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Which of these is an adaptation of a chameleon?

List some importance of protozoa.

Why is irrigation done frequently during summer?

Which of the following organs produces the male gametes in the human reproductive system?

Unscramble the given words: -

i)nancyfi ii) turamyit

Following points are correct about microorganisms except

I. Microorganisms are used as food preservatives.

II. Microorganisms increase soil fertility.

III. Microorganisms are used to make antibiotics.

IV. Some Microorganisms clean the environment.

The tiny pores from which leaves take up carbon dioxide from the atmosphere are known as:

Which of the following are reasons for seed dispersal? (You may choose more than one option)

क्रियाओं से भी भाववाचक संज्ञाएँ बनती हैं। जैसे मारना से मार, काटना से काट, हारना से हार, सीखना से सीख, पलटना से पलट और हड़पना से हड़प आदि भाववाचक संज्ञाएँ बनी हैं। तुम भी इस संस्मरण से कुछ क्रियाओं को छाँटकर लिखो और उनसे भाववाचक संज्ञा बनाओ।

The Rhizobium bacteria present in the root nodules of pea plants can fix one of the following from the atmosphere. This one is :

(a) hydrogen (b) oxygen (c) nitrogen (d) halogen

Ram and Krishna both decided to grow wheat in their farms and bought seeds of the same quality. Ram cultivated chickpeas before wheat, whereas Krishna planted wheat directly with the required phosphate fertilizers. Ram's yield of wheat was 100 kg and Krishna's was 25 kg. How did Ram get a better yield than Krishna?

___________ is the yellow coloured part of the blood. Most of it is water (about 90%) and remaining (10%) consists of dissolved nutrients, proteins, waste products and hormones.

Who is the 'Father of Microbiology'?

A unicellular organism P lives in pond water. The organism P has no fixed shape, its shape keeps on changing. It moves and catches its prey with the help of organs Q which keep on appearing and disappearing. The organism P reproduces by a process R.

Another organism S also reproduces by this process. Name P, Q, R and S.

The source of oxygen for aquatic animals is

Tissue present below the skin epidermis which acts as an insulating layer is known as ___.

Fluid connective tissue contains:

Define reproduction. What is the purpose of reproduction? [2 MARKS]

The male copulatory organ is the

Regarding Assertion and Reason, choose the correct option

Assertion[A]: Dolly is a $100\%$ clone of a Finn dorset ewe.

Reason[R]: Dolly's nuclear DNA is from a Finn dorset ewe and her mitochondrial DNA is from a Scottish Blackface ewe.

The following picture shows a bacterial lawn in an agar plate with few clear zones. The zones are formed due to a chemical present in the disk at the centre of each zone. This chemical brings about a breakdown of bacterial cells and hence the clear zones. What is this chemical called and what are the primary sources of it?

Bacterial culture plate with clear zones

A project was launched in the name of this animal. Identify the name of the project and also write a short note on it.

[3 MARKS]

The term 'species' was coined by ______.

Discuss with an example how hybridization is used for developing new varieties of crops with desired characteristics?

What is a pyramid of biomass? Give an example of an inverted pyramid and explain why it is inverted.

Find the correct sequence of development of the offspring after fertilization.

During expiration the diaphragm becomes

Which of the following events are a part of a menstrual cycle?

i. The pituitary gland stimulates ovaries to produce oestrogen and progesterone.

ii. Ovulation takes place.

iii. Oestrogen stimulates the uterus to build up extra tissue and blood layer to make the wall nutritious for a zygote.

iv. On the absence of fertilisation, the egg is eliminated from the body along with the uterus lining which comes out as blood discharge at the time of menstruation.

Which of the following is not an example of a community?

In a living cell, chromatin is present in :