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Class 12

Biology

Cell Structure And Functions

Solution for Class 12, Biology, Cell Structure And Functions

Question 41

One of the representatives of Phylum Arthropoda is

puffer fish
flying fish
cuttle fish
silver fish.

Topic:

Cell: Structure and Functions

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Question 42

fion but description of a multistep process called photosynthesis. can you explain why twelve molecules of water as substrate are used yinc equation given above?

{"135 WHERE DOES PHOTOSYNTHESIS TAKE PLACE?","196 WHERE DOES PHOTOSYNTHESIS TAKE PLACE? pou would of course answer: in 'the green leaf or in the chloroplasts', bast on what you earlier read in Chapter 8 . You are definitely right. pho losynthesis does take place in the green leaves of plants but it does so aleq in other green parts of the plants. Can you name some other parts","You would recollect from previous unit that the mesophyll cells in the themselves along the walls of the mesophyll cells, such that they get the optimum quantity of the incident light. When do you think the chloroplasts will be aligned with their flat surfaces parallel to the walls? no n","When have studied the structure of chloroplast in Chapter 8 . Within You have studied the structure of chloroplast in Chapter 8 . Within chloroplast there is membranous system consisting of grana, the the chioroplast there is membranous system consisting of grana, the stroma lamellae, and the matrix stroma (Figure 13.2). There is a clear division of labour within the chloroplast. The membrane system is responsible for trapping the light energy and also for the synthesis of ATP and NADPH. In stroma, enzymatic reactions synthesise sugar, which in turn forms starch The former set of reactions, since they are directly light driven are called light reactions (photochemical reactions). (The latter are not directly light driven but are dependent on the products of light reactions (ATP and NADPH). Hence, to distinguish the latter they are called, by conventiof, as dark reactions (carbon reactions). However, this should not be constued to mean that they occur in darkness or that they are not light-dependent."}

Topic:

Cell: Structure and Functions

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Question 43

A,B,C The year 1900 AD is highly significant for geneticists due to 33. The year 1900 AD is highly significant for geneticists due to

1) Discovery of genes 2) Principles of linkage

4) all the above 34. Study the following periods of geold 4) Rediscovery of mendelism 34. Study the following periods of geological time scale, and arrange them in correct sequence

Carboniferous
Cambrian
Silurian
Devonian
Permian

Topic:

Cell: Structure and Functions

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Question 44

c d e a f b 2 ) e b d a

Ordovicia 2) e b d List II i. Hormone

Topic:

Cell: Structure and Functions

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Question 45

Which of the would appear as the pioneer organisms on bare rocks

1) Mosses 2) Lichens 3) Liver worts 4) Green algal

62. The disorder ca

Tetany
Osteoporosis

Topic:

Cell: Structure and Functions

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Question 46

Maize leads to presistance to maize stem borers due to

Low aspartic, acid, Low nitrogen and sugar content
High aspartic, high nitrogen and sugar
High aspartic low nitrogen and sugar
High aspartic, low nitrogen and high sugar

Topic:

Cell: Structure and Functions

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Question 47

Read the following statements and select the correct option [Page No. 139 , Para-1", Line-1st, Page No.136,Para-3rd, line-7; Page-135, Para-3rd, para-3rd, line-3]

The prophase nucleus has a loose and indistinct network of nucleoprotein in fibres
Sedimentation coefficient is a measure of density and size.
The ribosomes of chloroplast are targer $5 m$ than the cytoplasmic ribosome
Carotenoids are water soluble pigments

Topic:

Cell: Structure and Functions

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Question 48

Figure