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Which of the following correctly describes triple fusion?

Bronchi branch into the tubes of smaller diameters (less than 1 mm) known as ______.

The double helical model of DNA was first constructed by:

Binary fission is a mode of

A network of filamentous structure present in the cytoplasm which are involved in many function such as mechanical support, motility, maintainence of the shape of the cell. This elaborate network of filaments present in the cytoplasm is ______ in nature and is collectively referred to as the ______.

How many eggs do you
think were released by the ovary of a female dog

which gave birth to 6
puppies?

Which of these plants will produce seeds?

केशव दस साल का है। क्या उसकी उम्र के बच्चों का इस तरह के काम से जुड़ना ठीक है? अपने उत्तर के कारण ज़रूर बताओ।

Which of the following can be termed as opposite of Bohr's effect ?

The life cycle in which diploid Gametophyte phase is dominant?

The production of new characteristics by introducing new genes and altering the genome is called

Lactational amenorrhea is a __ method of contraception.

Which of
the following statements are true? If false, correct them:

(a) Boron
deficiency leads to stout axis.

(b) Every
mineral element that is present in a cell is needed by the cell.

(c)
Nitrogen as a nutrient element, is highly immobile in the plants.

(d) It is
very easy to establish the essentiality of micronutrients because
they

are required only in trace quantities.

Connective tissue originates from______.

Will superior or inferior ovary effect the type of fruits formed??

If yes how will it effect ??

Which of the following type of meristem gives rise to the vascular tissue?

AIDS is caused by HIV. Among the following, which one is not a mode of transmission of HIV?

Name some professions other than medicine which require a basic knowledge of Biology.

Which of the following are functions of components of the respiratory system?

what is semi permeable membrane and how is it helpful in the process of osmosis?

Gene transfer by the help of virus is called:

Question 28

Given below is a conversation between two farmers Heera and Beera.

Heera : Brother Beera, your maize crops looks beautiful! They have grown pretty fast.

Beera : Yes, I have sprayed urea this time. What about you?

Heera : Well, I am still relying on good old cow dung. I am saving money for buying a tractor.

Beera : That’s good. Tractor saves a lot of time and labour.

Heera : Yes, it’s been very labour intensive for me and now these weeds have come up.

Beera : Try weedicides, they are very effective.

Now answer the following questions.

(i) List the practices which are not environment friendly and why?

(ii) What is the advantage of modern agriculture implements over traditional ones?

(iii) Name one weedicide and the precaution farmers must take during its application.

Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?

Explain each point– nucleolus, chromatin, nucleoplasm, nuclear membrane and nuclear pores. Give their one function.

Identify which of the following option will play a vital role in the activation of nitrogenase enzyme in nitrogen fixation?

The neurotransmitter released into the synapse between neurons and muscle cells that stimulate skeletal muscle cell is

Match the excretory functions of Section I with the parts of the excretory system in Section II. Choose the correct combination from the answers given.

$\begin{array}{cc}SectionI& SectionII\\ \left(Functions\right)& \left(Partsofexcretorysystems\right)\\ A.Ultrafiltration& 1.Henl{e}^{\prime }sloop\\ B.Concentrationofurine& 2.Ureter\\ C.Transportofurine& 3.Urinarybladder\\ D.Storageofurine& 4.Malpighiancorpuscle\\ & 5.Proximalconvolutedtubule\end{array}$