Tag: biology

Questions Related to biology

From which part of the alimentary canal does chemical digestion begins?

biology through the alimentary canal nutrition and its types types of nutrition in plants different modes of nutrition in plants digestive system - organs process of digestion coordination in the process of digestion

  1. Mouth

  2. Esophagus

  3. Stomach

  4. Gall bladder

  5. Small intestine

Show answer
Correct Option: A
Explanation:

Chemical digestion involves enzymes. In the mouth, chemical digestion is initiated when the food comes in contact with saliva, which is secreted by salivary glands. It contains salivary amylase which begins the digestive process by breaking down starch and converting it into maltose. Chemical digestion then further continues in stomach and then finally in the small intestine.

So, option A is the correct answer.

The chemical digestion of food starts in the

biology through the alimentary canal nutrition and its types types of nutrition in plants different modes of nutrition in plants digestive system - organs process of digestion coordination in the process of digestion

  1. Mouth

  2. Stomach

  3. Esophagus

  4. Small intestine

  5. Large intestine

Show answer
Correct Option: A
Explanation:

Chemical digestion food starts in the mouth as saliva is secrets from salivary gland which consists salivary amylase enzyme which acts on starch and converts it into the simpler form the churned food particles with saliva is called as the bolus then transferred to the stomach through the esophagus.

Carnivorous animals use these teeth to tear flesh.

biology through the alimentary canal nutrition and its types types of nutrition in plants different modes of nutrition in plants digestive system - organs process of digestion coordination in the process of digestion

  1. Incisors

  2. Canines

  3. Premolars

  4. Molars

Show answer
Correct Option: B
Explanation:

Carnivorous animals are meat eating animals. They use canines which are long, pointed teeth near the front of their jaw for tearing of flesh. Other teeth along the side of their jaw, molars and premolars, have uneven edges and are used for shearing the food in smaller pieces.

So, option B is the correct answer.

Pick out the odd one: among the parts of the alimentary canal are

biology through the alimentary canal nutrition and its types types of nutrition in plants different modes of nutrition in plants digestive system - organs process of digestion coordination in the process of digestion

  1. Pharynx

  2. Mouth

  3. Buccal cavity

  4. Pancreas

Show answer
Correct Option: D
Explanation:

Pancreas helps in digestion by secreting pancreatic juice in small intestine. However pancreas is a gland and is not a part of alimentary canal. Alimentary canal is a muscular tube which extends from mouth to anus and includes the mouth, pharynx, oesophagus, stomach and the intestines.

So, option D is the correct answer.

A human female reaches menopause around the age of

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. 50 years

  2. 17 years

  3. 70 years

  4. 25 years.

Show answer
Correct Option: A
Explanation:

Menopause marks the end of a woman's fertility and the cease of the menstrual cycle. The ovaries stop producing hormones and in humans, the menstrual cycle ceases at around 50 years of age. 

So, the correct answer is '50 years'. 

The phase of menstrual cycle in humans that last for 7-8 days, is

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Follicular phase

  2. Ovulation phase

  3. Luteal phase

  4. Menstruation

Show answer
Correct Option: A

During proliferative phase uterine wall undergoes certain changes, these are _________________.

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Myometrium wall is sloughed off

  2. Endometrium wall is sloughed off

  3. Blood vessels in endometrium become long and coiled

  4. Proliferation of myometrial epithelial lining

Show answer
Correct Option: C
Explanation:

During the proliferative phase, the endometrium of the uterus becomes thicker as blood vessels become long and coiled.

So, the correct answer is C.

Which of the following statements concerning menopause is correct?

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Menopause occurs because all of the female's follicles become hormone-producing corpus luteum at once

  2. Menopausal symptoms are a result of decrease in the production of FSH and LH

  3. The onset of menopause is primarily due to follicle atresia

  4. All of these

Show answer
Correct Option: C
Explanation:

Follicular atresia means degeneration of follicles. Thus, if all follicles get degenerated at the age of 45-50 years, there will be no ovulation and hence no menstruation which leads to menopause.

Cessation of menstrual cycle in a woman is called ___________.

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Lactation

  2. Ovulation

  3. Menopause

  4. Parturition

Show answer
Correct Option: C
Explanation:

Menopause is a phase occurring between the age of 45 to 55 years In a woman's life when ovulation and menstruation stop.

So, The correct answer is C.

A woman who is not having a menstrual cycle, which one of the following is the most likely root cause of this?

biology the age of adolescence menstruation in females changes at puberty what happens if an egg is not fertilized?

  1. Maintenance of the hypertrophical endometrial lining

  2. Maintenance of high concentration of sex-hormones in the blood stream

  3. Retention of well-developed corpus luteum

  4. Fertilisation of the ovum

Show answer
Correct Option: D