Tag: biology

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Multiple choice 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

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

  1. Mouth

  2. Esophagus

  3. Stomach

  4. Gall bladder

  5. Small intestine
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice 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

The chemical digestion of food starts in the

  1. Mouth

  2. Stomach

  3. Esophagus

  4. Small intestine

  5. Large intestine
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice 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

Carnivorous animals use these teeth to tear flesh.

  1. Incisors

  2. Canines

  3. Premolars

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

Multiple choice 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

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

  1. Pharynx

  2. Mouth

  3. Buccal cavity

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

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

A human female reaches menopause around the age of

  1. 50 years

  2. 17 years

  3. 70 years

  4. 25 years.
Reveal answer Fill a bubble to check yourself
A Correct answer
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'. 

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

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

  1. Follicular phase

  2. Ovulation phase

  3. Luteal phase

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

The follicular phase (also known as the proliferative phase) typically lasts from the end of menstruation until ovulation, spanning about 7 to 8 days or longer depending on cycle length. Other phases like ovulation are much shorter, and the luteal phase is generally fixed at 14 days.

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

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

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

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

Which of the following statements concerning menopause is correct?

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

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When an ovum is fertilized, the corpus luteum is maintained to produce progesterone, which prevents the shedding of the endometrium and thus stops the menstrual cycle. This is the primary biological reason for the cessation of menstruation during pregnancy.