Biology Test 348

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Biology Test 348

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Weekly Quiz Competition

Question 1
4 / -1

Assertion : Flowers are the site of sexual reproduction in angiosperms.

Reason : In the flower, androecium represents the male reproductive organs and gynoecium represents the female reproductive organs.

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

Angiospermic flowers perform the process of sexual reproduction. This is because they contain the male and female sex organs of the plant.
Question 2
4 / -1

Site of photosynthesis in C₄ plant is

A
mesophyll cells

B
bundle sheath cells

C
Both (a) and (b)

D
Cytosol

Solution

In C₄ plants, photosynthesis occurs in chloroplast of mesophyll and bundle sheath cells. While in C₃ plants photosynthesis occurs only in mesophyll cells.
Question 3
4 / -1

Statement I : During oxidation within a cell, all the energy contained in respiratory substrates is released in a series of slow step-wise reactions controlled by enzymes.

Statement II : Released energy in respiration is trapped as light energy in the form of ATP.

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) Released energy in respiration is trapped as chemical energy in the form of ATP.
Question 4
4 / -1

Which of the following cass of algae is mostly found in salt water ?

A
Phaeophyceae

B
Rhodophyceae

C
Chlorophyceae

D
Both (a) and (b)

Solution

Rhodophyceae are commonly called as red algae because of the predominance of the red pigment (r - phycoerythrin) in their body. They are mostly found in salt water.
Question 5
4 / -1

Identify the correct and incorrect statements from the following.

(i) 17,500 new cells are produced per hour by a single maize root apical meristem.

(ii) With the help of length, growth of pollen tube is measured.

(iii) The growth of the leaf is measured in terms of volume.

(iv) Cells in a watermelon may increase in size by upto 3,50,000 times.

A
(i), (ii), (iii) are correct and (iv) is incorrect.

B
(i), (ii), (iv) are correct and (iii) is incorrect.

C
(ii), (iii) are correct and (i), (iv) are incorrect.

D
(i), (iv) are correct and (ii), (iii) are incorrect.

Solution

The growth of the leaf is measured in terms of surface area.
Question 6
4 / -1

Q: Hydrocolloid is

A
Water soluble substance

B
Hydrogen gas containing substance

C
Water holding substance

D
Oxygen gas containing substance

Solution

Marine brown and red algae produce large amounts of hydrocolloids (water-holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially
Question 7
4 / -1

Diagram given below shows the stages in embryogenesis in a typical dicot plant (Capsella). Identify the structures Zygote

A
Suspensor, Radicle, Plumule, Cotyledons

B
Hypophysis, Radicle, Plumule, Cotyledons

C
Suspensor, Plumule, Radicle, Cotyledons

D
Suspensor, Radicle, Plumule, Hypocotyls

Solution

The given figure shows the stages in embryogenesis in a typical dicot (Capsella). The structure marked as A, B, C and D is respectively suspensor, radicle, plumule and cotyledon. Suspensor is a suspending part or structure as a group or chain of cells that is produced from the zygote of a seed plant and serves to push the developing embryo into the endosperm. Radicle is the part of a plant embryo that develops into the primary root. Plumule is the young shoot of a plant embryo above the cotyledons, consisting of the epicotyl and often of immature leaves. Cotyledon is an embryonic leaf in seed-bearing plants, one or more of which are the first leaves to appear from a germinating seed.
Question 8
4 / -1

Assertion : ATP synthase has a channel that allows diffusion of protons back across the membrane.

Reason : This releases enough energy to activate ATPase enzyme that catalyses the formation of ATP.

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

ATP synthase has a channel that allows diffusion of protons back across the membrane that is from lumen to stroma. This releases enough energy to activate ATPase enzyme that catalyses the formation of ATP from ADP.
Question 9
4 / -1

In mitochondria, protons accumulate in the

A
outer membrane

B
inner membrane

C
inter membrane space

D
matrix

Solution

During aerobic respiration in mitochondria, protons accumulate in the intermembrane space while electrons move through the electron transport chain.
Question 10
4 / -1

Which of the following statement is true?

A
In palmately compound leaves the leaflets are attached at a common point

B
Leaves are modified into tendrils for climbing as in pumpkins.

C
Imbricate aestivation of petals occur in the flower of Calotropis.

D
In Alstonia, the petioles expand, become green, and synthesize food.

Solution

Palmately compound leaves are a type of compound leaf where the leaflets are attached at a common point, like the fingers of a hand. Each leaflet in a palmately compound leaf is similar in size and shape. Examples of plants with palmately compound leaves include the horse chestnut and the buckeye.

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Biology Test 348

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Biology Test 348

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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

mesophyll cells

bundle sheath cells

Both (a) and (b)

Cytosol

Solution

Question 3

Both statements are correct.

Statement I is correct & II is incorrect.

Statement I is incorrect & II is correct.

Both statements are incorrect.

Solution

Question 4

Phaeophyceae

Rhodophyceae

Chlorophyceae

Both (a) and (b)

Solution

Question 5

(i), (ii), (iii) are correct and (iv) is incorrect.

(i), (ii), (iv) are correct and (iii) is incorrect.

(ii), (iii) are correct and (i), (iv) are incorrect.

(i), (iv) are correct and (ii), (iii) are incorrect.

Solution

Question 6

Water soluble substance

Hydrogen gas containing substance

Water holding substance

Oxygen gas containing substance

Solution

Question 7

Suspensor, Radicle, Plumule, Cotyledons

Hypophysis, Radicle, Plumule, Cotyledons

Suspensor, Plumule, Radicle, Cotyledons

Suspensor, Radicle, Plumule, Hypocotyls

Solution

Question 8

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 9

outer membrane

inner membrane

inter membrane space

matrix

Solution

Question 10

In palmately compound leaves the leaflets are attached at a common point

Leaves are modified into tendrils for climbing as in pumpkins.

Imbricate aestivation of petals occur in the flower of Calotropis.

In Alstonia, the petioles expand, become green, and synthesize food.

Solution

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