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Q:

Select the four statements about Plasmodium that are true.

A) Inside an infected mosquito, haploid gametes fuse, forming a diploid zygote that develops into an oocyst

B) Plasmodium cells infect two specific types of cells in humans.

C) Inside an infected mosquito, haploid gametes fuse, forming a haploid zygote that develops into an oocyst.

D) When a mosquito bites a human with malaria, diploid Plasmodium cells enter the mosquito.

E) Plasmodium cells are transferred to humans through mosquito saliva.

F) The life cycle of Plasmodium involves only haploid forms.

G) The complete life cycle of Plasmodium requires two hosts.

A) A, B, E, G	B) A, C, F, G
C) B, C, D, F	D) None of the above

Answer & Explanation Answer: A) A, B, E, G

Explanation:

Plasmodium is a genus of unicellular eukaryotes that are obligate parasites of vertebrates and insects.

From the above given options, A, B, E, G are TRUE regarding Plasmodium.

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Q:

Select the correct statement contrasting gametophytes and sporophytes.

A) Sporophytes are diploid, whereas gametophytes are haploid.	B) Sporophytes are vascular, whereas gametophytes are nonvascular.
C) Sporophytes are larger than gametophytes.	D) All of the above

Answer & Explanation Answer: A) Sporophytes are diploid, whereas gametophytes are haploid.

Explanation:

Sexual reproduction results in gametes that combine two cells from different individuals. Meiosis also produces gametes. Haploids contain one set of chromosomes in each of their cells. Diploids cells contain two chromosome sets. For plants, haploid and diploid cells divide via mitosis. The plants’ haploid phase is called the gametophyte, and the diploid phase is called the sporophyte.

Sporophytes are diploid plants that use meiosis to produce spores. These spores are haploid cells that grow into haploid gametophytes. Megaspores grow into female gametophytes, and microspores grow into male gametophytes.

Gametophytes are haploid plants that use mitosis to make haploid gametes. These gametes are female in the form of an ovum (egg) or male in the form of sperm.

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Filed Under: Biology
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Q:

Which best summarizes the concept of natural selection?

A) the fittest organisms survive and reproduce	B) an organism will always adapt to its environment
C) an organism will always mutate to survive	D) a mutation always makes a species fitter

Answer & Explanation Answer: A) the fittest organisms survive and reproduce

Explanation:

Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.

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Q:

In a box, there are 9 blue, 6 white and some black stones. A stone is randomly selected and the probability that the stone is black is ¼. Find the total number of stones in the box?

A) 15	B) 18
C) 20	D) 24

Answer & Explanation Answer: C) 20

Explanation:

We know that, Total probability = 1

Given probability of black stones = 1/4

=> Probability of blue and white stones = 1 - 1/4 = 3/4

But, given blue + white stones = 9 + 6 = 15

Hence,

3/4 ----- 15

1 ----- ?

=> 15 x 4/3 = 20.

Hence, total number of stones in the box = 20.

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Q:

From a group of 7 boys and 6 girls, five persons are to be selected to form a team, so that at least 3 girls are there in the team. In how many ways can it be done?

A) 427	B) 531
C) 651	D) 714

Answer & Explanation Answer: B) 531

Explanation:

Given in the question that, there are 7 boys and 6 girls.

Team members = 5

Now, required number of ways in which a team of 5 having atleast 3 girls in the team =

$(6 C_{3} x 7 C_{2}) + (6 C_{4} x 7 C_{1}) + (6 C_{5}) = [\frac{6 x 5 x 4}{3 x 2 x 1} x \frac{7 x 6}{2 x 1}] + [\frac{6 x 5 x 4 x 3}{4 x 3 x 2 x 1} x 7] + [\frac{6 x 5 x 4 x 3 x 2}{5 x 4 x 3 x 2 x 1}] = 420 + 105 + 6 = 531 .$

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Filed Under: Permutations and Combinations
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Q:

Select the correct statement about the pharynx.

A) The auditory tube drains into the nasopharynx	B) The laryngopharynx blends posteriorly into the nasopharynx
C) The palatine tonsils are embedded in the lateral walls of the nasopharynx	D) The pharyngeal tonsil is located in the laryngopharynx

Answer & Explanation Answer: A) The auditory tube drains into the nasopharynx

Explanation:

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Q:

Select the correct statement about oxygen transport in blood

A) A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal	B) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2
C) During conditions of acidosis, hemoglobin is able to carry oxygen more efficiently	D) Increased BPG levels in the red blood cells enhance oxygen-carrying capacity

Answer & Explanation Answer: B) During normal activity, a molecule of hemoglobin returning to the lungs carries one molecule of O2

Explanation:

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Q:

Select the correct statement about lymphocytes.

A) Lymph transport is faster than that occurring in veins	B) Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles
C) Lymph transport is only necessary when illness causes tissue swelling	D) Under normal conditions, lymph vessels are very high-pressure conduits

Answer & Explanation Answer: B) Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles

Explanation:

Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles is the correct statement regarding lymph transport.

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Filed Under: Biology
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