Tag: zoology

Questions Related to zoology

Mine spoil is

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

  1. Wastes from mines

  2. Wastes from mine processing

  3. Land degraded by mining

  4. Both A and B

Show answer
Correct Option: C
Explanation:
A spoil tip is a pile built of accumulated spoil – the overburden or other waste rock removed during coal and ore mining.
So, the correct answer is 'land degraded by mining'

Taungya is practice of

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

  1. Shifting cultivation

  2. Agroforestry

  3. Production forestry

  4. Both A and B

Show answer
Correct Option: D
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.'

An agroforestry, taungya consists of

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

  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

Show answer
Correct Option: A
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'

Androgens are secreted by 

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

  1. Pituitary

  2. Testes

  3. Ovaries

  4. Thyroid

Show answer
Correct Option: B
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.

Which hormone is produced by placenta?

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

  1. GH

  2. Gastrin

  3. ACTH

  4. Progesterone

Show answer
Correct Option: D
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.

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

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

  1. Over production oestrogen and testosterone

  2. Damage to posterior pituitary

  3. Over production of adrenal androgens

  4. Surgical removal of mammary gland

Show answer
Correct Option: C
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.

A decrease in the level of estrogen-progesterone causes

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

  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

Show answer
Correct Option: C
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. 

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

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

  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.

Show answer
Correct Option: A
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. 

Which one affects liver, muscle and adipose tissue?

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

  1. Androgen

  2. Insulin

  3. Progesterone

  4. Glucagon

Show answer
Correct Option: B
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.

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

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

  1. Adrenaline

  2. Progesterone

  3. Estradiol

  4. FSH

Show answer
Correct Option: B
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.