List of top Botany Questions

उन प्रयोगों के सही क्रम का चयन कीजिए जिनके कारण पौधों में प्रकाशसंश्लेषण की क्रियाविधि समझ विकसित हुई :

प्रकाश-श्वसन (Photorespiration) के संबंध में निम्नलिखित में से कौन से कथन सही हैं ?
(a) यह C3 पौधों में होती है।
(b) \(CO_2\) का उपयोग होता है और \(O_2\) उत्पन्न होता है।
(c) फॉस्फोग्लाइकोलेट बनता है।
(d) ATP और NADPH का संश्लेषण नहीं होता।

मैड काउ रोग ________ के कारण होता है।

नीचे दो कथन दिए गए हैं :
कथन I : जिम्नोस्पर्म (अनावृतबीजी) में, नर और मादा युग्मकोद्भिद बीजाणुधानी के भीतर ही रहते हैं।
कथन II : जिम्नोस्पर्म (अनावृतबीजी) में, द्विगुणित ऊतक उपस्थित नहीं होते हैं।
उपयुक्त विकल्प चुनिए :

सूची-I को सूची-II के साथ सुमेलित कीजिए।
\[ \begin{array}{ll} A.\; युग्मकों के बीच जीवद्रव्य का संलयन & I.\; अर्धसूत्री विभाजन \\ B.\; दो केन्द्रकों का संलयन & II.\; प्लाज्मोगैमी \\ C.\; अगुणित बीजाणुओं का निर्माण & III.\; केन्द्र संलयन \end{array} \] नीचे दिए गए विकल्पों में से सही उत्तर चुनिए :

पर्णविन्यास (Phyllotaxy) ________ के लगने के क्रम को कहते हैं।

नीचे दो कथन दिए गए हैं :
कथन I : प्रोफेज I के अंत में गुणसूत्र पूरी तरह से संघनित हो जाते हैं।
कथन II : अर्धसूत्री विभाजन I (Meiosis I), समसूत्री विभाजन (Mitosis) के समान होता है।

The egg apparatus in the mature embryo sac consists of a single egg cell in ________.

Ethylene is a phytohormone and also: A. Known as fruit ripening hormone B. Causes leaf epinasty in tomato, potato and pea C. Induces flowering in pine apple and mango D. Promotes formation of male flowers and suppresses the number of female flowers considerably E. Promotes abscission of leaves in plants. Choose the correct answer from the options given below:

Identify the correct statements about 'Probiotics'. A. are living organisms B. have multiple interaction with the host C. in adequate amount, confers health benefits to the host D. Bifidobacterium and Lactobacillus E. used in antibiotic associated diarrhea. Choose the correct answer from the options given below:

Identify the wrongly paired options given below regarding the shape of plastids. A. Girdle shaped in Ulothrix B. Reticulate in Cladophora C. Discoid in Oedogonium D. Spiral in Hydrodictyon E. Stellate in Zygnema. Choose the correct answer from the options given below:

Identify correct statements about 'Enzyme'. A. Enzymes are the protein biocatalysts which are synthesized by the living cells. B. An enzyme is specific in its action, possessing active site. C. Enzyme activities are inhibited by only reversible manner. D. Many enzymes require certain non-protein substrate called cofactor for their action. E. Estimation of serum enzymes is of great help in the diagnosis of several diseases. Choose the correct answer from the options given below:

Identify correct statements about 'DNA content'. A. Each species has a characteristic content of DNA. B. Eukaryotes always contain much more DNA than prokaryotes. C. Lower eukaryotes in general have higher DNA than E. coli. D. Vertebrates have equal amount of DNA as in E. coli. E. 1 pg of DNA is equivalent to 93 cm of DNA. Choose the correct answer from the options given below:

Which among the following do not represent the correctly matched group? A. Dermatogen - Periblem - Plerome B. Calcium oxalate - Raphides - Cystoliths C. Sieve tube element - P Proteins - Companion cell D. Sieve cell - Sieve tube element - Perforation plates E. Sieve plate - Sieve area - Callose. Choose the correct answer from the options given below:

Identify the correct statements from the following. A. Species of Cycas are strictly monoecious. B. The ovule of Cycas is orthotropous. C. Female cones of Cycas are larger than male cones. D. The intine of microspores in Pinus expand on lateral sides to form the wings. E. The roasted seeds of Pinus gerardiana are edible. Choose the correct answer from the options given below:

Which among the following are correct statements? A. Protophloem is a part of secondary phloem B. Included phloem constitutes phloem strands in secondary xylem C. Secondary phloem originates from procambium D. Internal phloem constitutes phloem strands in pith E. Included phloem constitutes phloem strands in pith. Choose the correct answer from the options given below:

Identify the correct statements regarding factors influencing development of a plant disease. A. Host nutrition often influences development of a disease in plant B. Many leaf diseases are favored by high level of nitrogen in soil C. Deficiency of potash in plants renders the tissue tolerance to water soaking D. High calcium decreases resistance to wilt and soft rot diseases E. Root diseases favoured by high temperature are often controlled by irrigation. Choose the correct answer from the options given below: