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15351.

Name the four types of ascocarps produced by ascomycetes. 

Answer»
  • Cleistothecium, Perithecium, Apothecium and Pseudothecium.
15352.

Neurospora, an ascomycetes fungus has been used as a biological tool to understand the mechanism of plant genetics much in the same way as Drosophila has been used to study animal genetics. What makes Neurospora as a genetic tool? Justify your answer. 

Answer»
  • Neurospora is used as a biological tool to understand the mechanism of plant genetics by the scientists. It because of the following reasons. 
  • It is haploid and so recessive traits can be studied easily. 
  • A lot of information is available about its genome. 
  • As a result of sexual reproduction, it produces eight ascospores which show a specific arrangement. This helps to study recombination. 
15353.

Passage cells are found in?

Answer»

opposite sides of protoxylem.

15354.

What are the functions of lenticels?

Answer»

The lenticel is the chief aerating structure occurs as a raised corky spot in the periderm of stem.

15355.

Why are stomata are sunken in xerophytes plants?

Answer»

To prevent water loss.

15356.

Epidermis does not contain(a) Stomata(b) Intercellular spaces(c)Trichomes(d) Cuticle

Answer»

The answer is (b) Intercellular spaces

15357.

Bulliform cells are found where and what is their role?

Answer»

Some of the cells in the leaves of grasses are comparatively very large, called bulliform or motor cells. They are thin-walled and contain big central vacuoles filled with water. They play an important role in the folding and unfolding of leaves.

15358.

Stomata are found on both epidermal layers in(a) monocots plants(b) xerophytes(c) aquatic plants(d) plants growing in salts

Answer»

The answer is (a) monocots plants

15359.

How are the lateral roots originate?

Answer»

The development of a lateral root begins with the formation of a meristematic region in the pericycle. As this grows, the new lateral root pushes out through the endodermis and cortex until it ruptures the surface. The structure of the lateral root is similar to that of the main root. Lateral root initiation in dicots will occur opposite the protoxylem poles. Lateral root initiation in monocots will occur between the protoxylem poles.

15360.

Stomata found in monocots plants are(a) Kidney shaped guard cells(b) Shape of apple seeds(c) dumbell shaped guard cells(d) Sunken stomata

Answer»

The answer is (c) dumbell shaped guard cells.

15361.

Amphivasal vascular bundles are found in.(a) Dracaena(b) Pranango(c) Sunflower(d) Cucurbita

Answer»

The answer is (a) Dracaena.

15362.

Amphivasal vascular bundles are found in.(a) Dracaena(b) Pranango(c) Sunflower(d) Cucurbita

Answer»

The answer is (c) Sunflower

15363.

Differentiate between Autumn wood and springwood?

Answer»
S.NoSpring wood (Early wood)Autumn wood (Late wood)
1.The portion of xylem formed during favourable spring season is called spring wood.The band of xylem formed during the unfavourable season of the year is called autumn wood.
2.This band of xylem is broad.This band of xylem is narrow.
3.The tracheary elements of xylem are thin walled with wide lumen.The tracheary elements of xylem are thick walled with narrow lumen.
4.Fibres are less is number. Fibres are abimdant
5.Spring wood is comparatively lighter in colour.Autumn wood is comparatively darker.
15364.

How the bark is formed in plants.

Answer»

The bark includes all the tissues outside the secondary phloem, i.e., pericycle, cortex, periderm and all dead cells external to periderm. Sometimes an addition-al layer of periderm is formed in the region of phloem so that all the tissues lying outside because dead. Under such conditions, all the dead tissues outside the active periderm (i. e., pericvclo, cortex and external periderm) are; considered as bark.

15365.

How does the environment affect the functionality of cambium?

Answer»

Factors controlling cambial activity:

  • The effects of temperature on the activity of the cambium are of prime importance. At relatively high temperatures the cambium is active, while at low temperatures dormancy is induced.
  • Changes in photoperiod seem to affect the type of wood produced more than the activity of the cambium. Under long day conditions, xylem elements of the early wood type are formed, while under short day conditions the xylem produced is of the late wood type. Photoperiod affects cambial activity and the type of its derivatives through its control of the buds.
  • Under high temperature and short day conditions, axillary buds have been found to sprout occasionally. Below these buds the wood produced is of the early type. Inhibitors produced by the leaves and retained in the stems.
15366.

Cambium ring forms(a) inside Phloem and outer Xylem(b) outside phloem and inside Xylem(c) outer phloem and inside parenchyma(d) outer xylem and inside parenchyma

Answer»

The answer is (b) outside phloem and inside Xylem

15367.

Intrafascicular cambium is an example of which kind of meristematic tissue?

Answer»

This fascicular cambium is derived from procambium of shoot apical meristem.

15368.

Cork cambium is differentiated at which place of the stem?

Answer»

The cork cambium (phellogen) produces dead cells or cork (phellem) towards outer side and living cells of secondary cortex (phelloderm) towards inner side. The cork cambium (phellogen) is a secondary lateral meristem which develops from permanent tissues in the region of epidermis, hypodermis, cortex or even in outer layers of phloem.

The cork cambium (phellogen) produces dead cells or cork (phellem) towards outer side and living cells of secondary cortex (phelloderm) towards inner side. These layers of cork, cork cambium and secondary cortex constitute the protective covering called periderm.

15369.

Cambium formation starts in dicot root(a) on the upper side of phloem pool(b) below xylem pool(c) below xylem pools(d) uncertain

Answer»

The answer is (c) below xylem pools

15370.

Comment on formation of cambium in roots?

Answer»

Secondary growth in dicotyledonous roots occurs by the initiation and activity of two secondary meristems

  1. Vascular cambium and
  2. Cork cambium (or phellogen)
15371.

Why the heart wood is used in making wood furniture? Explain the reasons,

Answer»

Hard and strong in nature

15372.

Name the improved characteristics of wheat that helped India achieve green revolution.

Answer»

i. Semi-dwarf nature

ii. Quick yielding feature

iii. High yielding feature

iv. Disease resistant feature

15373.

How the vascular cambium is formed? With the help of well-labelled diagram explain stellar secondary growth in Dicot plants?

Answer»

Formation of vascular cambium:

  1. The dicotyledonous stems are characterized by presence of cambium in between the primary xylem and primary phloem in each vascular bundle. It is called fascicular cambium.
  2. This fascicular cambium is derived from procambium of shoot apical meristem.
  3. Secondary growth initiates by the formation of new cambium in the primary medullary rays.
  4. The parenchymatous cells beside the fascicular cambium become meristematic and develop a new cambium, called interfascicular cambium.
  5. The fascicular and interfascicular cambium join with each other to form a complete ring of vascular cambium

Secondary Growth in Dicotyledonous Roots: Secondary growth in dicotyledonous roots occurs by the initiation and activity of two secondary meristems

  1. Vascular cambium.
  2. Cork cambium (or phellogen)
15374.

I was unable to ______ a word.(a) tall (b) utter (c) pronounce (d) speak

Answer»

Correct answer is (d) speak

15375.

Identify the character / speaker:1. “Are you all alone, my son”. 2. “Yes, I am going to school”. 3. “I had to change trains Anyway, I can travel alone”. 4. “And how long do you have to wait for your train?” 5. “Hello Arun! The train’s coming in late, as usual”. 6. “I am glad to know that” 7. “Yes I am Aron’s mother” 8. “These days one has to be very careful of strangers”. 9. “Here it comes”. 10. “Goodbye – mother……”

Answer»

1. The woman 

2. Arun 

3. Arun

4. The woman 

5. Satish 

6. Satish’s mother 

7. The woman 

8. Satish’s mother 

9. Satish 

10. Arun

15376.

How did the bond between Arun and the stranger develop?

Answer»

Arun liked the stranger for she seemed kind, sympathetic and understanding. She spoke to him affectionately. She took him to the station dining room and made him eat some food. Arun felt comfortable in her company.

15377.

Read the extracts and answer the questions that follow:“These days one has to be very careful of strangers”.1. Who said these words?2. Why did the speaker say so?

Answer»

1. Satish’s mother.

2. Nowadays strangers and suspicious characters are hanging around robbing, cheating and kidnapping people.

15378.

What was the reason behind Arun ‘s instinctive dislike towards Satish’s mother?

Answer»

Satish’s mother was an imposing woman. She did not care for other people’s sentiments. Her authoritative manner made him develop an instinctive dislike for her.

15379.

Satish’s mother did most of the ______ (a) talking (b)work (c) task (d) acting

Answer»

Correct answer is (a) talking

15380.

Why did Arun say, “I like strangers”?

Answer»

Satish’s mother advised Arun to be very careful when his mother was not with him. She sternly told him not to talk to strangers. Arun wanted to assert himself, so he said that he liked strangers.

15381.

Satish’s mother advised him not to A) jump on and off moving trains B) stick his head out of the window C) eat any rubbish on the way D) all of the above

Answer»

D) all of the above

15382.

Satish’s mother did not give Satish A) tea and sweets B) a bag of fruits C) a cricket bat D) a big box of chocolates

Answer»

A) tea and sweets

15383.

Read the conversation and complete the following:Ramani : Our new servant has a tendency to steal things. Somu : Is anything missing? Ramani : Yes, he has stolen one of our blankets. Somu : Which one?Ramani : It’s the one we took from Hotel Palm Beach.1. Ramani told Somu that …………. to steal things. 2. Somu asked Ramani …………………. . 3. Ramani answered that ……………… . 4. Somu further asked her which one and Ramani replied that …………. from Hotel Palm Beach.

Answer»

1. Ramani told Somu that their new servant had a tendency to steal things. 

2. Somu asked Ramani if anything was missing

3. Ramani answered that he had stolen one of their blankets

4. Somu further asked her which one and Ramani replied that it was the one they had taken from Hotel Palm Beach.

15384.

Read the conversation and complete the following:Child: I want a balloon, which I can release into the air. Belloon Man: Which colour balloon do you want? Child: Which colour balloon will take me up with it? Balloon Man : It is not the colour of the balloon, it is what is inside that makes it go up.1. The child told the balloon man that ……. which he could release into the air. 2. The balloon man asked him …………… . 3. The child asked him ………… up with that. 4. The balloon man told him that it was not the colour of the balloon but ………… go up.

Answer»

1. The child told the balloon man that he wanted a balloon which he could release into the air. 

2. The balloon man asked him which colour balloon he wanted

3. The child asked him which colour balloon would take him up with that. 

4. The balloon man told him that it was not the colour of the balloon but what was inside that made it go up.

15385.

Read the conversation and complete the following:Father : Why were you late from school yesterday? Ashwin : There was a friendly football match between our school and G.K. Public School.Father : Why didn’t you inform us earlier? Ashwin : I rang home but nobody picked up the phone.1. Father asked Ashwin ………… . 2. Ashwin replied that …………… and G.K Public School. 3. Father asked ………. earlier. 4. Ashwin replied that he ……………. up the phone.

Answer»

1. Father asked Ashwin why he had been late from school the day before

2. Ashwin replied that there was a friendly football match between their school and G.K. Public School. 

3. Father asked why he had not informed them earlier. 

4. Ashwin replied that he had rung home but nobody had picked up the phone.

15386.

Complete the following:Arunsays, “I had taken an instinctive dislike to Satish’s mother.”

Answer»

Mention three things that made Arun dislike her. Satish’s mother had an imposing personality. She was proud and domineering. Her talk and her insulting behaviour made Arun dislike her.

15387.

AIDS is caused by HIV. Among the following, which one is not a mode of transmission of HIV? a. Transfusion of contaminated blood b. Sharing the infected needles c. Shaking hands with infected persons d. Sexual contact with infected persons

Answer» c. Shaking hands with infected persons
15388.

In malignant tumors, the cells proliferate, grow rapidly and move to other parts of the body to form new tumors. This stage of disease is called:a. metagenesisb. metastasisc. teratogenesisd. mitosis

Answer» b. metastasis
15389.

Which of the following are the reason(s) for Rheumatoid arthritis? Choose the correct option. i. Lymphocytes become more active  ii. Body attacks self cells iii. More antibodies are produced in the body iv. The ability to differentiate pathogens or foreign molecules from self cells is lost (a) i and ii (b) ii and iv (c) iii and iv (d) i and iii

Answer» The correct answer is (b) ii and iv
15390.

When an apparently healthy person is diagnosed as unhealthy by a psychiatrist, the reason could be that: a. the patient was not efficient at his work b. the patient was not economically prosperous c. the patient shows behavioural and social maladjustment d. he does not take interest in sports

Answer»

c. the patient shows behavioural and social maladjustment

15391.

A sign or special character that can be inserted in the page maker document is on ………(a) Symbol (b) Menu (c) Formula (d) Sign

Answer»

A sign or special character that can be inserted in the page maker document is on Symbol.

15392.

In page maker, text and graphics that you draw or import are called ………(a) event (b) handle (c) tool (d) objects

Answer»

In page maker, text and graphics that you draw or import are called objects.

15393.

Identify the statement which is wrong? (a) One line down – alt + ↓ (b) Beginning of current line – shift + home (c) One character to the left – shift + ←

Answer»

(a) One line down – alt + ↓

15394.

Which menu has polygon settings options? (a) Tools (b) Layout (c) Element (d) Place

Answer»

Correct Answer is: (c) Element

15395.

Find the wrong statement. (a) Press Ctrl + spacebar to zoom in (b) Press alt + spacebar to zoom out (c) Press alt + Ctrl + spacebar to zoom out

Answer»

(b) Press alt + spacebar to zoom out

15396.

Text that flows through one or more threaded blocks is (a) blocks (b) story (c) thread (d) unthread

Answer»

Correct Answer is: (b) story

15397.

The flashing verticle bar is called ……… (a) sroll bar (b) ruler (c) Footer (d) Insertion point

Answer»

The flashing verticle bar is called Insertion point.

15398.

How many line tools are there? (a) 2 (b) 3(c) 4 (d) 5

Answer»

Correct Answer is: (a) 2

15399.

How many scroll bars are there? (a) 1 (b) 2 (c) 3(d) 4

Answer»

Correct Answer is: (b) 2

15400.

How will you get control palette? (a) alt + ’ (b) shift + ’ (c) esc (d) Ctrl +

Answer»

Correct Answer is: (d) Ctrl + ’