Biology Test 347

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Biology Test 347

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Weekly Quiz Competition

Question 1
4 / -1

Assertion : It is believe that the first cell on this planet lived in an atmosphere that lacked oxygen.

Reason : Living organisms retain the enzymatic machinery to partially oxidise glucose without the help of oxygen.

A
Assertion and reason both are true and the reason is correct explanation of assertion.

B
Assertion and reason both are true but reason is not correct explanation of assertion.

C
Assertion is true but reason is wrong.

D
Assertion and reason both are wrong.

Solution

Scientists believe that the first cells on the earth were anaerobes. Even today, many organisms are anaerobes. While some organisms are obligate anaerobes, many others are facultative anaerobes which means they carry on anaerobic respiration under special circumstances. Thus, all the organisms have the capability to partially oxidize glucose without the help of oxygen. It is this ability of organisms which must have helped the first cells on the earth to survive without oxygen.
Question 2
4 / -1

Phylogenetic classification system is based on the

A
evolutionary relationships between the various organisms.

B
anatomical characters of various organisms.

C
physiological characters of various organisms.

D
morphological characters of various organisms.

Solution

Phylogenetic system of classification indicates the evolutionary as well as genetic relationships among organisms. It is based on fossil record, biochemical, anatomical, morphological, embryological, physiological, genetics, karyotype and other studies.
Question 3
4 / -1

Which of the following statements are for gibberellins ?

(i) Spraying juvenile conif ers with GAs hastens the maturity period, thus leading to early seed production.

(ii) Promotes bolting in beet, cabbages and many plants with rosette habit.

(iii) It helps to produce new leaves, chloroplasts in leaves, lateral shoot growth and adventitious shoot formation.

(iv) Their ability to cause an increase in length of axis is used to increase the length of grapes stalks.

(v) It help to initiate rooting in stem cuttings.

(vi) It promote flowering eg. in pineapples.

A
(i), (ii), (iii), (v) and (vi)

B
(i), (ii), (v) and (vi)

C
(i), (ii), and (iv)

D
All of these

Solution

(i) Cytokinins have specific effects on cytokinesis.

(ii) Cytokinins is a modified form of adenine.

(iii) Kinetin does not occur naturally in plants.

(iv) Zeatin is isolation from coconut milk.
Question 4
4 / -1

" X " being a higher category is the assemblage of families which exhibit a few "Y" characters. The "Z" characters are less in a number as compared to different genera included in a family. Identify "X", "Y", and "Z".

A
X - Order; Y - Similar; Z - Similar

B
X - Genus; Y - Similar; Z - Different

C
X - Species; Y - Different; Z - Similar

D
X - Class; Y - Different; Z - Different
Solution
- Order being a higher category is the assemblage of families which exhibit a few similar characters.
- The similar characters are less in number as compared to different genera included in a family.
Question 5
4 / -1

Statement I : Pea and groundnut have non- albuminous seeds.

Statement II : In pea and groundnut seeds retain a part of endosperm as it is not completely used up during embryo development.

A
Both statements are correct

B
Statement I is correct & II is incorrect

C
Statement I is incorrect & II is correct

D
Both statements are incorrect

Solution

(II) In pea and ground nut seeds does not retain a part of endosperm as it is completely used up during embryo development.
Question 6
4 / -1

Which is the primary CO₂ fixation product in C₄plant?

A
3-phosphoglyceric acid

B
Oxaloacetic acid

C
Phosphoenol pyruvate

D
RuBP

Solution

In C₄ plants, a 4 - C compound oxaloacetic acid (OAA) is the first stable product, and phosphoenol pyruvate (PEP) is the CO₂ acceptor. This reaction is catalyzed by the enzyme PEP carboxylase or PEPcase in mesophyll cells of the leaf.
Question 7
4 / -1

Glycolysis occurs in the ______ and produces ______, which in the presence of O₂ enters the ______.

A
cytosol; pyruvate; mitochondrion

B
cytosol; glucose; mitochondrion

C
mitochondrion; pyruvate; chloroplast

D
chloroplast; glucose; cytosol

Solution

Glycolysis occurs in the cytoplasm and does not use oxygen. Thus, it is an anaerobic pathway. In this process, glucose is partially oxidized/converted into two molecules of pyruvate/ pyruvic acid. In aerobic respiration pyruvate enters mitochondrion through a specific transport protein. It undergoes oxidative decarboxylation and dehydrogenation to produce CO₂, and NADH.
Question 8
4 / -1

Which of the following class of algae is rarely found in fresh water ?

A
Chlorophyceae

B
Phaeophyceae

C
Rhodophyceae

D
Both (a) and (b)

Solution

The members of phaeophyceae or brown algae are found primarily in marine habitats. The common forms are Ectocarpus, Dictyota, Laminaria, Sargassum and Fucus.
Question 9
4 / -1

Q: Which one is correct about heterosporous pteridophytes?

A
Microspore and megaspores develop into the male and the female gametophytes respectively.

B
The female gametophyte are retained on the parent sporophyte for a variable period.

C
The development of the zygote into the embryo takes place within the female gametophyte.

D
All

Solution

The megaspores and microspores germinate and give rise to female and male gametophytes, respectively. The female gametophytes in these plants are retained on the parent sporophytes for variable periods. The development of the zygotes into young embryos take place within the female gametophytes. This event is a precursor to the seed habit considered an important step in evolution
Question 10
4 / -1

Which of the following represents correct binomial name of wheat?

A
Triticum Vulgare Linn

B
Triticum aestivum Linn

C
Oryza sativa Linn

D
Zea mays Linn

Solution

The rules of binomial nomenclature states that

1. All living organisms should have scientific name consisting of two words, the first is the genus and starts with a capital letter and the second is the species, starting with a small letter.

2. All names should be in italics if typed or printed.

3. When handwritten, the two words of the scientific name are separately underlined.

So the correct scientific name of wheat is TriticumaestivumLinn.

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Biology Test 347

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Biology Test 347

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SHARING IS CARING

Question 1

Assertion and reason both are true and the reason is correct explanation of assertion.

Assertion and reason both are true but reason is not correct explanation of assertion.

Assertion is true but reason is wrong.

Assertion and reason both are wrong.

Solution

Question 2

evolutionary relationships between the various organisms.

anatomical characters of various organisms.

physiological characters of various organisms.

morphological characters of various organisms.

Solution

Question 3

(i), (ii), (iii), (v) and (vi)

(i), (ii), (v) and (vi)

(i), (ii), and (iv)

All of these

Solution

Question 4

X - Order; Y - Similar; Z - Similar

X - Genus; Y - Similar; Z - Different

X - Species; Y - Different; Z - Similar

X - Class; Y - Different; Z - Different

Solution

Question 5

Both statements are correct

Statement I is correct & II is incorrect

Statement I is incorrect & II is correct

Both statements are incorrect

Solution

Question 6

3-phosphoglyceric acid

Oxaloacetic acid

Phosphoenol pyruvate

RuBP

Solution

Question 7

cytosol; pyruvate; mitochondrion

cytosol; glucose; mitochondrion

mitochondrion; pyruvate; chloroplast

chloroplast; glucose; cytosol

Solution

Question 8

Chlorophyceae

Phaeophyceae

Rhodophyceae

Both (a) and (b)

Solution

Question 9

Microspore and megaspores develop into the male and the female gametophytes respectively.

The female gametophyte are retained on the parent sporophyte for a variable period.

The development of the zygote into the embryo takes place within the female gametophyte.

All

Solution

Question 10

Triticum Vulgare Linn

Triticum aestivum Linn

Oryza sativa Linn

Zea mays Linn

Solution

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