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Q:

Which of the following plays an important part in photosynthesis?

A) Chloroplast B) Centrosome
C) Tonoplast D) Nematoblast

Answer:   A) Chloroplast



Explanation:

The Chloroplast contains the wonder green pigment chlorophyll which is able to trap solar energy and use it for synthesis of food

Subject: Biology
Q:

Hormones are chemicals secreted and regulated by the endocrine system.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

True. Hormones are chemicals secreted and regulated by the endocrine system.

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1 45
Q:

Which would provide the body with the most energy?

A) Breaking a single carbon bond B) Forming bonds between two amino acids
C) Creating bonds to form a carbohydrate D) Breaking the bonds in a monosaccharide
 
Answer & Explanation Answer: D) Breaking the bonds in a monosaccharide

Explanation:
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Q:

Where in the cell are chromosomes located?

A) mitochondria B) DNA
C) RNA D) Nucleus
 
Answer & Explanation Answer: D) Nucleus

Explanation:

In all plants and animal cells chromosomes are located in the Nucleus of the cells.

 

 

 

The Chromosomes are thread like structures present in the nucleus of the cells which are made up of proteins and a single molecule of DNA.

 

 

 

Their function is to carry the characteristic features of parent cells to daughter cells. 

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Q:

Most absorption of nutrients occurs in the

A) Stomach B) Liver
C) Large intestine D) Small intestine
 
Answer & Explanation Answer: D) Small intestine

Explanation:

The small intestine is the main area of the GI tract for absorption.

 

The small intestine has three separate sections. Theyare :

1. The duodenum

2. Jejunum and

3. Ileum.

 

Hence, the majority of nutrient absorption occurs in the duodenum and jejunum of small intestine.

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Q:

Which of these is unique to flowering plants?

A) double fertilization B) an embryo surrounded by nutritive tissue
C) haploid gametophytes D) pollen production
 
Answer & Explanation Answer: A) double fertilization

Explanation:

In flowering plants one sperm nucleus fertilizes the egg and the other sperm nucleus fuses with two other nuclei found within the ovule, thus forming triploid endosperm.

 

Hence, double fertilization is unique to flowering plants.

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Q:

When is genetic drift a major factor in evolution?

A) When there is male competition B) When there is artificial selection
C) When there is no selective pressure D) When there is disruptiveselection
 
Answer & Explanation Answer: C) When there is no selective pressure

Explanation:

Genetic drift or allelic drift is the change in the relative frequency in which a gene variant (allele) occurs in a population due to random sampling and chance.

 

When is genetic drift a major factor in evolution is

* When there is low gene flow.

* When there is no selective pressure.

* When there is a bottleneck.

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Q:

Which statement describes decomposers?

A) Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems. B) Decomposers can produce their own source of energy and can sometimes act as primary producers.
C) Decomposers are those organisms that recycle matter in the ecosystem.. D) All the above
 
Answer & Explanation Answer: C) Decomposers are those organisms that recycle matter in the ecosystem..

Explanation:

Decomposers are organisms that break down dead or decaying organisms, and in doing so, they carry out the natural process of decomposition.

 

The statement "Decomposers are those organisms that recycle matter in the ecosystem" describes decomposers.

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Q:

Which of the following is considered a modified stem?

A) Tendril B) Taproot
C) Petiole D) Tuber
 
Answer & Explanation Answer: D) Tuber

Explanation:

Tuber is considered as a modified stem. These type of stems carry out special functions that are important for the plant to survive. Tubers serves as a food reserve and bearing buds wherein new plants can grow.

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