreted by both Sertoli cells and corpus luteum.

  4. The progesterone produced by corpus luteum is biologically different from the one produced by placenta.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the male, luteinizing hormone promotes the development of the interstitial tissue (Leydig cells) of the testes and hence promotes the secretion of the male sex hormone, testosterone. 

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Which one affects liver, muscle and adipose tissue?

  1. Androgen

  2. Insulin

  3. Progesterone

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

Insulin helps control blood glucose levels by signaling the liver and muscle and fat cells to take in glucose from the blood. Insulin therefore helps cells to take in glucose to be used for energy.

Multiple choice zoology control and coordination in living organisms control of blood glucose endocrine system and hormone hormones in human reproduction testes and ovary parts of the brain kidney

Hormone responsible for the implantation of embryo in uterus and formation of placenta is

  1. Adrenaline

  2. Progesterone

  3. Estradiol

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

Progesterone is a hormone secreted by ovaries. It maintains the lining of the uterus during the middle part of the menstrual cycle and during pregnancy. If a pregnancy occurs, progesterone is produced in the placenta, and levels remain elevated throughout the pregnancy. One of the progesterone's most important functions is to cause the endometrium to secrete special proteins during the second half of the menstrual cycle, preparing it to receive and nourish an implanted fertilized egg. If implantation does not occur, estrogen and progesterone levels drop, the endometrium breaks down and menstruation occurs.