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Biology Quiz - 2, General Knowledge


25 Questions MCQ Test General Knowledge | Biology Quiz - 2, General Knowledge


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Attempt Biology Quiz - 2, General Knowledge | 25 questions in 50 minutes | Mock test for Current Affairs preparation | Free important questions MCQ to study General Knowledge for Current Affairs Exam | Download free PDF with solutions
QUESTION: 1

Placenta is the structure formed

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QUESTION: 2

O2 released in the process of photosynthesis comes from

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QUESTION: 3

Plants hormone that induces cell division is

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QUESTION: 4

Neurospora is used as genetic material because
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QUESTION: 5

Phloem is a tissue found in
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QUESTION: 6

N2 content is kept constant in the biosphere due to
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QUESTION: 7

out of proteins, lipids and carbohydrates present in a cell membrane, what is true?
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QUESTION: 8

Potato is a modified form (outgrowth) of
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QUESTION: 9

Of the following taxonomic categories which is the most inclusive (i.e. is the highest in hierarchy)?
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QUESTION: 10

Prothrombin which helps in clotting of blood is released by
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QUESTION: 11

Myopia is connected with
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QUESTION: 12

Most of the red, blue and purple colours of plants are due to a pigment called
Solution: Anthocyanin - A blue, violet, or red flavonoid pigment found in plants.
QUESTION: 13

Plants developing in dry conditions are
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QUESTION: 14

Plants growing on sand are called as
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QUESTION: 15

Our skin, when exposed to excess sunlight, becomes dark. This is because our skin pigments called
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QUESTION: 16

Ramapithecus and Cro-Magnon man are considered
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QUESTION: 17

Normal adult human male has
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QUESTION: 18

Plants wilt due to excess of
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QUESTION: 19

Poison glands of snakes are homologous to
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QUESTION: 20

Radical vascular bundles are those in which
Solution:

With the help of examples, explain the various types of vascular bundles.

In angiosperms the vascular bundles are mainly of three types (i) radial (ii) conjoint (iii) concentric.

(i) Radial : Presence of radial vascular bundles is the characteristic feature of roots. Those vascular bundles in which xylem and phloem are present on different radii are known as radial vascular bundles. In between xylem and phloem bundles parenchymatous cells are present.

(ii) Conjoint : In these vascular bundles xylem and phloem are present on the same radii. Conjoint vascular bundles may be collateral (phloem is present only outer to xylem) or bicollateral (phloem is present on both sides of xylem). If cambium is present between xylem and phloem then the vascular bundle is known as open, otherwise it is called closed.

(iii) Concentric : Those vascular bundles in which one type of vascular tissue is surrounded by another type are known as concentric vascular bundles. These bundles may be amphivasal or leptocentric(phloem is completely surrounded by xylem) or amphicribal or hardocentric (xylem is completely surrounded by phloem). Amphivasal bundles are found in Dracaena and Yucca. Amphicribal bundles are found in stamens of many dicots etc.

Radical vascular bundles are those in which xylem and phloem occur on the different radii.

QUESTION: 21

Plant bends towards the source of light on account of the movement of curvature known as
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QUESTION: 22

Monotremes are unique mammals because they
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QUESTION: 23

Plant have ____ while animals lack it.
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QUESTION: 24

Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?
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QUESTION: 25

Ptyalin is an enzyme produced in the
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